apples 2015 Lapsley's Orchard

By all these lovely tokens September days are here, with summer’s best of weather and autumn’s  best of cheer”

Helen Hunt Jackson

September is here with its splashes of goldenrods, Joe-pye and other late summer flower. Butterflies that migrate are having their last hurrah and late season caterpillars are ready to pupate. Fruit trees are loaded down with apples, and the air in the early morning may be scented by ripe wild grapes. This is a great time of year, still green, but showing signs of the autumn that will soon arrive.  Getting outside now has its own sets of rewards.

spider web on a foggy September morning 2017 Pamm Cooper photo II

Spider web on a foggy September morning

 

While moving rocks in a landscape, one had a small mud like structure stuck to the underside. This was the work of the female Eumenes fraternus potter wasps construct mud brood  that look like miniature jugs. After an egg is laid inside with a good supply of caterpillars or beetle larvae to feed the larva when it hatches, the female seals the hole. Since the female potter wasps do not defend their nest, you can check inside to see the food stores/larva or pupa.

potter wasp structure under rock

Potter wasp nest cell attached to a rock

Wildflowers in bloom now include cardinal flower, turtlehead and closed gentians, all of which can be found in damp soils, especially along banks of ponds and streams. They can be found under shrubs or among other plants growing in wet areas. Cardinal flowers are a good plant to stake out for the hummingbirds that love their nectar. Bumblebees can be seen squeezing their way into to the gentian and turtlehead flowers that most other bees do not have the muscle to get inside.

turtlehead

turtlehead along a pond bank

There are spectacular late season caterpillars, like sphinx and tussocks. Also the aptly named asteroid, which feeds on both aster and goldenrod flowers and flower buds.

Lapara bombycoides northern pine sphinx

Northern pine sphinx caterpillar

asteroid

The asteroid

I had to rescue an eft of the red spotted newt the other day. They sometimes come out of the woods after rainy days in warm weather, and this little fellow had come a few hundred yards away from the nearest wood line and was in the middle of a fairway being mowed. Disaster was averted, and the eft was brought to a wooded area near a vernal pool.

red-spotted newt eft going up

eft of the red- spotted newt

I returned to an area of woods off a hiking trail that has a number of nodding trillium, Trillium cernuum.  They now have the brilliant red berry that contains seeds, but you have to lift up the large leaves in order to them. This is one of my favorite trilliums, mostly because it is hard to find, and then the flowers are a reward for those who peek under the leaves to find them.

nodding trillium

nodding trillium berry

 

This summer has been warm and droughty after a fairly wet May and June, and even part of July. There has been flooding after the numerous rains where soils are heavy and do not drain well. Then days in the 90’s coupled with poor surface drainage caused turf grasses to die. Even grasses in a light soil may have had shallow roots going into the hot, dry spell, and some of that turf may have bought the farm as well. Yesterday we had only an inch and a half of rain, and yet flooding still occurred where soils were hard from drought conditions. Like Roseanne Roseannadanna used to say- “It‘s always something!”.

flooding

flooding after a rain

I will not especially miss this summer, with its extended heat and awful humidity. I intend to enjoy the cooler weather and especially the cooler nights. And may I never complain about the winter again. Like that will actually happen…

 

Pamm Cooper

tree frog on turtlehead flower

you never know what you may find…

 

 

 

 

 

 

 

 

 

 

This year I had the opportunity to work in the UConn Soil and Nutrient Analysis Laboratory during the ‘spring rush’. During this time the Soil lab can get up to hundreds of samples a day. These samples may come in one at a time from homeowners with established lawns or garden beds who are looking to maintain their plantings or from new homeowners who have never planted or cared for a landscape before, or dozens of samples from commercial landscapers on behalf of their clients, or from commercial growers.

For over 50 years farmers, greenhouse growers, and homeowners have been served by the UConn Soil Lab. With more than 14,000 samples coming in on an annual basis, that is a lot of soil! Soil fertility is the first building block of plant health. If a plant is not growing in soil that has the proper proportion of available nutrients then it will not grow as well as it could. Poor soil health leads to stressed plants with stunted growth and stressed plants are vulnerable to insect and disease issues.

