How much sun does Water Whorl-grass need?

Water Whorl-grass grows best in full sun conditions.

When does Water Whorl-grass bloom?

Water Whorl-grass blooms in May, June, July, and August.

Where is Water Whorl-grass native?

Water Whorl-grass (Catabrosa aquatica) is native to AR, AZ, CO, IA and 12 more states, per the World Checklist of Vascular Plants (Kew).

Is Water Whorl-grass HOA-friendly?

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

Water Whorl-grass

Name: Pollinator Patch
Author: Pollinator Patch

Catabrosa aquatica

Last reviewed: August 2026

Toxicity unknown

Water Whorl-grass (Catabrosa aquatica) 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

high

Size

4"–16" H × 4"–12" W

Bloom

May, Jun, Jul, Aug

Native to

AR, AZ, CO, IA and 12 more states

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.

Find rebates in your area

Browse plants for this ecoregion

Central Basin and Range Northwestern Forested Mountains North American Deserts Southern Rockies High Plains Northwestern Great Plains Great Plains

Water whorl-grass is a low-growing native grass that thrives in consistently moist to wet soils. This perennial forms compact clumps and produces delicate flower clusters from late spring through summer. It naturally occurs in wetlands, pond edges, and other waterlogged areas.

In an HOA neighborhood

Water Whorl-grass takes more care to keep looking intentional in a front yard. Maintenance level: high. Consider it for backyard or mid-zone beds rather than the street edge.

Works well in: backyard only.

Requires consistently wet conditions that may create drainage issues
Has a wild, unmaintained appearance typical of wetland plants
Not suitable for typical residential landscaping conditions

Wildlife value

This grass provides habitat and food for waterfowl and supports various aquatic insects. The seeds are eaten by ducks and other water birds.

Common questions

How much sun does Water Whorl-grass need?: Water Whorl-grass grows best in full sun conditions.
When does Water Whorl-grass bloom?: Water Whorl-grass blooms in May, June, July, and August.
Where is Water Whorl-grass native?: Water Whorl-grass (Catabrosa aquatica) is native to AR, AZ, CO, IA and 12 more states, per the World Checklist of Vascular Plants (Kew).
Is Water Whorl-grass HOA-friendly?: Water Whorl-grass 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.

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 Water Whorl-grass? Add it to your garden in Pollinator Patch to track it and get season-by-season care guidance.

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