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Asclepias speciosa (Showy Milkweed) - An erect stout perennial to 3 feet tall and spreading slowly by rhizomes to form an open clump. It has hairy broad oval gray green 5-inch-long leaves that are arranged in opposite pairs along the stem and topped in late spring through early summer with lightly fragrant large tight spherical clusters (umbels) of pale pinkish purple star shaped flowers that have reflexes calyces.
Plant out in the open in full sun in most any soil and irrigate only occasionally to very little once established - this is a drought tolerant plant and is very hardy in its deciduous state, tolerating winter temperatures well below zero and useful down to USDA zone 4. It is very showy in bloom and was long used by the indigenous native American peoples for medicinal purposes and as a food source (it is considered one of the least toxic of the milkweeds). It is a food and habitat plant for the Monarch Butterfly and the flowers are attractive to hummingbirds.
Asclepias speciosa is native through much of western North America and in California from northern central California to the borders with Nevada and Oregon, where is grows in open clearings in mixed-evergreen and Yellow Pine forests. The name for the genus was one that Carl Linnaeus ascribed after Asklepios, the Greek god of healing, for the many medicinal uses of milkweed plants. The specific epithet is the Latin word for "beautiful" or "showy" in reference to this plant's attractive flowers. Our plants from seed purchased from Seed Hunt and we thank Ginny Hunt for the use of the image of the plant on this page.
Information displayed on this page about Asclepias speciosa is based on our research conducted about this plant in our nursery library as well as from information provided by reliable online resources. We also include our own observations made about it as it has grown in the nursery gardens and other gardens visited, as well how the crops of this plant performed in the containers in our nursery field. We will also include comments received from others and welcome hearing from anyone who has information about this plant, particularly if it includes cultural information aiding others to better grow it.
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