Here is a two part tutorial on how to help out Monarch butterflies. Interesting procedure.

I wonder if this could be done with silkworms? I have a Peak Oil story series which needs to have access to silk, and is set in St Louis.

Raising Butterflies - Part 1

Raising Butterflies - Part 2

Also, a discussion on Milkweed varieties and other polinator friendly plants:
Balanced Butterfly Gardens