Batten Blooms
PL. —Eurybia divaricataBotanical illustration — drop image
Eurybia divaricata

White Wood Aster

SummerFall
4a–8bHardiness zone
Peak bloom windowZone 6b · frost-offset weeks
Winter
Not in bloom
Spring
Not in bloom
Summer
Peak bloom
Fall
In bloom
Peak bloom
In bloom
Background

Native from Maine to Alabama, white wood aster is one of the few asters that thrives in dry shade, spreading by rhizomes to form loose colonies of dark, wiry stems and heart-shaped leaves under trees where little else will bloom. Sprays of small, star-shaped white flowers with yellow-to-purple centers cover the plant from late summer into mid-fall.

It's genuinely vigorous in dry, average soil under shade — vigorous enough to spread further than wanted in an open, sparsely planted bed, so deadheading before seed sets or cutting back hard in late spring keeps a planting in check. Deer and drought both leave it unbothered.

Good companions
Hosta SieboldianaSiberian BuglossAstilbe Biternata
Care guide
SunPart shade to full shade
WaterLow to moderate; tolerates dry shade
SoilAverage to dry, well-drained
Spacing18–24 in
Height1–2 ft
Zone4a – 8b
Native RegionAL, CT, DE, GA, KY, ME, MD, MA, NH, NJ, NY, NC, OH, PA, RI, SC, TN, VT, VA, WV
Seasonal tasks
summer
cutCut plants back to about 6 in in late spring for a denser, more compact form.
fall
watchEnjoy sprays of small white flowers over dark, wiry stems in dry shade.
cutDeadhead spent flowers before seed disperses if self-seeding beyond the planting area isn't wanted.
Common problems

Powdery mildew

Symptoms

White or grey powdery coating on leaves — usually starting on older growth in humid conditions or when nights cool.

Treatment

Improve air circulation by thinning plants. Apply neem oil or potassium bicarbonate spray at first sign. Avoid overhead watering.