Annual Agoseris
Agoseris heterophylla
Last reviewed: August 2026
Agoseris heterophylla is a low-growing annual forb with yellow, dandelion-like flower heads that bloom from April through July. It favors full sun and dry, well-drained soils common in open western rangeland and grassland habitats.
Toxicity unknown
Annual Agoseris (Agoseris heterophylla) 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.
Light
full sun
Water
low
Size
4"–24" H × 2"–12" W
Bloom
Apr, May, Jun, Jul
Native to
AZ, CA, ID, MT and 5 more states
Pollinators
bees, butterflies
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Annual agoseris is a low-growing wildflower that produces bright yellow dandelion-like blooms from spring through summer. This native forb forms compact rosettes of leaves with flowers held on short stems, thriving in sunny locations with minimal water once established.
Growing Annual Agoseris
Grow Annual Agoseris in full sun and low water. Mature plants reach 4 to 24 inches tall and spread 2 to 12 inches wide. Expect low maintenance to keep it looking intentional in a front yard.
In an HOA neighborhood
Annual 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.
- Strongly resembles dandelions which many consider weeds
- Annual nature means gaps when plants don't return
- Can appear unkempt as flowers fade and go to seed
Wildlife value
The cheerful yellow flowers attract native bees and butterflies throughout the long blooming season. As an annual, it provides consistent nectar sources from April through July.
Common questions
- When does Annual Agoseris bloom?
- Annual Agoseris typically flowers from April through July, with timing varying by elevation and local spring moisture.
- What pollinators visit Annual Agoseris?
- Bees and butterflies visit the yellow flower heads of Annual Agoseris for nectar and pollen.
- What growing conditions suit Annual Agoseris best?
- This forb grows best in full sun with low water needs, matching the dry, open sites where it is commonly found.
- What does Annual Agoseris look like as a plant?
- It is a small annual forb forming a basal rosette of leaves with a single dandelion-like flower head on a leafless stalk.
- Is Annual Agoseris HOA-friendly?
- Annual 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
These come up on almost any plant. Each guide lists the likely causes in the order they are worth ruling out, with one thing to check before you act on any of them, and links to the source it came from.
- It is dying right after planting
- Leaves turning yellow
- Wilting even though I watered it
- Brown crispy leaf tips
- Bugs on the plant
Ready to grow Annual Agoseris? Add it to your garden in Pollinator Patch to track it and get season-by-season care guidance.
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