How much sun does Dunbible-weed need?

Dunbible-weed grows best in full sun conditions.

When does Dunbible-weed bloom?

Dunbible-weed blooms in July, August, and September.

Where is Dunbible-weed native?

Dunbible-weed (Ambrosia psilostachya) is native to AL, AR, AZ, CA and 37 more states, per the USDA PLANTS Database and regional native plant society lists.

What pollinators does Dunbible-weed attract?

Dunbible-weed draws bees and beetles.

Is Dunbible-weed HOA-friendly?

Dunbible-weed takes more care to look intentional in a front yard. Consider it for backyard or mid-zone beds rather than the street edge.

Dunbible-weed

Name: Pollinator Patch
Author: Pollinator Patch

Ambrosia psilostachya

Last reviewed: June 2026

Light

full sun

Water

low

Size

12"–36" H × 12"–24" W

Bloom

Jul, Aug, Sep

Native to

AL, AR, AZ, CA and 37 more states

Pollinators

bees, beetles

Browse plants for this ecoregion

Coast Range Sierra Nevada Central California Valley Central California Foothills and Coastal Mountains Southern California Mountains Central Basin and Range Mojave Basin and Range Chihuahuan Deserts Central Oklahoma/Texas Plains Edwards Plateau Southern Texas Plains Texas Blackland Prairies East Central Texas Plains Western Gulf Coastal Plain South Central Plains Sonoran Basin and Range

Western ragweed is a drought-tolerant native perennial that produces inconspicuous greenish flowers from summer through fall. This low-maintenance plant spreads naturally and thrives in sunny, dry conditions with minimal care.

In an HOA neighborhood

Dunbible-weed 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.

Common name includes 'weed' which creates negative perception
Spreads aggressively and can look unkempt
May trigger allergies due to pollen production

Wildlife value

The flowers attract bees and beetles during the long blooming season. As a member of the sunflower family, it provides late-season pollen when many other flowers have finished.

Common questions

How much sun does Dunbible-weed need?: Dunbible-weed grows best in full sun conditions.
When does Dunbible-weed bloom?: Dunbible-weed blooms in July, August, and September.
Where is Dunbible-weed native?: Dunbible-weed (Ambrosia psilostachya) is native to AL, AR, AZ, CA and 37 more states, per the USDA PLANTS Database and regional native plant society lists.
What pollinators does Dunbible-weed attract?: Dunbible-weed draws bees and beetles.
Is Dunbible-weed HOA-friendly?: Dunbible-weed 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 Dunbible-weed? Add it to your garden in Pollinator Patch to track it and get season-by-season care guidance.

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