Iron deficiency on buddleia

Buddleia with iron deficiency

There are a minimum of 16 elements that have been deemed necessary to vigorous plant health. In order by atomic weight they are: hydrogen, boron, carbon, nitrogen, oxygen, magnesium, phosphorus, sulfur, chlorine, potassium, calcium, manganese, iron, copper, zinc, and molybdenum. Some other elements that may not be used by all plants are sodium, silicon, vanadium, and cobalt. The big 3 are, of course, nitrogen, phosphorus, and potassium. Represented by their symbols from the periodic table as N-P-K, they are the prime ingredients in most fertilizers. The seedlings below show signs of nutrient deficiency and are in need of a weak solution of a balanced fertilizer.

 

Also essential to healthy plant growth is the pH of the soil. It won’t matter how much fertilizer is applied if the soil pH is not in the correct range for the host plant. pH stands for potential of Hydrogen and is represented by a scale that runs from 0-7 for acidic solutions and from 7-14 for the alkalis. The higher the concentration of hydrogen ions, the more acidic the sample is. All soil test results will recommend the addition of either limestone to raise the pH, sulfur to lower the pH, or no action required if the pH falls into the acceptable range for the plant/crop.

All standard nutrient analysis tests begin their journey in the same way. For each area to be tested one cup of soil is sent or brought to the lab along with the soil sample questionnaire. The standard test will provide soil pH, the macro and micro nutrients, the total estimated soil lead, and basic texture and organic matter content. Many homeowners and growers request additional tests or only require specific information in the form of textural analysis, organic matter content (measured by Joe in the images below), soluble salts, a pH only test, saturated media analysis (for soil-less potting media for greenhouses), or nitrate testing (for commercial growers).

 

This spring was very cool and wet, as we all know. Many samples were sent in later than usual and a good many were very much wetter than usual. It is important then that the first step requires that soils be spread onto paper toweling and allowed to dry.

1. Spread soils on drying rack

Once the soil has adequately dried out it must be sieved so that any rocks or bits of organic matter are removed. This step may also involve some pounding to break up any chunks of soil as shown by Skyley.

 

From there a small amount of each sample is placed in a paper cup by Louise to be tested for its pH. It is mixed into a slurry with a small amount of distilled water, the calibrated testing meter probe is placed in the mixture and the pH level is stored in the computer program for later retrieval.

 

In a manner similar to a coffee pour over, some of the soil is placed in filter paper that is resting in a test tube in preparation for the nutrient analysis. A Modified Morgan solution is the liquid used for this extraction method.

 

The nutrient analysis is done by a machine called the ICP which stands for Inductively Coupled Plasma. This machine would be right at home in Abby’s lab on NCIS! When I was in school back in the 70’s we were taught that matter existed in three states: solid, liquid, and gas. But matter has a fourth state and it is plasma. It doesn’t exist on Earth under normal conditions but we do witness it every time we see a lightning strike.  Plasma can be generated by using energy to ionize argon gas.

The plasma flame is hot. Really hot.  6000 Kelvin.  For some perspective, the surface of the sun is approximately 5,800 K.  The solution from the individual tube samples is passed through a nebulizer where it is changed to a mist that is introduced directly to the plasma flame. A spectrometer is then able to detect the elements that are present in the soil sample.

 

Additionally, the testing for phosphorus is done with this machine shown below, the Discreet Analyzer.

 

Some soil samples come from outside of CT and those may present a particular set of problems. The USDA has quarantines in several states to limit the spread of certain invasive insect pest species such as the imported fire ant, golden nematodes, and even a few plant species. For more information visit the Federal Domestic Soil Quarantines site.

Working at the UConn Soil Lab has been a great experience and quite an eye-opener. Who knew that there was so much behind a soil test?

Susan Pelton

All images by S. Pelton, 2108

snow and tree

As I sit here inside, watching the cold wind blow and snow pile up outside the warmth and safety of my little writing spot, I wonder just how all those living beings outside are surviving. Trees are swaying in the wind, and birds trying to visit the feeder are forced to alter flight plans while sporting ruffled feathers. The only animals I see are hunkered down squirrels. And just where did the insects go?

A little research tells me all of the annual plants are dead. They completed their life cycle in one year going from germinating a seed to producing seeds which are waiting winter out to make new plants in the spring. In my vegetable garden I call them volunteers. You know those tomato seeds that germinate from last year’s rotted tomato fruit that dropped to the ground and its seed volunteered to grow where I didn’t put this year’s crop. The seed survived through the winter, not the plant. Annual weeds drop seed in this manner, too.

