When does Bromus carinatus bloom?

Bromus carinatus generally flowers from May through July, sending up open, nodding panicles of spikelets above the grass clump.

What light and water does Bromus carinatus need?

This grass performs best in full sun with medium moisture, though established plants handle drier, well-drained sites once their root systems mature.

Do bees use Bromus carinatus?

Bees are recorded visiting Bromus carinatus stands, using the grass for pollen collection and as cover or nesting material near the bunchgrass clumps.

Is Bromus carinatus evergreen?

No. It behaves as a cool-season grass that greens up in spring, flowers into summer, then dries back as conditions turn hot and dry.

Is Sweet Brome toxic to livestock?

The USDA PLANTS Database does not flag Sweet Brome as toxic to livestock.

Is Sweet Brome HOA-friendly?

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

Sweet Brome

Name: Pollinator Patch
Author: Pollinator Patch

Bromus carinatus

Last reviewed: September 2026

Bromus carinatus, or California brome, is a bunchgrass that blooms from May through July, growing in full sun with moderate water in grasslands, open woodlands, and disperse rangeland sites across the West.

Toxicity unknown

Sweet Brome (Bromus carinatus) 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 Sweet Brome as toxic to livestock.

Light

full sun

Water

medium

Size

12"–48" H × 12"–24" W

Bloom

May, Jun, Jul

Native to

CA, CO, KS, NM and 3 more states

Pollinators

bees

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Browse plants for this ecoregion

Coast Range Puget Lowland Marine West Coast Forest Northwestern Forested Mountains Sierra Nevada Central California Foothills and Coastal Mountains Central California Valley Southern California Mountains North American Deserts Central Basin and Range Mojave Basin and Range Southern Rockies Arizona/New Mexico Mountains Chihuahuan Deserts High Plains Southwestern Tablelands Madrean Archipelago Sonoran Basin and Range Southern California/Northern Baja Coast

Sweet brome is a native bunch grass that forms clumps 12-48 inches tall with an upright, fountain-like growth habit. It produces attractive seed heads from May through July and tolerates drought well once established. This perennial grass works well in naturalized areas and mixed plantings.

Growing Sweet Brome

Grow Sweet Brome in full sun and medium water. Mature plants reach 12 to 48 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

Sweet Brome 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.

Tall height may appear unkempt to HOAs
Seed heads can look weedy to conventional tastes
Winter dormancy creates brown appearance for months

Wildlife value

The flowers attract bees and other pollinators during its spring and summer bloom period. Seeds provide food for birds and small wildlife.

Common questions

When does Bromus carinatus bloom?: Bromus carinatus generally flowers from May through July, sending up open, nodding panicles of spikelets above the grass clump.
What light and water does Bromus carinatus need?: This grass performs best in full sun with medium moisture, though established plants handle drier, well-drained sites once their root systems mature.
Do bees use Bromus carinatus?: Bees are recorded visiting Bromus carinatus stands, using the grass for pollen collection and as cover or nesting material near the bunchgrass clumps.
Is Bromus carinatus evergreen?: No. It behaves as a cool-season grass that greens up in spring, flowers into summer, then dries back as conditions turn hot and dry.
Is Sweet Brome toxic to livestock?: The USDA PLANTS Database does not flag Sweet Brome as toxic to livestock.
Is Sweet Brome HOA-friendly?: Sweet Brome takes more care to look intentional in a front yard. Consider it for backyard or mid-zone beds rather than the street edge.

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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