Read about the migration here.
Our milkweed plants are still in dormancy, here in central Virginia. Milkweed is the only host plant for monarch caterpillars, so if you want to attract the butterflies to your yard, be sure to plant some. ButterflyBushes.com is a good source.
All Is Quiet on the Butterfly Front
Garden Notes: Late February
If You Plant It, They Will Come