I saw some Tropical Milkweed at Home Depot the other day. Couldn't help but think that they probably have toxic systemic pesticides, so couldn't be used for any Monarch cats that show up. My milkweeds got clobbered by extreme cold this winter. Some have new growth, but it's gonna be a while before they can be used. And I don't know how many of the Tropical ones will be back. I need to check with one native plant nursery in another county...they don't use pesticides and I know they're trying to grow enough milkweeds!
