Could you do onions, starting from the bulbs? I recently sprouted potatoes with children. Get some organic potatoes (regular ones are treated not to sprout), let them start to sprout. Chop them up with an eye or two on each piece and let them set a couple of days so the cut hardens off. Then plant. We planted them in cups, and almost all sprouted.

Have you checked out Kids Gardening? Their website is below.

If you want to do it, you can check out of the library the book "Worms Eat My Garbage" by Mary Appelhof. You could keep the bin in the garden, and the kids could put their after lunch scraps in for the worms. This would be a lesson on decomposition. The food scraps start to be decomposed by mold, bacteria and other microscopic critters, then the worms move in and eat up what's left. The bins do not smell unless they get too wet.

Susan

Not sure how cold it gets where you are, but if you think it would be too cold for worms, you could start the bin in the spring.