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Perennial plants are a different story, although their seeds can do the same overwintering as annuals, the existing plant can live through the winter to grow another year, hopefully for many years more. Trees and shrubs are woody perennials that have woody above ground structures and roots that overwinter. Herbaceous perennials overwinter their roots and crowns only. The above ground portion of the plant dies back, but the crown and roots are alive at level or below ground. Perennial plants go dormant, living off of stored food until warmer weather returns. Storage organs of plants are the thick roots, rhizomes and bulbs. Just how they prepare themselves to make it through the winter happens at the cellular level long before freezing temperatures begin.

Plants are triggered by the amount of light and the amount of dark they experience, and lower night temperatures signal to get ready for winter rest and dormancy. Different species have varying light and temperature levels signals. Deciduous trees and shrubs must begin the process of losing their leaves by first stopping the production of their food. We notice it in slower growth and in the leaf color. The leaves are the food factory of the plant where photosynthesis happens. Carbohydrates are made then stored in roots and woody parts of the tree or shrub. Lots of light and water results in good growth and food storage, but when light amount lessens, leaves slow down production. Chlorophyll is also produced during photosynthesis, giving the leaf a green color. Once the leaves stop working, no more chlorophyll is produced and the other plant pigments of red and yellow are exposed now that there is no green chlorophyll to cover them. This is when we see beautiful fall foliage. The next change happens in a specialized layer of cells at the point where the leaf stem (petiole), attaches to the twig called the abscission layer. These cells enlarge and harden to choke off water flow to the leaves and the leaf slowly dies and falls off.

tree in fall

The next cellular change is called cold hardening. It happens within the vascular system containing the plant juices and water. If water inside the cells freeze, it will rupture the cells, permanently damaging the plant. The cold hardening process increases the sugar content of the water, and makes other protective chemicals, lowering the freezing level of the plant liquid. Basically the plant makes its own antifreeze. Cell walls are also changed to allow water leakage into spaces just outside the cell so if crystals do form, damage will be avoided. The acclimation of all these changes makes the plant able to tolerate below freezing temperatures. Fall pruning or fertilizing with nitrogen during August and September stimulates new growth interrupting the cold hardening process.

Evergreen trees and shrubs have thick leaves with waxy coatings to prevent moisture loss. Some broadleaved evergreens have gas exchange openings called stomata on the underside of the leaf. In very cold weather the leaves will curl as the stomata close to prevent moisture loss. Rhododendrons are a good example. Evergreen plants will continue to photosynthesize as long as there is moisture available, but much more slowly during the winter.

rhododendron curled in snow

Animals and insect have the ability to move, unlike plants. They can migrate, hibernate or adapt to winter’s cold. Certain birds migrate to warmer areas and better food sources. Hummingbirds, osprey, wood ducks and song birds fly south, and some birds from far north in Canada come south to spend the winter here. Juncos, snowy owls and bald eagles summer at a higher latitude and spend the winter nearer to us. They go where they can find food.

Some animals go into a winter dormancy or hibernation. This phase consists of greatly reduced activity, sleep or rest, and lower body temperatures while their bodies are sustained from stored fat. Bears, woodchucks, skunks, bats, snakes and turtles all have true hibernation, not waking until light levels increase and food sources begin to be available again. Bears and bats find caves, woodchucks, and skunks dig tunnels, snakes and some turtles burrow into soil and leaf litter, all in protected sites.

woodchuck at entrance to tunnel

Woodchuck at the entrance to his tunnel where he will spend the winter.

Other animals such as chipmunks have underground burrows lined with stored nuts and other food. Beavers do the same in lodges they build just above water, and line with stored logs to feed on during the winter. They sleep for long periods, only waking to eat and if maybe take a short walk above ground before returning to their den. Fur bearing animals will grow a thicker winter coat to help keep them warm, and may be a whiter color to provide camouflage in the snow.

Voles are active all through the year. In winter, they will tunnel through the snow, just on top of the ground looking for plants material to eat. They will strip the bark off of young trees and eat the roots. Voles store seeds and other plant matter in underground chambers. Mice are active and breed year round, living in any protected nook or cranny they can find, including our homes. They store food in hidden spots away from human and predator activity. Check for mice tracks around your foundation after a freshly fallen snow to see if mice are using your house for their winter quarters. Moles are active deep underground, below the frost line, in an elaborate array of tunnels. They feed on soil dwelling insects throughout the winter. I guess you could say they go ‘south’ in the soil profile during cold weather of winter.

