Sky Blue Aster, Azure Aster

Sky Blue Aster, Azure Aster

Symphyotrichum oolentangiense

This upright perennial bears blue flowers in fall.

  • Blue flowers are produced in fall, providing colour through the bloom season.
  • Upright clump, reaching 80 cm at maturity; divide every three to four years to maintain vigour.
  • Best in full sun to partial shade to full shade with moist, average, dry, well-drained soil.
Size
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Plant Characteristics

Sunlight
Full sun, Partial shade, Shade
Soil Moisture
Well-drained, Moist, Dry, Average
Drought Tolerant
✓
Hardiness Zone
3 – 3
Mature Height (meters)
0.6 – 0.8
Mature Spread (meters)
0.3 – 0.6
Growth Rate
Medium
Flower Colour
Blue
Foliage Colour
Green
Bloom Time
Fall
Habit
Upright
Deer Resistant
✓
Pollinator Friendly
✓
Attracts Birds
✓
Ontario Native
✓
Landscape Uses
Mass planting, Accent, Border
Growing & Maintenance Tips
Plant in average, dry to moist, well-drained soil in full sun. Plant height can vary depending on how rich the soil is and how much moisture is provided. Pinch back 1/3 of the foliage twice before early summer, to maintain shape and foliage vigour.
Notes
Native to Ontario The botanical name for Sky Blue Aster, Azure Aster has been updated from Aster oolentangiensis to Symphyotrichum oolentangiense.

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