A vermicompost bin is very useful for disposing of kitchen waste, but there are a few things you shouldn't add to a worm bin. In some cases, it's a sanitation issue. You don't want to add anything that will contaminate the vermicompost or cause bad odors. On the other hand, there are some items that worms just tend to avoid, most likely because they irritate them. Here's a quick list of items to avoid putting in your worm bin.
- Meat and bones (unless they have fully fermented in a Bokashi bucket first.)
- Dairy (unless it has fully fermented in a Bokashi bucket first.)
- Citrus rinds (A few are all right, but the acidity tends to irritate worms, and they avoid it.) Onion (See above.)
- Anything that is sprouting (Worms tend to avoid eating anything that still has a little life left in it. If your potato peels start sprouting, they won't eat them.)
- Pet feces (These can harbor harmful bacteria that will then be in your vermicompost.)