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Genus Asclepias (Milkweed, Silkweed)

Asclepias tuberosa Photo/Illustration: Steve Aitken

ah-SKLEE-pee-us

Common Name: Milkweed, Silkweed

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.
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.

Species, varieties and cultivars for genus Asclepias

Asclepias tuberosa
(Butterfly weed)

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Hardiness Zones:

Butterfly weed is a native perennial with flat-topped, orange or yellow flower clusters at the ends of its stems or in its leaf axils. From midsummer to autumn, it produces clusters of brightly colored flowers that attract insects, followed by fruit and showy seed. Plant in a border, meadow, butterfly garden, or wildflower garden.