milkweed, butterfly weed
Plants of Home and Garden
Seed best started indoors, or in some other protected location, 55-75F/ 13-24C, 1/16" deep. May benefit from 3-4 weeks' stratification in fridge prior to sowing. Rich, well-drained soil and full sun; often tolerant of hot and dry conditions. May be carefully divided in spring.
Asclepias incarnata, a perennial hardy to zone 3-8, is often grown as an annual, outside. Asclepias tuberosa, butterfly weed, may also be grown from bare-root specimens, in spring, and may be grown in containers year-round; these should be placed outside during active growth. Hardy zone 3-9
Asclepias curassavica (bloodflower, scarlet milkweed, Mexican butterfly weed)
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