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

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

Really that is determined by what works for you in the space you have.

You can buy manufactured bins online or in progressive stores, but I suggest you save your money and make one yourself!

When I respond to this question, I offer the following suggestions and considerations:

Red wigglers don’t typically dig more than 8” deep into a worm bin, so a really deep bin does not work as well as a shallower bin. You want to have the worms all the way at the bottom of the bin to keep conditions aerobic.

Really large bins (30 or 50 gallon size) can be used for worm bins, but they are VERY heavy when full of worms and vermicompost. If you’re planning to move your bin (e.g., take it outside to harvest using the sun), consider a series of smaller bins. If you're not going to move it, these large bins can certainly work.

Small bins can also work. Some people have shoebox size bins they keep under the kitchen sink. This can work, however, you must closely monitor conditions in your bin and be careful what you feed them. In a small bin the worms have nowhere to escape if the conditions become unhealthy. A friend had a wonderful bin until a bunch of limes were added in a layer to the bin after a Cinco de Mayo party. Soil pH dropped and all the worms died. This is also why I recommend you feed in the corners when you are starting.

I find the standard 18-gallon plastic storage totes work well for me. They are reasonably sized to allow the worms to flee from any bad things you may add, they are not too when full, they don’t take up too much space in the room, and they can be stacked. Click here for instructions to build your own bin.

The size and style of your worm bin is not important. If it works for you then it is best. The most important thing is that you get started with a worm bin.

Cheers,
Mark

Originally published on October 6, 2009

I realize that some of you who purchased in the fall processed last weekend when temps in Maine were spring-like. My garden is still under about 2 feet of snow. Many contacted me to ask: what do I do with 15+ gallons of worm castings in March?

Worm castings can be stored in a container like a worm bin. Keep them moist and let the castings breathe (remember that the castings are alive!). You don't want to let the casting dry out if you're going to make great tea (active organisms plus nutrients). Most recipes for tea call for about a pound of castings in 5 gallons of water (dilute to 10 gallons to use).

Castings stored this way will keep for several months-- just in time for real spring! In the interim, use what you have to make tea for your houseplants or soil amendments for seed starters. Just remember that your vermicompost may be full of viable seeds!

Tip of the hat to Bruce Deuley for his valuable contributions to the procedure. You can get the brewed vermicompost tea directions here.

Cheers,
Mark

Originally published on March 14, 2009

I've posted new worm bin instructions.

I have posted new instructions for making a worm bin. Earlier this year, I had an accident when drilling in the side of bins, and I am now recommending you make holes in the top of your bins.

I was drilling holes in the side and the drill slipped off the plastic and hit me in the leg. Fortunately, I was wearing pants and I didn't hurt myself.

This scared me and made me think. Why drill holes in the sides?

The worms don't care where the holes are, and the sides are sloped and flex when you try to drill the holes (both of which make it harder than it needs to be).

Holes in the nice flat top would be so much easier. So I tried it and viola! Works just as well and it is much easier.

My revised worm bin instructions are on the Your Bin page.

Cheers,
Mark

Originally published on November 21, 2008