Swamp Aster, Purple Stemmed Aster

Swamp Aster, Purple Stemmed Aster

Symphyotrichum puniceum

This upright perennial bears purple flowers in fall.

  • Purple flowers are produced in fall, providing colour through the bloom season.
  • Upright clump, reaching 1.25 m at maturity; divide every three to four years to maintain vigour.
  • Best in full sun to partial shade to full shade with moist, average, wet soil.
Size
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Plant Characteristics

Sunlight
Full sun, Partial shade, Shade
Soil Moisture
Moist, Average, Wet
Hardiness Zone
3 – 3
Mature Height (meters)
0.9 – 1.25
Mature Spread (meters)
0.3 – 0.4
Growth Rate
Fast
Flower Colour
Purple
Foliage Colour
Green
Bloom Time
Fall
Habit
Upright
Deer Resistant
Pollinator Friendly
Attracts Birds
Ontario Native
Landscape Uses
Mass planting, Rain garden, Accent
Growing & Maintenance Tips
Aster puniceus, commonly known as Swamp Aster, grows best in full to partial sun, in wet to moist conditions. Soil should consist of plenty of organic material to hold moisture. Drought conditions will cause this aster to go into early dormancy. Plant height and width vary depending on location and soil moisture. Naturally found in highly fertile, low-lying areas, along streams and ponds.
Notes
Native to Ontario The botanical name for Swamp Aster, Purple Stemmed Aster has been updated from Aster puniceus to Symphyotrichum puniceum.

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