Slender Woodoats

Name: Pollinator Patch
Author: Pollinator Patch

Chasmanthium laxum

Last reviewed: August 2026

Chasmanthium laxum, or slender woodoats, is a shade tolerant grass that blooms from June through August and grows well along moist woodland edges and stream banks in the southeastern United States.

Toxicity unknown

Slender Woodoats (Chasmanthium laxum) 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.

The USDA PLANTS Database (opens in new tab) does not flag Slender Woodoats as toxic to livestock.

Light

full sun

Water

low

Size

24"–36" H × 12"–24" W

Bloom

Jun, Jul, Aug

Native to

AL, AR, DE, FL and 14 more states

Pollinators

butterflies

Before you buy

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Browse plants for this ecoregion

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Slender Woodoats is a graceful native grass that forms neat clumps with delicate, drooping seed heads that sway in the breeze. This drought-tolerant perennial produces attractive oat-like flowers in summer and provides excellent texture in landscaping. It goes dormant in winter but returns reliably each spring.

Growing Slender Woodoats

Grow Slender Woodoats in full sun and low water. Mature plants reach 24 to 36 inches tall and spread 12 to 24 inches wide. Expect low maintenance to keep it looking intentional in a front yard.

In an HOA neighborhood

Slender Woodoats is an HOA-friendly choice. Maintenance level: low. Tidiness: 4 out of 5.

Works well in: front yard, mid zone.

Cut back in late winter

Wildlife value

The seed heads attract butterflies and provide food for songbirds. Small mammals also benefit from the seeds and shelter the grass provides.

Common questions

How much sun does slender woodoats need?: Chasmanthium laxum grows in conditions ranging from full sun to full shade, though it tends to form denser, more upright clumps with at least a few hours of sun each day.
When does slender woodoats bloom?: It blooms from June through August, producing flattened, drooping seed spikelets on arching stems that persist into fall.
Does slender woodoats attract pollinators?: Butterflies visit this grass, and its seed heads also provide food for birds through the fall and winter months.
How much water does slender woodoats need?: It tolerates conditions from consistently moist soil to drier sites once established, which makes it a good fit for woodland edges, ditches, and stream banks.
Is slender woodoats an evergreen grass?: No, it is deciduous and dies back to the ground each winter, regrowing from its base the following spring.
Is Slender Woodoats toxic to livestock?: The USDA PLANTS Database does not flag Slender Woodoats as toxic to livestock.
Is Slender Woodoats HOA-friendly?: Slender Woodoats is generally an HOA-friendly choice in the right placement, with low maintenance.

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.

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Common questions

How much sun does slender woodoats need?

Chasmanthium laxum grows in conditions ranging from full sun to full shade, though it tends to form denser, more upright clumps with at least a few hours of sun each day.

When does slender woodoats bloom?

It blooms from June through August, producing flattened, drooping seed spikelets on arching stems that persist into fall.

Does slender woodoats attract pollinators?

Butterflies visit this grass, and its seed heads also provide food for birds through the fall and winter months.

How much water does slender woodoats need?

It tolerates conditions from consistently moist soil to drier sites once established, which makes it a good fit for woodland edges, ditches, and stream banks.

Is slender woodoats an evergreen grass?

No, it is deciduous and dies back to the ground each winter, regrowing from its base the following spring.

Is Slender Woodoats toxic to livestock?

The USDA PLANTS Database does not flag Slender Woodoats as toxic to livestock.

Is Slender Woodoats HOA-friendly?

Slender Woodoats is generally an HOA-friendly choice in the right placement, with low maintenance.

These answers were drafted with an AI model from this plant's data. Verify care details with a local expert.

Common plant problems, and what to check first

See all plant problem guides