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Hardiness: USDA Zone 5a: to -28.8 °C (-20 °F) USDA Zone 5b: to -26.1 °C (-15 °F) USDA Zone 6a: to -23.3 °C (-10 °F) USDA Zone 6b: to -20.5 °C (-5 °F) USDA Zone 7a: to -17.7 °C (0 °F) USDA Zone 7b: to -14.9 °C (5 °F) USDA Zone 8a: to -12.2 °C (10 °F) USDA Zone 8b: to -9.4 °C (15 °F) USDA Zone 9a: to -6.6 °C (20 °F) USDA Zone 9b: to -3.8 °C (25 °F)
I bought this plant from a local nursery and planted it on a retaining wall terrace where it gets full sun, which I assumed would be ideal since it is a prairie species. It is, but this summer I discovered a seedling that planted itself in a shady location where I had placed some of the abundant seed capsules last fall when I cut the plant back late in the season. I have also found tiny seedlings growing near my garden shed where there is essentially no sun. It's a native species that appears very adaptable. I'll see how the plants in the shady sites do next year and let you know.
On Jan 28, 2009, JonthanJ from Logansport, IN wrote:
When I noticed over the summer of 2008 that there were a dozen seedlings coming up through the grassy weeds within 20' of one that I had collected some years ago, on a south-facing clay loam hillside in one of my gardens, I got a bit antsy that it might be an invasive alien. It turns out that this is a native plant. Prairie Nursery suggests that it does well in clayey soils. It can be a chore to clean up the dead stems.
On Feb 3, 2006, srczak from Minneapolis, MN (Zone 4b) wrote:
I like the texture of the pinnate leaves; the flowers are showy enough, maybe not outstanding. Easy to grow in fairly sunny spot, tho withstands some shade and fairly drought tolerant. It's a nitrogen-fixing legume, so seed is easily harvested from pods after they mature and dry on the plant in late summer/fall.
This plant has been said to grow in the following regions:
Fayetteville, Arkansas Albion, Indiana Logansport, Indiana Council Bluffs, Iowa Sheffield, Massachusetts Afton, Minnesota Golden Valley, Minnesota Lincoln, Nebraska (2 reports) Ramblewood, New Jersey Oklahoma City, Oklahoma Coopersburg, Pennsylvania Memphis, Tennessee Austin, Texas Jacksonville, Texas Kalama, Washington