Asclepias tuberosa (Asclepiadaceae)
An extremely hardy, longlived perennial native to North America. The magnificent bright orange flowers are concentrated in compact clusters at the top of branching stems. The flowers produce a large quantity of nectar which attracts butterflies throughout the growing season. Requires a very well drained sandy or gravelly soil in full sun. Butterfly Weed may take up to two years to become established from seed.
Suggested Use: Rock gardens, roadsides, mass plantings, borders.
Miscellaneous: Produces a very deep taproot making transplanting difficult . The stem, when broken, does not produce the milky white sap characteristic of this plant family. Once established is very dependable.
Average Planting Success: 50%
Height: 1--- 2 feet
Germination: 30---90 days
Optimum Soil Temp. for Germination: 65°F--75°F
Sowing Depth: 1/16"
Blooming Period: June----September
Average Seeds Per Pound: 87,000
1 oz Covers: 272 sq.ft.
Seeding Rate: 10 lbs. per acre