groundcoverN. America Native

Pinemat

The Story

Plant Bio

Ceanothus prostratus, commonly known as pinemat, is a prostrate, mat-forming evergreen groundcover native to the coniferous forests of western North America. The trailing stems root where they touch the ground, spreading to form dense, flat carpets of leathery, dark green leaves with sharp, tooth-like margins.

Small, dense clusters of deep blue to lavender-purple flowers appear from spring to early summer, followed by small, horned seed capsules. The foliage features a pale, felt-like underside that contrasts with the hairless, dark green upper surface.

Uses & Benefits:

Forms a dense, evergreen carpet of dark green, holly-like leaves topped with deep blue to lavender flowers in spring.

Excellent for erosion control on dry, rocky slopes and mountain garden beds where other groundcovers fail.

Provides high-value nectar for native bees and pollinators, while the dense mats offer cover for ground-dwelling wildlife and songbirds.

Essentials

At a Glance

Plant Type

Groundcover

Height

12"

Width

94"

Light

Full Sun, Partial Sun

Zones

5, 6, 7, 8, 9

Water

Low

Humidity

Low to moderate

Lifespan

Perennial

Native To

Western North America

Toxicity

Non-toxic

Bloom period

Spring – Early summer

In flower about 4 months of the year

Planting

How to Grow

Select a planting site with gritty, rocky, well-drained soil in full sun or light afternoon shade.
Plant in acidic to neutral soil, ensuring the crown sits slightly above the surrounding soil level to prevent moisture accumulation.
Water sparingly during the first summer to establish the root system, then cease summer irrigation entirely.
Avoid applying heavy fertilizers, as the plant naturally associates with nitrogen-fixing bacteria.

Pro Tip

Never shear this groundcover or cut back into old, leafless woody stems, as they fail to resprout from old wood.

Keep It Thriving

Care Guide

Do

Ensure the soil has exceptional drainage before planting.
Provide a dry summer rest period once the plant is established.
Tip-prune lightly immediately after flowering to maintain shape.

Don't

Do not water during hot summer periods, which triggers root rot.
Do not cut back into old, thick, leafless woody stems.
Do not plant in heavy, wet clay soils.

Seasonal Care Calendar

Task	Jan	Feb	Mar	Apr	May	Jun	Jul	Aug	Sep	Oct	Nov	Dec
Pest Check
Plant
Propagate
Prune

Watch Out For

Pests & Diseases

Common Pests

Common Diseases

In the Garden

Landscape Uses & Companions

Landscape Uses

Rock gardensErosion control on dry slopesUnderstory groundcoverDry mountain gardens

Companion Plants

Pinus ponderosa Pseudotsuga menziesii Arctostaphylos Pinus jeffreyi

Multiply

Propagation Methods

Good to Know

Common Questions

Pinemat questions

What zones can Pinemat grow in?

Pinemat is hardy in USDA Zones 5–9. Inside that range it survives winter in the ground; outside it, grow it as an annual or a container plant you protect.

Is Pinemat deer resistant?

Not reliably. Deer may browse Pinemat, especially tender spring growth — plan on repellents or fencing where pressure is high.

When does Pinemat bloom?

Pinemat typically blooms in spring through early summer. Exact timing shifts a week or two with your zone — Sow's bloom calendar maps it to your garden.

Does Pinemat need full sun?

Pinemat does best in full sun to part shade. In hot climates, afternoon shade keeps blooms fresher longer.

Is Pinemat drought tolerant?

Yes — once established (usually after the first full season), Pinemat handles dry spells with minimal watering. Water deeply its first year to build the root system that makes that possible.