Eragrostis in general produce floaty masses of flowers, but some are not reliably perennial. E. spectabilis (Purple Love Grass) is a perennial, with leaves to 30cm, green in summer turning reddish in autumn before dying down. The flower plumes go to 40 cm and make a reddish-purple cloud of spikelets in late summer, the whole thing becoming tumbleweed if you let it. Full sun, drought tolerant (or not according to what you read), naturally growing on poor sandy soils. Good component for prairie planting.
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