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Mexican feather grass is a densely tufted, perennial tussock grass that grows up to 70cm tall. It flowers between October and December, and the feathery flower head is erect when young and weeping when mature. Each plant can produce huge numbers of rough-coated seeds, each with a tufted hair at the base.
Mexican feather grass prefers a dry, temperate climate. It is most likely to invade pastures, grasslands, grassy open woodlands, disturbed sites, road sides and waste areas. It can become dominant under continual heavy grazing pressure.
Mexican feather grass produces masses of viable seeds that last up to four years in the soil, and where present will easily out-compete pasture species. Because it is a low protein, high fibre grass that has no grazing value for livestock, this results in lost productivity for farmers. It also replaces native species in open and coastal areas.