How much sun does Bristly Lady's-thumb need?

Bristly Lady's-thumb grows best in part sun conditions.

When does Bristly Lady's-thumb bloom?

Bristly Lady's-thumb blooms in June, July, August, and September.

Where is Bristly Lady's-thumb native?

Bristly Lady's-thumb (Polygonum caespitosum) is native to FL, per vouchered herbarium specimen records and regional native plant society lists.

What pollinators does Bristly Lady's-thumb attract?

Bristly Lady's-thumb draws bees and flies.

Is Bristly Lady's-thumb HOA-friendly?

Bristly Lady's-thumb takes more care to look intentional in a front yard. Consider it for backyard or mid-zone beds rather than the street edge.

Bristly Lady's-thumb

Name: Pollinator Patch
Author: Pollinator Patch

Polygonum caespitosum

Last reviewed: September 2026

Toxicity unknown

Bristly Lady's-thumb (Polygonum caespitosum) 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

part sun

Water

medium

Size

6"–24" H × 6"–18" W

Bloom

Jun, Jul, Aug, Sep

Native to

Pollinators

bees, flies

Native alternatives to Bristly Lady's-thumb

Bristly Lady's-thumb is not native to the United States. These natives fill a similar role in a planting, matched on bloom season, bloom color and mature size.

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 452 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

Middle Atlantic Coastal Plain Northern Piedmont Southeastern Plains Ridge and Valley Eastern Temperate Forests Central Appalachians Western Allegheny Plateau Interior Plateau

Bristly lady's-thumb is a low-growing annual wildflower with small pink flower spikes that bloom from summer through fall. This native groundcover spreads naturally and provides seasonal color in informal garden areas.

In an HOA neighborhood

Bristly Lady's-thumb 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.

Has weedy appearance and growth habit
May self-seed aggressively
Dies back completely as annual

Wildlife value

The small flowers attract bees and beneficial flies during the long blooming season from June through September.

Common questions

How much sun does Bristly Lady's-thumb need?: Bristly Lady's-thumb grows best in part sun conditions.
When does Bristly Lady's-thumb bloom?: Bristly Lady's-thumb blooms in June, July, August, and September.
Where is Bristly Lady's-thumb native?: Bristly Lady's-thumb (Polygonum caespitosum) is native to FL, per vouchered herbarium specimen records and regional native plant society lists.
What pollinators does Bristly Lady's-thumb attract?: Bristly Lady's-thumb draws bees and flies.
Is Bristly Lady's-thumb HOA-friendly?: Bristly Lady's-thumb takes more care to look intentional in a front yard. Consider it for backyard or mid-zone beds rather than the street edge.

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.

See all plant problem guides

Ready to grow Bristly Lady's-thumb? Add it to your garden in Pollinator Patch to track it and get season-by-season care guidance.

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