How much sun does Warty Caltrop need?

Warty Caltrop grows best in full sun conditions.

When does Warty Caltrop bloom?

Warty Caltrop blooms in June, July, August, September, and October.

Where is Warty Caltrop native?

Warty Caltrop (Kallstroemia parviflora) is native to AZ, CA, CO, IL and 8 more states, per the World Checklist of Vascular Plants (Kew).

What pollinators does Warty Caltrop attract?

Warty Caltrop draws bees and beetles.

Is Warty Caltrop HOA-friendly?

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

Warty Caltrop

Name: Pollinator Patch
Author: Pollinator Patch

Kallstroemia parviflora

Last reviewed: August 2026

Light

full sun

Water

low

Size

4"–16" H × 6"–24" W

Bloom

Jun, Jul, Aug, Sep, Oct

Native to

AZ, CA, CO, IL and 8 more states

Pollinators

bees, beetles

Before you buy

Your city may pay you to plant this

Cities and water utilities offer rebates for replacing lawn with native and water-wise plants. We track 432 programs across 44 states, each with a link to the provider and the date we last checked it.

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Browse plants for this ecoregion

Southern California Mountains Mojave Basin and Range North American Deserts Arizona/New Mexico Mountains Chihuahuan Deserts High Plains Southwestern Tablelands Central Great Plains Cross Timbers Edwards Plateau Southern Texas Plains Texas Blackland Prairies South Central Plains Madrean Archipelago Sonoran Basin and Range

Warty caltrop is a low-growing annual wildflower that spreads along the ground with small orange or yellow blooms from summer through fall. This native plant thrives in hot, dry conditions and requires minimal water once established. As an annual, it will reseed naturally in favorable conditions.

In an HOA neighborhood

Warty Caltrop 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.

Low prostrate growth appears weedy
Common name includes 'caltrop' which sounds undesirable
Annual lifecycle creates gaps in landscape design

Wildlife value

The long blooming period from June through October provides nectar for native bees and beetles when many other plants have finished flowering.

Common questions

How much sun does Warty Caltrop need?: Warty Caltrop grows best in full sun conditions.
When does Warty Caltrop bloom?: Warty Caltrop blooms in June, July, August, September, and October.
Where is Warty Caltrop native?: Warty Caltrop (Kallstroemia parviflora) is native to AZ, CA, CO, IL and 8 more states, per the World Checklist of Vascular Plants (Kew).
What pollinators does Warty Caltrop attract?: Warty Caltrop draws bees and beetles.
Is Warty Caltrop HOA-friendly?: Warty Caltrop 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 World Checklist of Vascular Plants (Kew). Pollinator and host plant associations compiled from GBIF, iNaturalist, and published ecological literature.

Ready to grow Warty Caltrop? Add it to your garden in Pollinator Patch to track it and get season-by-season care guidance.

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