North America Native Plant

Deerbrush

Botanical name: Ceanothus integerrimus

USDA symbol: CEIN3

Life cycle: perennial

Habit: shrub

Native status: Native to the lower 48 states  

Synonyms: Ceanothus andersonii Parry (CEAN2)  âš˜  Ceanothus californicus Kellogg (CECA7)  âš˜  Ceanothus integerrimus Hook. & Arn. var. californicus (Kellogg) G.T. Benson (CEINC)  âš˜  Ceanothus integerrimus Hook. & Arn. var. macrothyrsus (Torr.) G.T. Benson (CEINM)  âš˜  Ceanothus integerrimus Hook. & Arn. var. puberulus (Greene) Abrams (CEINP)   

Deerbrush: A Drought-Tolerant Native Shrub That Wildlife Loves If you’re looking for a low-maintenance native shrub that can handle tough conditions while providing year-round interest, deerbrush (Ceanothus integerrimus) might just be your garden’s new best friend. This hardy western native has been quietly working its magic in landscapes from California ...

Deerbrush: A Drought-Tolerant Native Shrub That Wildlife Loves

If you’re looking for a low-maintenance native shrub that can handle tough conditions while providing year-round interest, deerbrush (Ceanothus integerrimus) might just be your garden’s new best friend. This hardy western native has been quietly working its magic in landscapes from California to Washington, and it’s time more gardeners discovered its many charms.

What Makes Deerbrush Special?

Deerbrush is a true native success story. This perennial shrub calls the western United States home, naturally occurring across Arizona, California, New Mexico, Oregon, and Washington. As a member of the buckthorn family, it brings both beauty and ecological value to any landscape lucky enough to host it.

The plant typically grows as a multi-stemmed shrub reaching about 13 feet at maturity, though it usually stays more compact in garden settings. With its moderate growth rate, you won’t have to worry about it taking over your yard overnight – it’s more of a slow-and-steady performer that gets better with age.

A Feast for the Eyes (and the Pollinators)

Come late spring, deerbrush puts on quite a show with clusters of small white flowers that practically buzz with pollinator activity. Native bees, butterflies, and other beneficial insects can’t resist these nectar-rich blooms, making your garden a hub of natural activity. The flowers are conspicuous enough to catch your eye but subtle enough to blend beautifully with other native plants.

The medium-textured green foliage provides a lovely backdrop year-round, with dense summer coverage that transitions to moderate winter porosity. While the fall color won’t stop traffic, the overall form and texture make it a reliable landscape anchor that looks good in every season.

Perfect for Tough Love Gardening

Here’s where deerbrush really shines: it’s built for challenging conditions. This plant laughs in the face of drought once established, requiring minimal water and thriving in areas where other plants might struggle. It’s equally happy in coarse, medium, or fine-textured soils and can handle pH levels from slightly alkaline (7.1) to moderately alkaline (8.5).

Growing conditions deerbrush loves:

  • Full sun (shade intolerant, so don’t try to tuck it under trees)
  • Well-draining soils of almost any texture
  • Low to moderate rainfall (16-40 inches annually)
  • USDA hardiness zones 7-10
  • Low fertility requirements (it actually prefers lean soils)

Landscape Uses That Make Sense

Deerbrush is incredibly versatile in the landscape. Its semi-erect growth form and ability to resprout make it excellent for:

  • Erosion control on slopes and hillsides
  • Naturalized gardens and wildlife habitats
  • Drought-tolerant landscape borders
  • Native plant gardens
  • Low-maintenance commercial landscapes

The plant’s nitrogen-fixing ability (though low) means it can actually improve soil conditions over time, making it a great choice for restoration projects or areas with poor soil.

Getting Started: Planting and Care Tips

The good news about deerbrush is that once you get it established, it pretty much takes care of itself. Seeds require cold stratification, so if you’re growing from seed, plan accordingly. Most gardeners will have better luck with container plants or bare root specimens.

