Tall Aster
Symphyotrichum praealtum
Last reviewed: August 2026
Tall Aster is a late-season forb with violet, yellow-centered blooms from August through October. It grows in full sun and medium to consistently moist soil, often along stream banks, wet meadows, and roadside ditches.
Toxicity unknown
Tall Aster (Symphyotrichum praealtum) is not listed by the ASPCA Animal Poison Control Center (opens in new tab) or the other sources we check, so we have no verdict for it either way. Absence from those lists is not a clearance. If your pet shows symptoms after eating any plant, call the ASPCA at (888) 426-4435.
Light
full sun
Water
medium
Size
24"–60" H × 12"–36" W
Bloom
Aug, Sep, Oct
Native to
AL, AR, CT, DE and 28 more states
Pollinators
bees, butterflies, moths
Before you buy
Your city may pay you to plant this
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Aromatic Aster is a tall native wildflower that produces masses of small white to pale purple flowers from late summer through fall. This robust perennial spreads to form colonies and provides excellent late-season color when many other plants are finishing their bloom cycle.
Growing Tall Aster
Grow Tall Aster in full sun and medium water. Mature plants reach 24 to 60 inches tall and spread 12 to 36 inches wide. Expect low maintenance to keep it looking intentional in a front yard.
In an HOA neighborhood
Tall Aster takes more care to keep looking intentional in a front yard. Maintenance level: low. Consider it for backyard or mid-zone beds rather than the street edge.
Works well in: backyard only.
- Can appear weedy and unkempt to conventional standards
- Tends to spread aggressively and may look wild
- Very tall growth may violate height restrictions
Wildlife value
The abundant flowers are crucial for late-season pollinators including native bees, butterflies, and moths preparing for winter. Seeds provide food for birds through fall and winter months.
Common questions
- When does Tall Aster bloom?
- Tall Aster flowers from August through October, providing color in gardens and meadows after most summer perennials have finished.
- What kind of light and soil moisture does Tall Aster need?
- This forb performs best in full sun with medium to consistently moist soil, though it tolerates brief dry spells once established.
- What pollinators visit Tall Aster?
- Bees, butterflies, and moths regularly visit the flowers for nectar and pollen, making it a useful late-season nectar source in pollinator plantings.
- What growing conditions suit Tall Aster in the landscape?
- It suits sunny borders, rain gardens, and low-lying areas that stay damp, since it naturally favors moist meadows, floodplains, and ditch margins.
- Is Tall Aster HOA-friendly?
- Tall Aster takes more care to look intentional in a front yard. Consider it for backyard or mid-zone beds rather than the street edge.
These answers were drafted with an AI model from this plant's data. Verify care details with a local expert.
Native range data from vouchered herbarium specimen records and regional native plant society lists. Pollinator and host plant associations compiled from GBIF, iNaturalist, and published ecological literature.
If something looks wrong
Common plant problems, and what to check first
These come up on almost any plant. Each guide lists the likely causes in the order they are worth ruling out, with one thing to check before you act on any of them, and links to the source it came from.
- It is dying right after planting
- Leaves turning yellow
- Wilting even though I watered it
- Brown crispy leaf tips
- Bugs on the plant
Ready to grow Tall Aster? Add it to your garden in Pollinator Patch to track it and get season-by-season care guidance.
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