The Xerces Society's
Biota of North America Program
Lots of great reading and resources here:
Access PDF for Milkweed: A Conservation Practioners Guide here:
Methods of Propagating Milkweeds
Milkweed - it's what's for dinner . . .
. . . for a monarch caterpillar.
This map (from the link below) shows approximate ecoregions best suited for milkweeds. Identify your area's number and cross reference it to the listing for native milkweeds.
North Carolina vendors of milkweed:
USFS publication: Monarchs and milkweeds: The current situation and methods for propagating milkweeds
by Tara Luna & R. Kasten Dumroese.
Monarch Waystations = Gardens with Milkweed
See "Local Resources" for additional vendors in Asheville area that carry Asclepias at various times of the year.