American Cow-parsnip
Heracleum lanatum
Last reviewed: July 2026
Light
part sun
Water
medium
Size
36"–96" H × 24"–48" W
Bloom
Jun, Jul, Aug
Native to
AL, AR, CA, CO and 38 more states
Pollinators
bees, beetles, flies
Browse plants for this ecoregion
American cow-parsnip is a tall, dramatic native perennial with large umbrella-shaped white flower clusters and broad, maple-like leaves. This robust plant can reach up to 8 feet tall and creates a bold presence in partially shaded, moist areas. It blooms from June through August with impressive flower heads that can span over a foot across.
In an HOA neighborhood
American Cow-parsnip 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.
- Extremely large size appears overgrown
- Wild, unmanicured appearance
- Can be confused with invasive giant hogweed
Wildlife value
The large flower clusters attract numerous pollinators including native bees, beetles, and flies during its long summer bloom period. Its substantial size and extended flowering make it particularly valuable for supporting diverse pollinator populations.
Common questions
- How much sun does American Cow-parsnip need?
- American Cow-parsnip grows best in part sun conditions.
- When does American Cow-parsnip bloom?
- American Cow-parsnip blooms in June, July, and August.
- Where is American Cow-parsnip native?
- American Cow-parsnip (Heracleum lanatum) is native to AL, AR, CA, CO and 38 more states, per the USDA PLANTS Database and regional native plant society lists.
- What pollinators does American Cow-parsnip attract?
- American Cow-parsnip draws bees, beetles, and flies.
- Is American Cow-parsnip HOA-friendly?
- American Cow-parsnip takes more care to look intentional in a front yard. Consider it for backyard or mid-zone beds rather than the street edge.
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.
Ready to grow American Cow-parsnip? Add it to your garden in Pollinator Patch to track it and get season-by-season care guidance.
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