Plant types and subtypes: Perennials
Light Requirements: sun, part-sun, part-shade
Water Use: low
Soil Moisture: dry, moist
Soil Description: rich, average, loam, clay, sand
Bloom Time: July, August, September, October, November
Bloom Color: purple, lavender, blue
Leaf Color: gray-green
Hardiness Zone: 4, 5, 6, 7, 8
Additional Tags: attracts birds, colonizing, cottage garden plant, fall interest, naturalizing, stream margin plant
Pricing & Availability
Symphyotrichum cordifoliumAlso known as:
common blue wood aster,
blue wood aster
Aster cordifolius, Aster plumarius, Symphyotrichum sagittifolium
Although Symphyotrichum cordifolium is a tall growing aster (5' or more), its flowers are rather small. They form disks that usually do not exceed 1/2 inch in diameter. They can be pale-blue, almost white when they open, then darken with age to deeper shades of blue or purple. The centers are yellow to red. Blooms form dense rounded clusters, and are long-lived. The basal leaves are distinctively heart-shaped and gray-green.
Symphyotrichum cordifolium is easy to grow in rich to average soil. It has low water requirements, though it can sometimes be found along streams. Good air circulation is important to avoid powdery mildew and other fungal diseases, specifically if planted in a moist environment. Performs beautifully in full sun, and also tolerates open shade. This species is very versatile and can be grown in open shade gardens, cottage gardens, as well as along water features. Pinching back the stems early in the season will encourage a denser appearance and a higher flower production. I self seeds readily to form colonies. Unwanted spread can be controlled by deadheading spent flowers before they go to seed. A late season bloomer with extended bloom time; as early as July, and lasting until November or first frost. Zones 4-8
Propagate from seed.
Plants might require staking if their height is not controlled, particularly when grown in the shade. Symphyotrichum cordifolium was the earliest aster in the Americas to be described, with references dating as far back as the early 1600's.
Native Range & Classification
Recorded County Distribution: USDA data
AL, AR, CT, DC, DE, FL, GA, IA, IL, IN, KS, KY, MA, MD, ME, MI, MN, MO, MS, NC, NE, NH, NJ, NY, OH, PA, RI, SC, SD, TN, VA, VT, WI, WV
|Species||Symphyotrichum cordifolium||common blue wood aster|