When does Grassland Agoseris flower?

Grassland Agoseris typically blooms from May through July, producing solitary bright yellow flower heads on upright leafless stalks.

What pollinators visit Grassland Agoseris?

Bees and butterflies are the most common visitors, drawn to the pollen and nectar of its sunflower-like blooms during the growing season.

How much water does Grassland Agoseris need?

This plant does best with low supplemental water and tolerates dry conditions well once its roots are established.

What growing conditions does Grassland Agoseris prefer?

It grows best in full sun to light part sun with well drained soil, similar to the open grassland and sagebrush sites where it naturally thrives.

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.

Grassland Agoseris

Name: Pollinator Patch
Author: Pollinator Patch

Agoseris grandiflora

Last reviewed: September 2026

Grassland agoseris is a dandelion-like perennial forb with bright yellow flowers blooming from May through July in dry meadows and sagebrush rangelands. It grows best in full sun with low water once established.

Toxicity unknown

Grassland Agoseris (Agoseris grandiflora) is not listed by the ASPCA Animal Poison Control Center (opens in new tab) or the other sources we check, so we have no verdict for it either way. Absence from those lists is not a clearance. If your pet shows symptoms after eating any plant, call the ASPCA at (888) 426-4435.

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

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Browse plants for this ecoregion

Coast Range Puget Lowland Marine West Coast Forest Northwestern Forested Mountains Sierra Nevada Central California Foothills and Coastal Mountains Central California Valley Southern California Mountains North American Deserts Central Basin and Range Southern California/Northern Baja Coast

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

When does Grassland Agoseris flower?: Grassland Agoseris typically blooms from May through July, producing solitary bright yellow flower heads on upright leafless stalks.
What pollinators visit Grassland Agoseris?: Bees and butterflies are the most common visitors, drawn to the pollen and nectar of its sunflower-like blooms during the growing season.
How much water does Grassland Agoseris need?: This plant does best with low supplemental water and tolerates dry conditions well once its roots are established.
What growing conditions does Grassland Agoseris prefer?: It grows best in full sun to light part sun with well drained soil, similar to the open grassland and sagebrush sites where it naturally thrives.
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.

These answers were drafted with an AI model from this plant's data. Verify care details with a local expert.

Native range data from vouchered herbarium specimen records and regional native plant society lists. Pollinator and host plant associations compiled from GBIF, iNaturalist, and published ecological literature.

If something looks wrong

Common plant problems, and what to check first

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