Squirrels do not migrate nor hibernate, they adapt. They are active all winter, raiding bird feeders, and feeding on stored nuts. They grow a thicker coat of fur and fat for winter. Squirrels make great nests high in trees, well insulted with leaves. Several grey squirrels will share a nest to keep warm. They are often too quick to get a close up photo!

squirrel tail

Insects as a group are very large and diverse. Some migrate in their adult stage such as monarch butterflies and some species of dragonflies. Others overwinter in pupal stages like the chrysalis’ of spice bush swallowtails or cocoons of Cecropia moths.  Others adult and immature insects, depending on species, enter a state of diapause, similar to hibernation in animals, to overwinter during the winter. Diapause is a dormant semi-frozen state for some insects.  And like plants, changes at the cellular level occur, too. These insects produce an alcohol-like chemical and added sugars to the moisture in their bodies to prevent freezing, just like vodka will not freeze when placed in our home freezers. Insects will first seek out a protected place in the soil, leaf litter or under lose tree bark or rotten logs.

The brown and orange woolly bear caterpillar burrows into the forest floor to spend the winter as in its larval stage. In spring it will come out of its dormancy to pupate, later becoming an Isabella tiger moth.

woolly bear

Other insects lay eggs singly or in mass groupings, which are equipped to live through the winter and hatch when conditions are good again. Gypsy moths spend the winter as egg masses, tolerating down to -20 F temperatures. Crickets are another insect group which lays eggs in the fall on the ground that will provide a new generation of night songs for us to enjoy the next summer.

Gypsy moth egg cases, p.cooper photo

Gypsy moth egg mass will overwinter on this tree bark. Hatch will be in late spring.

-Carol Quish

tulips

 

 

 

cedar-waxwings-on-crabapple-photo-pamm-cooper

Cedar waxwings on a crab apple in winter

“He who marvels at the beauty of the world in summer will find equal cause for wonder and admiration in winter.”
-John Burroughs

 

Winter is a good time to get out and about as weather and gumption allow. Depending on where you go, there can be interesting things to see, and there no lack of books or other resources to help you learn about whatever you find. I like the shore and the woods in winter, especially on sunny days.

Ring-necked ducks can be found in small ponds or flooded fields during the winter. These small ducks dive to for mollusks, vegetation and invertebrates, and may be seen in small groups or in pairs. Males are more dapper than females, having a glossy dark head with a purple sheen, black chest and back and silvery sides. The bill is boldly patterned with a white ring near the dark tip and a base outlined with white.

male-ring-necked-duck

Male ring-necked duck

Another small duck that overwinters along the Connecticut coastline is the ruddy duck. They can be found in coastal estuaries and brackish rivers and streams near their entrances to the Sound. Males congregate in small to large in large flocks resting on the water during the day, heads tucked under a wing. Tails may jut nearly strait up and males have blue bills and a contrasting white cheek patch. More cute than handsome, they are also a diving duck.

Another bird that may overwinter here as long as food is available, is the red- breasted nuthatch. This cousin to the white-breasted is mainly found in coniferous woods or patches of pines, spruce, hemlocks or larches. They have black and white striped heads, slate-blue wings and back and reddish underparts. They sound similar to the white-breasted nuthatch, but their voice is more nasal and often more repetitive. They creep up and down trunks and branches probing bark for food, and may visit suet feeders.

red-breasted-nuthatch-in-februaryi-pamm-cooper-photo

Red breasted nuthatch

Winter is a great time to look for any bird’s nests that still remain in deciduous trees and shrubs. Baltimore oriole nests are probably the easiest to identify as they hang down from moderately high branch tips, and often are decorated with purple or orange ribbons. Birds are often very particular as to what materials they will use- dog or horse hair, lichens and mosses, grasses etc. Cattail or cottonwood down is a must for yellow warblers and American goldfinches. I am lucky to have found two ruby-throated hummingbird nests, tightly woven tiny cups constructed of spider webs with lichens decorating the sides.

birds-nest-in-fall-with-plastic-and-ribbon

Nest made of grapevine bark and colored trash- possibly a catbird nest

If you have bird house, especially for bluebirds, make sure to clean them out by early March, as bluebirds start staking out a suitable nesting sites early. They will use old woodpecker holes, high or low in the tree trunk, in the woods or on the wood line. Just be sure to have no perch below the nesting box hole as bluebirds like to cling to the hole while feeding their young and seldom use a house with a perch.

