Frost Aster

Symphyotrichum pilosum, commonly known as frost aster (hairy stems appear to be covered with thick frost), is an herbaceous perennial in the aster family that typically grows to 4’ tall and as wide on one or more leafy, sometimes-branching stems. It is native to upland prairies, weedy meadows, pastures, open woodlands, limestone glades, abandoned/old fields, railroad right of ways, roadsides and waste ground from Quebec and Ontario south to Texas and Florida.

Flowers in branching clusters bloom from summer to fall. Each flower features 15-35 white rays which surround a yellow center disc. Discs turn reddish-purple with age. Flowers are followed by a fruit (dry seed with a tuft of white hairs). 

Best growth typically occurs in moist, semi-shaded woodland areas. Tolerates full sun in cool summer climates, but appreciates some part shade in climates where summer temperatures consistently exceed 90 degrees F. Tolerates periodic flooding. Stems may be pinched back in late spring to early summer if shorter plants are desired. Plants can spread aggressively by self-seeding.