Butterfly Weed Treatment Plant butterfly weed in late spring after the soil warms. Never hope it to bloom the 1st yr; flowering may acquire three decades. Blooms previous about two months, from late spring till late summer months. A. tuberosa The blossoms Within this plan supply nectar for Grownup butterflies, https://exploreyourgarden.site/are-milkweeds-perennials-or-annuals/