Reddit reviews Twelve Impossible Things Before Breakfast: Stories

I believe that this is one of the Bruce Coville collections - Oddly Enough, Odder Than Ever, or Oddest of All.

I think it's the first one, but don't quote me on that.

Edit: However, googling the word "Bolundeers" - which is the name of the story about the volunteers in the compost - I find that it's in the Nightmare's Dozen collection and also in Twelve Impossible Things Before Breakfast. I've read the latter, and own it, so that's more likely.