Spreading aster is a native herbaceous perennial in the Asteraceae (daisy) family. It is found in rocky or sandy open woods and thickets. It has graceful arching stems that reach 2 to 3 feet tall and 2 feet wide. Showy, fragrant blue-purple blooms appear in August and last through October, blooming after most asters are finished and providing late season nectar to pollinators. While it prefers full sun, it does tolerate some shade. Plant in medium to dry well-drained sandy soil. Use it in the front of a border along a woodland edge, or mass plant in a cottage, or rock garden. Nectar from the flowers attract butterflies and bees making it an excellent addition to a pollinator garden. Its high drought and salt tolerance make spreading aster welcome in any coastal garden. Insects, Diseases, and Other Plant Problems: No serious insect or disease problems. Asters can have some susceptibility to powdery mildew and aster wilt. Poorly-drained clay soils and poor air circulation can contribute to this. Improving drainage and good air circulation helps reduce the incidence of foliar diseases. VIDEO: Part of the Native Plant Picks series from the North Carolina Sea Grant led Coastal Landscapes Initiative . More information on Symphyotrichum .
Source: NC State Extension Gardener Plant Toolbox ↗Reconciled to full toolbox: matched by slug to slug 'symphyotrichum-patens'. Identity (id/common/scientific name) preserved from the original 87-plant Hunnicutt set; attribute data refreshed from the 56-attribute toolbox scrape.
Curated pairwise relationships between this plant and others in the library — who feeds
whom, who competes, who confuses the pests. Green reads as a good pairing, red as one to avoid.
No curated interactions recorded for this species yet.
Also noted by NC State
Related species the NC State Plant Toolbox flags for this plant — look-alikes to tell
apart, and plants that play a similar role in a planting. Ones we carry in the library are linked.
Full sun (6 or more hours of direct sunlight a day) | Partial Shade (Direct sunlight only part of the day, 2-6 hours)
Soil texture
Sand; Shallow Rocky
Soil drainage
Good Drainage | Moist | Occasionally Dry | Very Dry
Available space
12 inches-3 feet
NC region
Coastal; Mountains; Piedmont
Mature size
Height: 2 ft. 0 in. - 3 ft. 0 in. | Width: 1 ft. 6 in. - 2 ft. 0 in.
Growth rate
Medium
Maintenance
Low
Canopy layer
4 - Herbaceous (3-15 ft)
Form & Appearance
Habit / form
Arching; Erect
Texture
Coarse
Leaf color
Black; Green
Leaf type
Simple
Leaf arrangement
Alternate
Leaf shape
Lanceolate; Oblong
Leaf margin
Crenate; Dentate; Entire
Leaf size
1-3 inches long, < 1 inch wide
Hairs present
Yes
Leaf detail
Simple, alternatate, lanceolate to oblong, entire to slightly toothed or wavy, hairy. Veins visible on the undersurface. Leaf base is attached to the stem without having a stalk or peduncle (sessile).
Flower color
Blue; Purple/Lavender
Flower value
Showy
Flower form
Head; Solitary
Flower shape
Saucer
Flower size
< 1 inch
Flower detail
Blue to violet oblong-ovate rays with disk yellow centers on solitary heads or terminal clusters.
Bloom time
Fall; Summer
Fruit color
Brown/Copper; Purple/Lavender
Fruit type
Achene
Fruit size
< 1 inch long
Fruit detail
Purplish brown ribbed achene somewhat hairy
Stem color
Brown/Copper; Green
Stem detail
Erect, or ascending covered in short curved hairs, they are britle and break easily.
Wildlife & Ecology
Native status
Native
Origin
Southeast USA
Wildlife value
Nectar attracts butterflies. Members of the genus Symphyotrichum support the following specialized bees: Andrena (Callandrena s.l.) asteris, Andrena (Callandrena s.l.) asteroides, Andrena (Cnemidandrena) hirticincta, Andrena (Cnemidandrena) nubecula, Andrena (Callandrena s.l.) placata, Andrena (Callandrena s.l.) simplex, and Colletes simulans.
Attracts
Bees; Butterflies
Food & Medicine
Fruit type
Achene
Landscape Use
Landscape location
Coastal; Woodland
Landscape theme
Cottage Garden; Native Garden; Pollinator Garden; Rock Garden
Design feature
Accent; Border; Mass Planting
Garden tags
#showy flowers #highly beneficial coastal plants #low maintenance #fall interest #cottage garden #nectar plant #fall flowers #NC native #rock garden #dry soils tolerant #butterfly friendly #nectar plant early fall #flowers mid-fall #pollinator plant #native perennial #border front #nectar plant late summer #flowers early fall #flowers late summer #specialized bees #hairy leaves #mass planting #purple flowers #perennial #wildlife friendly #coastal plant #woodland #moth friendly #nectar plant mid-fall