Edmonton Master Composter Recycler Program Lesson Four: Vermicomposting

Vermicomposting or worm composting is one of the easiest ways of ridding yourself of those kitchen scraps without sending them to the Edmonton Waste Management Facility.

I read Worms Eat My Garbage by Mary Appelhof many years ago when I began my first worm bin while living in an apartment in Winnipeg. I didn’t have any place to compost on a large scale, so vermicomposting was my solution to reducing my waste.

I discovered that worms were voracious eaters and could multiply at a rate that would put rabbits to shame. My Rubbermaid bin of worms could go through almost four litres of kitchen waste per week.

Worm bin

Worm bin

Starting your own worm bin is an easy task.

What do you need?
A non-biodegradable bin that can be drilled with holes.
A lid for the bin.
Bedding material such as shredded newspaper or leaves, corncobs, or paper towels.
Food waste
Worms: usually red wigglers because they like shallow depth

Your bin should be about five times the size of your weekly volume of waste. A microwave size bin will handle an ice cream pail full of waste.

Begin by filling the bin with bedding material. Soak this with water for a few minutes and drain off the excess. Add some starting microbes by adding soil or compost. Add your food waste, burying it below the bedding. Add a handful of worms. It will take the worms three months to multiply to their maximum number, so initially be careful not to over feed them.

Feed them: vegetable scraps, tea bags, tea leaves, coffee grounds, dried out and crushed egg shells, fruit and fruit peelings, grains and nuts.

Don’t feed them: lots of fresh discards, meat and dairy, oily or salty foods, lots of one thing, quantities of yard waste, chemically treated items, non-biodegradable items, cat, dog or human feces.

Red wigglers

Red wigglers

To harvest worm castings you can use:
1. The side-to-side method. Simply move the old bedding to one side of your bin and add fresh material on the other. The worms will migrate to the new food source and you can harvest the completed material.
2. Bright light and scoop method. Shine a bright lamp on your bin and scoop castings from the top as the worms scurry for darkness.
3. The Sun-dried Method: Make piles of compost outside in the bright sunlight. The worms will work their way down to the bottom of the pile.

Castings can be used in potting soil (25% by volume), as a top dressing for perennials and annuals, or as a starter mix for seedlings (add an inch to the bottom of a transplant hole or seed row).

Special thanks to this weeks special instructors:
Christine Werk, MCR 2010
Hannah Heaton, MCR 2012

7 thoughts on “Edmonton Master Composter Recycler Program Lesson Four: Vermicomposting

  1. ian says:

    I have a 46 l trash can that I have been throwing kitchen waste into. If I add a bag of worms would it speed up the process?

    • Worms need to be cared for, keeping the correct moisture level.Tthey need to be in a container that is wider than it is deep. Try reading the book, “Worms Eat my Garbage” by Mary Appelhof. Lots of great info there.

      • Arv says:

        Greetings Gardening Grrl, Are you able to share a handful of red wigglers? I have been vermicomposting for years and recently moved to this wonderful city and can’t wait to start composting/vermicomposting again.


    • I collect compost all winter long, but the compost pile isn’t warm enough to be active. I dump my kitchen scraps in the bin, add an equal amount of leaves from a bag I have nearby. In the spring all that good stuff heats up and starts to compost.

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