Cowflock
Caltha palustris
Last reviewed: June 2026
Light
part shade
Water
high
Size
8"–24" H × 12"–24" W
Bloom
Apr, May, Jun
Native to
CT, DE, IA, IL and 26 more states
Pollinators
bees, flies, beetles
Marsh marigold is a cheerful spring wildflower that produces bright yellow buttercup-like blooms from April through June. This low-growing perennial thrives in consistently moist to wet soils and partial shade, making it perfect for rain gardens or boggy areas. The glossy heart-shaped leaves emerge early in spring and may go dormant during hot, dry summer periods.
In an HOA neighborhood
Cowflock 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.
- Goes completely dormant in summer leaving bare spots
- Requires consistently wet soil which may look swampy
- Wild wetland appearance doesn't suit formal landscapes
Wildlife value
The early spring flowers provide crucial nectar for bees, flies, and beetles when few other plants are blooming. Seeds may attract waterfowl and other wildlife in wetland settings.
Native range data from the USDA PLANTS Database and regional native plant society lists. Pollinator and host plant associations compiled from GBIF, iNaturalist, and published ecological literature.
Does Cowflock fit your yard? Open it in Pollinator Patch to check it against your sun, soil, and HOA-conscious filters.