Grassland Agoseris
Agoseris grandiflora
Last reviewed: June 2026
Agoseris grandiflora is a native western North American wildflower that produces bright yellow dandelion-like blooms from May through July in grasslands and dry meadows.
The USDA PLANTS Database (opens in new tab) does not flag Grassland Agoseris as toxic to livestock.
Light
full sun
Water
low
Size
6"–24" H × 4"–12" W
Bloom
May, Jun, Jul
Native to
CA, ID, MT, NV and 3 more states
Pollinators
bees, butterflies
Browse plants for this ecoregion
Grassland agoseris is a low-growing perennial wildflower that produces bright yellow dandelion-like blooms from late spring through summer. This drought-tolerant native forms compact clumps with basal leaves and reaches up to 2 feet tall when flowering. It naturally goes dormant in late summer, disappearing until the following spring.
Growing Grassland Agoseris
Grow Grassland Agoseris in full sun and low water. Mature plants reach 6 to 24 inches tall and spread 4 to 12 inches wide. Expect low maintenance to keep it looking intentional in a front yard.
In an HOA neighborhood
Grassland Agoseris 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.
- Resembles dandelions which many consider weeds
- Completely disappears during dormancy leaving bare spots
- Informal wildflower appearance doesn't fit manicured landscape expectations
Wildlife value
The cheerful yellow flowers attract native bees and butterflies during the peak growing season. Seeds provide food for small birds and mammals in late summer.
Common questions
- Where does Agoseris grandiflora naturally grow?
- Grassland Agoseris is native to seven western states: California, Idaho, Montana, Nevada, Oregon, Utah, and Washington, where it grows in grasslands, meadows, and open areas.
- When does Grassland Agoseris bloom?
- Agoseris grandiflora typically blooms from May through July, producing large yellow flower heads that resemble dandelions but are much larger.
- What pollinators visit Agoseris grandiflora?
- The bright yellow flowers attract various bees and butterflies, which help pollinate the plant while feeding on its nectar.
- What growing conditions does Grassland Agoseris prefer?
- This drought-tolerant perennial thrives in full sun conditions with low water requirements, making it well-suited to dry grasslands and xeriscaped gardens.
- Is Grassland Agoseris toxic to livestock?
- The USDA PLANTS Database does not flag Grassland Agoseris as toxic to livestock.
- Is Grassland Agoseris HOA-friendly?
- Grassland Agoseris 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 Grassland Agoseris? Add it to your garden in Pollinator Patch to track it and get season-by-season care guidance.
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