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Hype about worms destroying old-growth forests and reality about red wigglers

11/7/2016

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From the blog archive; originally published on December 24, 2009

I receive many questions about compost worms escaping from the worm bin to destroy forests. If you read the story, it relates to worms introduced by fishermen dumping their bait in the forested areas around lakes.

The fact is: earthworms can harm some environments. In nature nothing is as simple as all good or all bad. The earthworm's ability to tunnel through the soil and make passageways for air and water, to decompose organic material and release its nutrients, and essentially "till" the soil is good news for farmers and gardeners. They are actively growing crops that are continually replanted, and where the soil is continually amended with other nutrients (compost or mulch). Earthworms essentially prepare the soil for us. Here the presence of a lot of worms is good.

On the other hand, in forest ecosystems an overabundance of earthworms rapidly decompose the spongy layer of leaves and plant matter that makes up the forest floor and it is consumed faster than it is replaced by falling leaves and other decay. This 'duff' layer is essential to understory development (tree seedlings, wildflowers, ferns, etc.). Without the duff layer, invasive plants have an opportunity to gain a foothold. Here an overabundance of worms can result in harm.

The underlying (no pun intended) problem is that earthworms are not native to most northern parts of the country, including New England. Earthworms in this area were killed during the ice age. The earthworms in your garden are species from Europe that may have arrived with the Colonists (in soil used as ship ballast or with plants) or gardeners spreading compost or mulch from away.

I am not concerned about my red wigglers. Although I recognize they are non-native, they are not hardy in northern climes and probably won't survive our long Maine winter without a source of heat (hot compost pile). Here in Scarborough, my worms would have to cross Route 1 and the Maine Turnpike to reach an old growth forest (http://www.primalnature.org/ogeast/me.pdf).

Nevertheless, we should use good worm management to limit the potential for a problem. If you live in an area that abuts old growth forest, you should locate your outdoor compost pile and garden away from the woods. The University of Minnesota, which has been a leader in researching and spreading awareness of the problem, has some recommendations (and lots of helpful info) in their Great Lakes Worm Watch.

Merry Christmas!

Mark

Originally published on December 24, 2009
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What's in your worm bin?

11/7/2016

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From the blog archive; originally published on November 9, 2009
You may think you have mostly worms in your bin, but you’d be wrong. In fact, your bin is a very complex and diverse ecosystem. You have hundreds of species of organisms working in harmony to turn your food waste into beautiful compost. Your red worms are only a very small population of the other micro- and macro- organisms that inhabit your bin.

Sometimes new users write me with concerns when they notice some populations that bloom in number. Often they fear these organisms will flee the bin and harm houseplants or become a pest in their home. No need to worry. These organisms are happy in your bin where they have food and darkness. They are decomposers, so they do not harm houseplants.

What is really interesting is that these species have slightly different environmental preferences and food requirements. This means that depending on the conditions in your bin and what you are feeding, you may have some population blooms of these other species. For example, if you place a lot of sugary fruit in your bin, you will see mites bloom followed by an increase in the number of springtails. When their food supply weans they will die off.

Bacteria
Bacteria are by far the most numerous organisms in the vermicompost system. They break down organic matter to make it available to earthworms and other organisms in the bin. Remember, your worms don’t eat the food you put in, but the rot that is on the food. Bacteria are essential to your worm bin, just as they are in outdoor soil.

Mold & Fungi
In addition to the bacteria, mold and fungi are busy decomposing the organic matter in your worm bin. They are also an additional food source to other organisms in the system, including earthworms. Because they can grow big enough to be seen, these can be a sign that you have more food than the system can quickly manage and the feeding rate should be decreased. Mold and fungi pose no threat to the garden or the animals living in the worm bin, but overgrowth of these can cause irritation to humans with mold allergies. To keep them under control, feed in small amounts and when you see an overgrowth of these hold back on feeding.

Mites
Mites (reddish brown specks about as large as a typed period) are commonly found on the surface of the bin (if your bin is light colored, you can often see them on the sides near the soil). Mite populations will bloom when you have wet, sugary foods (fruit) in your bin.

Springtails
Springtail are an insect (white or tan) that can be seen fairly easily on the surface of the soil. They are beneficial in the system and have no interest in living plant tissue. Some texts claim that more than 80% of the organic matter on earth passes through the gut of a springtail or sow bug on its journey to becoming topsoil. They are most noticeable after a bloom in the mite population or in nearly finished compost.

Potworms
Sometimes mistaken for young red worms, these are very small white worms. They too are beneficial organisms that feed on decaying organic matter. Potworms are more common when your worm bin is on the acidic side, but they do not necessarily mean that you have a problem. You will see them after adding a lot of citrus.

Tips for keeping your bin running smoothly
Remember: the food waste you add to you worm bin today isn’t eaten by the worms until the other actors in your bin have done their job. Bury your food (adding the amount appropriate to the number of worms in your bin) to bring these organisms in contact with your food to get the process started and next time you have a moment, take a close look at your ecosystem. You may be surprised at the complexity of the system you are maintaining.

As always, your senses should be your guide to vermicomposting. What do you see, smell and feel in your bin?

Cheers,
Mark

Originally published on November 9, 2009
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Are you wondering what to buy for Christmas?

11/7/2016

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From the blog archive; originally published on November 25, 2009
A worm bin and pound of worms make a great Christmas gift.

I am not alone in this idea। I had someone come by my booth at Common Ground who told me that a worm bin and pound of worms the hot item at Yankee swap. Also, several people purchased worms and a bin from me this year as gifts for mom.

Worm bins need not be expensive or complicated. I think a simple bin is really a lot easier to use (and certainly easier to build!).

In my mind, the perfect gift would be a book on vermicomposting (like Mary Appelhof's book, Worms Eat My Garbage: How to Set Up and Maintain a Worm Composting System), a pound of worms and a new bin.

If you are already vermicomposting, you can provide the worms and make the bin. If you're an experienced vermicomposter, you can provide a vermi-consultation and skip the book. The more people we have vermicomposting the better.

If you are looking for other gift ideas, I recently created Amazon lists of my recommended vermicomposting supplies, as well as favorite garden tools and books.

You can view at:
  • WormMainea vermicomposting tools and supplies
  • WormMainea gardening tools and book recommendations

Happy Holidays!
Mark

Originally published on November 25, 2009
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    Mark Follansbee

    Vermicomposting and beyond! Check out what I've been up to on my blog.

    Please note that I'm migrating my blog from its original site. I'll be reposting previous entries until the move is complete. Click here to visit the full Blog Archive.


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