bluebird-on-box-pamm-cooper-photo

Male bluebird on nesting box

Fireflies have been out during the warmer, sunnier days of winter. Check out the sunny sides of tree trunks. Another insect that may be out on warm days is the Mourning Cloak butterfly. These butterflies overwinter in tree bark crevices, sheds, tree cavities or anywhere else they can escape winter winds and snows. They may be encountered flying around the woods on sunny, warm winter days.

fireflies-in-winter

Fireflies on a sunny tree trunk during January

mourning-cloak

Mourning cloak butterfly

Just before sunset, check out the surrounding trees for a characteristic orange glow. Caused by clear skies to our west and the scattering of blue light, houses and trees can reflect the bright winter oranges as you look toward the east. Lasting only a few minutes, if that, it is one of the winter highlights for me.

pre-sunset-winterr-glow

Pre-dusk winter glow

This winter, many paper wasp nests were unusually small. Not sure what to make of that, except maybe the wasps had a lack of food, or were out too late last January and were not able to acclimate properly to the sudden cold. As for snow, so far not much to speak of in my part of the state. But I’ll take the rain over the snow as long as the ground isn’t frozen. While snow can be pretty, I simply don’t miss this ….

winter-2010

Winter 2010

Pamm Cooper         all photos copyright 2017 Pamm Cooper

“Clouds are not spheres, mountains are not cones, coastlines are not circles, and bark is not smooth, nor does lightning travel in a straight line.”

– Benoit Mandelbrot, introduction to The Fractal Geometry of Nature

At this time of year many of the trees and shrubs in our landscapes are mere skeletons of their summer glory. Their beautiful canopies of leaves have been shed and they provide little visual interest. Unless you look a bit closer…

maple-tree

This is actually a great time to observe the branching patterns of deciduous trees. A closer look reveals that they are eerily similar to our own vascular and respiratory systems. As each system goes from the main trunk to the larger limbs to the smaller branches and then the twigs we see the same fractal branching that occurs in the network of blood vessels in our lungs. How incredible that such like systems are actually performing a reverse process. Trees are taking in our exhaled carbon dioxide and releasing oxygen (O2) into the atmosphere.  In turn, we inhale that O2 rich air into our lungs where it travels through the increasingly smaller vessels until it reaches the capillaries where it passes through into our bloodstream. As the oxygen-rich blood travels through our body our cells use the oxygen and release CO2 back into the bloodstream where it travels back to our lungs before releasing CO2 as we exhale.

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The important thing to remember is that for both of these systems to work well they need to cover a large surface area and fractal branching is the most efficient way for that happen. Fractal branching is a pattern that repeats itself in either larger or smaller scales, each step looking like a copy of the same overall shape. These patterns are called self-similar and are found in many areas in nature from trees to rivers and many more. Ferns are a great example of a self-similar fractal as each pinnate leaf is a miniature version of the larger frond that it branches off from although natural branching fractals do not go on infinitely as mathematical fractals can. Remember the Fibonacci Sequence from your high school math class?

japanese-painted-fern

Most of the fractals that we are familiar with and see on a regular basis fall into the category known as spiral fractals. Spiral fractals are responsible for some of the most beautiful forms that can be found in nature. Many galaxies are spiral fractals. The marine animal known as the Nautilus is perhaps one of the most well-known examples of the spiral fractal. But there are also so many spiral fractals that we encounter in the plant kingdom on a daily basis.

Ferns exhibit fractal properties in two ways. The uncurling of a new fiddlehead in the spring is a lovely example of a spiral fractal while a mature Japanese Painted fern (Athyrium niponicumn) pictured above shows the self-similar pattern of a branching fractal.

The Monkey Puzzle tree (Araucaria araucana)  has a most interesting growth pattern with each branch a continuing spiral of tough, scale-like leaves. Although native to Chile and Argentina, these images are of a specimen that is located on the Long Island campus of Hofstra University.

Closer to home are some plants that are in many of our gardens during the summer season. The compact spirals of Stonecrop, also known as Sedum, help to form the tight clusters of thick leaves that give it its distinguishing look. I always love the way that dew or rain collect in the in little cups that are formed.

Sunflowers (Helianthus annuus), Gerbera (Gerbera) daisies, and Coneflowers (Echinacea purpurea) show their spirals on a grand scale.

