Swamp sunflower
Helianthus angustifolius
Swamp sunflower is a vigorous native perennial that produces masses of bright yellow daisy-like flowers in fall, providing an important late-season nectar source for pollinators and seeds for birds. It thrives in moist to wet soils and full sun to part shade, making it excellent for rain gardens, pond edges, or low-lying spots in the landscape. Plants can spread over time to form attractive colonies, so give them room to naturalize.
Toxicity Warning
Known to be toxic to dogs, cats, horses.
Care Level
Low
Sun
Partial Shade
Water
Moderate
Growth Rate
Moderate
Mature Height
120″ – 360″
Soil
loam
Life Cycle
Perennial
Spacing
24″
Flowers
yellow
Watering Schedule
Every 7-10 Days; More Frequently In Hot Dry Spells • Water Deeply To Keep Soil Consistently Moist; Tolerates Brief Wet Periods
Soil pH
4 – 7
Temperature
-25° – 95°F
Mature Spread
up to 180″
Root Depth
Medium
Foliage
Medium
Propagation: Seed
Native to
Attracts
Sources
Data: trefle, usda, aspca
Image: trefle.io — Taken Oct 6, 2022 by Alex Arriaza (cc-by-sa)
No nurseries currently have this species in stock.