Butterfly Weed Treatment Plant butterfly weed in late spring after the soil warms. Tend not to expect it to bloom the primary year; flowering could just take 3 a long time. Blooms final about two months, from late spring until late summer. A. tuberosa This species is a good selection https://socialbaskets.com/story3933270/an-unbiased-view-of-is-butterfly-milkweed-a-perennial