Decorative cabbage and kale (Brassica oleracea) are seasonal plants that bring their cold-resistant beauty to our fall landscaping and thus complete a full year of natural fractals that can be found all around us .

ornamental-cabbage-2

Susan Pelton

 

lime-bag-homedepot

Bag of Lime

Many Connecticut residents spread limestone on their garden beds and lawn as an annual ritual. Why do we do this? Some do it because their parents did it, or the guy at the garden center told them to and sold them the limestone. How much should be purchased and applied is another mystery to most. The real answers of limestone’s why, how much and when lies in the science of soil.

Soil is made up of sand, silt, and clay. The percentage of each of these three determine the soil’s texture, which will determine how the water will move through it, or hold on to moisture. More clay equals wetter soils; more sand, better drainage. The sand, silt and clay are tiny pieces of rock, broken off of bigger pieces over much time by weathering. The rocks that makes up much of Connecticut has a naturally low pH in the 4.5 to 5.5 range. Other areas of the country and world have different rocks with different pH ranges. Acid rain falling onto the ground lowers pH levels, as does the action of organic matter decomposing which produces organic acids. Even the normal function of respiration by plants mixing oxygen and water together produces carbonic acid in the soil. More acid equals lower pH. No wonder why we need to test, monitor and fight the natural tendency of our soil to stay in a low pH range.

Most plants we want to grow require a pH range of 6 to 7. This means we have to change the pH to grow plants like grass, tomatoes, peppers, squash or garlic by adding limestone which raises the pH level. The only plants consistently happy with our native range are native plants! They have evolved in the local soil. This is why blueberries, oak trees and mountain laurel fill our forests and wild areas. Pines are another tree preferring our lower pH.

Why do the grass and vegetables prefer the 6 to 7 pH range? Because more of the nutrients that these species of plants need are available when the soil pH is in that range. The easiest way to think of pH is it is a measurement of the amount of hydrogen ions in the soil. The more hydrogen ions, the more acidic the soil is. The pH of the soil affects the availability of all plant nutrients. Just as plants have ideal moisture and light requirements, they have a preferred pH range as well.

The pH range numbers 0 to 14. The middle is neutral at 7. Pure water has a pH of 7. 0 is acid or bitter; 14 is alkaline or sweet. Old time farmers used to taste the soil to determine if it was bitter (acid, low) or sweet (high, alkaline). I am glad we have pH meters and laboratory soil testing equipment now!

0_________________________________________7_____________________________________14 Acid (Bitter)                                                                           Neutral                                                                  Alkaline (Sweet)

Soil pH levels also affect other life in the soil such as insects, worms, fungi and bacteria. The soil is alive with more than just plants. It is an entire ecosystem sustaining many life forms all interacting with each other. The pH level is probably the most important place to start when trying to provide the best environment for whatever plants you are growing.

Have your soil tested for pH and nutrient levels at the UConn Soil Nutrient Laboratory www.soiltest.uconn.edu. Have the $12.00 basic test for Home Grounds and Landscapers done. Forms and directions are on the website. We will be offering free pH only tests at the CT Flower Show February 23-26, 2017. A half cup of soil is needed. If you don’t have snow covering your ground now, go gather some soil now and hold it until the show. Once you know the pH of your soil, we can tell you how much limestone to apply in the spring. Fall is the best time to put down lime as it needs about six months to fully react and change the soil pH. Never put limestone down on frozen or snow-covered soil to avoid it running off to areas you didn’t intend to lime, like the storm drain. Limestone will not soak into frozen soil.

ph-meter

pH Meter

-Carol Quish

Pile of earthworms. Urbanext.illinois.edu

The soils supporting our home lawns, vegetable and perennial gardens are improved by the presence and activity of earthworms. They are considered beneficial in the plant world. Earthworms move through the layers of soil creating tunnels for water and oxygen to reach the plant roots and channels for root growth. Their movement increases drainage and reduces compaction. Often called “nature’s rototillers”, earthworms feed on organic matter, bacteria, fungi and small soil particles in varying depths depositing their castings, or feces, in other horizons effectively turning the soil over. Castings are rich in nitrogen and nutrients easily absorbed by plants. Their feeding aids decomposition of organic matter, aerates soil, creates good soil structure and develops humus. The Rothamsted Experimental Station in England has done research finding as many as 250,000 earthworms per acre. That is a lot of subterranean work happening! Charles Darwin was one of the first scientists to recognize the benefits of earthworms. His last book written in 1882 is on the worm biology and behavior. His discoveries of earthworms are still being seen today.

