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Fine, needle-like green foliage forms a compact, vigorous mound. In late summer to fall it's virtually covered in spritzes of violet, crinkled blooms loved by butterflies and hummingbirds. "George W. Letterman, aged 72, a recluse and botanist, died in poverty and attended only by a neighbor in his little cabin at Allenton, thirty...

Dense, fluffy, magenta-purple flowers bloom mid-summer to late summer. It does self-sow, so remove flower heads before seeds develop if you want to limit its territory. Native to moist open areas of the Midwest, it tolerates periodic flooding. The more moist the soil, the taller the plant. Mature size: 4 feet...