Planting tips:

  • Plant in spring for best establishment
  • Space plants 4-9 feet apart depending on your desired coverage
  • Water regularly the first year, then reduce to minimal supplemental watering
  • Avoid rich, heavily fertilized soils – this plant prefers it lean
  • Ensure excellent drainage to prevent root rot

Ongoing care:

  • Prune lightly after blooming if needed for shape
  • Generally pest and disease free
  • No fertilization needed once established
  • Extremely drought tolerant after the first growing season

The Wildlife Connection

Beyond its ornamental value, deerbrush serves as an important part of the native ecosystem. The flowers provide nectar for pollinators during their peak bloom period in late spring, while the seeds (which persist through summer) offer food for birds and small mammals. The dense foliage also provides shelter and nesting sites for various wildlife species.

Is Deerbrush Right for Your Garden?

Deerbrush is an excellent choice if you want a low-maintenance native plant that supports local wildlife while looking good year-round. It’s particularly perfect for gardeners dealing with challenging conditions like poor soil, limited water, or slopes prone to erosion.

However, keep in mind that this plant needs full sun and good drainage – it won’t tolerate shade or soggy conditions. Also, with a mature height of around 13 feet, make sure you have adequate space for it to reach its full potential.

If you’re committed to supporting native ecosystems while creating a beautiful, sustainable landscape, deerbrush deserves serious consideration. It’s one of those plants that proves native doesn’t mean boring – sometimes it just means brilliant.

How

Deerbrush

Grows

Growing season

Spring and Summer

Lifespan

Long

Growth form & shape

Multiple Stem and Semi-Erect

Growth rate

Moderate

Height at 20 years

11

Maximum height

13.0

Foliage color

Green

Summer foliage density

Dense

Winter foliage density

Moderate

Foliage retention

No

Flowering

Yes

Flower color

White

Fruit/seeds

Yes

Fruit/seed color

Brown

Allelopath

No

Nitrogen fixing

Low

Toxic

None

C:N Ratio

Low

Fire Resistant

No

Foliage Texture

Medium

Low-growing Grass

No

Resproutability

Yes

Coppice Ability

No

Bloat

None

Deerbrush

Growing Conditions

Adapted to Coarse Soil

Yes

Adapted to Medium Soil

Yes

Adapted to Fine Soil

Yes

Anaerobic tolerance

None

CaCO₃ tolerance

Medium

Cold Stratification

Yes

Drought tolerance

High

Nutrient requirement

Low

Fire tolerance

Low

Frost-free days minimum

160

Hedge tolerance

None

Moisture requirement

Low

pH range

7.1 to 8.5

Plants per acre

1212 to 2728

Precipitation range (in)

16 to 40

Min root depth (in)

20

Salt tolerance

None

Shade tolerance

Intolerant

Min temperature (F)

-13

Cultivating

Deerbrush

Flowering season

Late Spring

Commercial availability

Field Collections Only

Fruit/seed abundance

Medium

Fruit/seed season

Summer to Summer

Fruit/seed persistence

No

Propagated by bare root

Yes

Propagated by bulb

No

Propagated by container

Yes

Propagated by corm

No

Propagated by cuttings

No

Propagated by seed

Yes

Propagated by sod

No

Propagated by sprigs

No

Propagated by tubers

No

Seed per pound

70000

Seed spread rate

Moderate

Seedling vigor

Medium

Small grain

No

Vegetative spread rate

None

Deerbrush

Classification

Group

Dicot

Kingdom

Plantae - Plants

Subkingdom

Tracheobionta - Vascular plants

Superdivision

Spermatophyta - Seed plants

Division

Magnoliophyta - Flowering plants

Subdivision
Class

Magnoliopsida - Dicotyledons

Subclass

Rosidae

Order

Rhamnales

Family

Rhamnaceae Juss. - Buckthorn family

Genus

Ceanothus L. - ceanothus

Species

Ceanothus integerrimus Hook. & Arn. - deerbrush

Plant data source: USDA, NRCS 2025. The PLANTS Database. https://plants.usda.gov,. 2/25/2025. National Plant Data Team, Greensboro, NC USA