Often after a rain, earthworms come to the soil surface then re-enter the ground head first. Some scientist think the worms come to surface for air if the ground is saturated. Others believe chemicals in the rain are inhospitable by changing pH and chemical amounts from acid rain. Still others think since the surface is moist, the worms come to the surface to mate. Earthworms are negatively affected by drying out by the sun therefore most surfacing happens at night. The action of tunneling back into the ground squeezes the worm leaving a pile of castings above ground. The casting look like tiny round balls piled up in a pyramid up to two inches depending on the size and type of the worm. Casting piles normally go unnoticed unless the turf is cut exceptionally short like that on golf course greens and tees. Home lawns should be cut to a height of at least three inches. Wet piles can stick to mowing equipment gumming up the blades and gears. The piles are easily dispersed once they dry.

Earthworms breathe through their skin. Oxygen is absorbed by mucous on the outside surface of the worm where it is transferred to the internal organs. This is called a gas exchange. The circulatory system of the earthworm contains five hearts or aortic arches. They pump fluids to blood vessels and capillary beds throughout the body circulating back to the hearts. The earthworm’s digestive system starts with its wide opening of a mouth that its throat or pharynx protrudes out of grabbing organic matter, soil particles and all that they contain. This food is swallowed down to a storage area called a crop. The food then moves to the gizzard where it is ground up by strong muscles and tiny stones and grit swallowed by the worm. Once the food is sufficiently ground, it moves to the intestines where digestive juices extract nutrients and some are absorbed by the worm. Excess digested food is then excreted as worm castings. It is these castings that are rich in nutrients readily available for plant roots to pick up. Earthworms don’t have eyes but are sensitive to light, vibration, touch and chemicals. They want to be in darkness and will move away from the light.

Chemicals added to lawn and garden can kill the earthworms. Preferred pH levels are neutral to 6.6. Adding lime in large doses can be too shocking of a change in their environment. Many earthworms will move to areas with better suited conditions or they may just die. Some insecticides and fungicides have lethal effects on earthworms. Researchers have also found earthworms within chemically treated soils to contain up to 20 times the toxin levels than the soil the worms inhabited. Stored toxins built up in the earthworms could then be passed up the food chain to animals using the earthworms as food.

Earthworms are classified as animal invertebrates. They are in the phylum group Annelida, meaning segmented worms.   Each segment contains four tiny setae or claw like bristles used to move through the soil.  Worms are hermaphroditic;  each worm has both male and female parts with the male pores located on the outside of the animal. Earthworms are not self fertile. They need another worm to mate and reproduce. Each worm is fertilized in the mating process called cross-fertilization.

The most common earthworms found in Connecticut are Lumbricus terrestris, called the Night Crawler, and Lumbricus rubellus called Red Worm. Night crawlers are known to venture deep into the soil in permanent vertical burrows. The will come to the surface to feed also. Red worms prefer to live in a manure pile or area with high organic matter. Both of these earthworms originated in Europe and were introduced to North America unknowingly on plant material, ship ballast, wheels and shoes of immigrants. Native earthworm finding are very rare. It is not known whether native types were wiped out by glaciers scraping the earth or if the new earthworm invaders displaced the old. Different theories exist. What is known is that the earthworms that are present today are many, active and busy decomposing and recycling organic matter in rich new topsoil.

There are some invasive worms originating from Asia that are causing problem in some areas of North America. They are such fast consumers of organic material they are changing the layers of soil and eliminating the forest floor called ‘duff’. Some birds nest in the duff areas to raise their young. Insects and animals that also reside and feed in the fast disappearing habitat are also finding it hard to live. The effect of the exotic worms in the local habitat really is upsetting the ecological balance. Some populations that depend on the areas the worms are ruining might vanish forever. Research is presently being done but much more needs to happen. So does education of the general public. Some fishermen are using invasive worms for bait, then just dumping the leftovers on the ground. They are unknowingly spread the invaders. ATV and off-road enthusiasts also can pick up soil, worms and eggs in tire treads, then depositing them far from the initial infected site. Hopefully in the not too far future, more information and education programs will be available. Keep watching!

-Carol Quish