Genus: Milkweed

Asclepias

Photo/Illustration: 
Steve Aitken
Milkweed (Asclepias)
ah-SKLEE-pee-us
Asclepiadaceae
Flowers of plants in this genus are produced in umbrel-like clusters with numerous small flower groups to 1 inch wide. The flowers are followed by green fruits that ripen to yellowish-brown and split open to reveal their seedy contents. The leaves are simple, narrow lance-shaped, or ovate.
Care:  Grow in fertile, well-drained soil in full sun. Some species like more water.
Propagation: 

Sow tender seeds at 61° to 64°F in later winter. Sow hardy seeds in a cold frame in early spring. Divide plants or take basal cuttings in spring.

Species, varieties and clutivars for genus Asclepias

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Butterfly weed
Asclepias tuberosa
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Butterflyweed
Asclepias tuberosa
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Red milkweed
Asclepias incarnata
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Sullivant's milkweed
Asclepias sullivantii
Problems: 

Under glass, watch for whiteflies and spider mites. Aphids and mealybugs can be a problem when flowering. In the southeast, rust and leaf spot are common.