Information from the Perennial Plant Association website:
Hardiness USDA Zones 4 to 9
Light - Butterfly weed grows best in full sun.
Soil - Grows best in well-drained soils and it is drought tolerant.
Uses - Butterfly weed is a perfect selection for full-sun meadow or prairie gardens as well as formal to semi-formal urban gardens. Flower arrangers find the plants make long-lasting cut flowers.
Unique Qualities - Asclepias tuberosa are butterfly magnets. Flowers are a nectar source for many butterflies and leaves are a food source for the monarch butterfly caterpillars.
Maintenance - Butterfly weed is subject to no serious insect or disease problems. Deer usually avoid butterfly weed.