Family

Asteraceae

Description

Blue wood aster (Symphyotrichum cordifolium) is a graceful native herbaceous perennial that forms loose colonies through short rhizomes, thriving in partially shaded woodland edges and open understory habitats. Its delicate, pale lavender-blue flowers appear in airy clusters, often catching soft autumn light and enlivening fading borders. This species is especially valued for its late bloom period, extending nectar resources for fall-flying bees, butterflies, and pollinating flies. Despite its soft appearance, it is remarkably tolerant of dry shade, poor soils, and urban conditions, making it a staple in naturalistic and ecologically informed plantings.

Native to eastern North America, S. cordifolium is widely distributed from the Great Lakes to the southeastern U.S., especially in mesic woods and rocky clearings. In cultivation, it is often left to mingle naturally, where its branching stems and heart-shaped basal leaves add softness and structure to mixed borders or woodland gardens.

Bloom Time

August to October