Canadian Horseweed
Erigeron canadensis
An upright, herbaceous annual plant characterized by narrow, linear leaves and branched stems bearing numerous very small, white or pale pinkish flower heads with yellow centers.
- Light
- Full sun, requiring at least 6 to 8 hours of direct sunlight daily.
- Water
- Low watering needs. Highly drought-tolerant once established; water moderately only during prolonged dry spells.
- Growth
- Upright herbaceous annual growing from 1 to 6 feet tall with a slender, single stem that branches toward the top. Moderate to fast growth rate.
Care instructions
Thrives in full sun and well-draining soils. Highly resilient and adaptable, requiring minimal watering once established.
Growing details
Sunlight
Full sun, requiring at least 6 to 8 hours of direct sunlight daily.
Watering
Low watering needs. Highly drought-tolerant once established; water moderately only during prolonged dry spells.
Soil
Adaptable to various soil types including sandy, loamy, or clay soils, provided they are well-draining. Prefers a neutral to slightly acidic pH range of 6.0 to 7.0.
Hardiness zone
USDA Hardiness Zones 2 through 9
Growth habit
Upright herbaceous annual growing from 1 to 6 feet tall with a slender, single stem that branches toward the top. Moderate to fast growth rate.
Bloom season
Blooms from mid-summer to autumn, producing dense panicles of tiny, daisy-like flower heads with white ray florets and yellow disk florets.
Propagation
Propagates primarily by seeds, which are dispersed easily by wind.
Common pests & issues
Generally resistant to severe pests and diseases, though can occasionally be affected by powdery mildew or rust in overly damp conditions.
Similar species
Can be confused with other fleabanes (Erigeron species) or asters, but distinguished by its very narrow leaves and tall, densely branched inflorescences of extremely small flower heads.