Species

Ceanothus x delileanusCalifornia Lilac

shrub

Ray Hartman California Lilac

Ceanothus x delileanus 'Ray Hartman'

The Story

Plant Bio

A vigorous evergreen shrub known for its striking blue flowers and attractive foliage.

This cultivar is particularly noted for its large size, vigorous growth, and tolerance of a wider range of garden conditions than many other California lilacs.

Uses & Benefits:

The Ray Hartman cultivar features vibrant blue flowers and silvery foliage, enhancing garden aesthetics with drought tolerance and low maintenance.

Ideal for xeriscaping and erosion control, requiring minimal watering once established.

Provides habitat and nectar for native pollinators and beneficial insects.

SpeciesCeanothus x delileanusCalifornia Lilac

Essentials

At a Glance

Plant Type

Shrub

Height

180 inches

Width

180 inches

Light

Full Sun, Partial Sun

Zones

7, 8, 9, 10

Water

Drought-tolerant once established

Humidity

Low to moderate

Lifespan

Decades

Native To

California and Pacific Northwest

Toxicity

Non-toxic

Bloom period

Early summer – Late summer

In flower about 3 months of the year

Planting

How to Grow

Select a sunny location with well-draining soil for planting.
Tuck seeds or cuttings into the soil, ensuring good contact for root development.
Water thoroughly after planting to settle the soil and eliminate air pockets.
Maintain consistent moisture during the first growing season.
Mist cuttings regularly to encourage root formation, typically taking 6 weeks.
Apply a layer of mulch around the plant to retain moisture and suppress weeds.

Pro Tip

Use well-draining soil and avoid overwatering to prevent root rot.

Keep It Thriving

Care Guide

Do

Water regularly during dry spells 🌱
Prune after flowering to maintain shape
Apply a balanced fertilizer in early spring
Mulch to conserve moisture and regulate soil temperature

Don't

Overwater, leading to soggy roots ❌
Prune in late fall or winter ❌
Use heavy clay soil without amendment ❌
Ignore pest signs or disease symptoms ❌

Seasonal Care Calendar

Task	Jan	Feb	Mar	Apr	May	Jun	Jul	Aug	Sep	Oct	Nov	Dec
Fertilize
Mulch
Plant
Prune

Watch Out For

Pests & Diseases

Common Pests

Common Diseases

In the Garden

Landscape Uses & Companions

Landscape Uses

Sunny border accentDrought-tolerant xeriscape feature

Companion Plants

Lavender Russian sage Yarrow Sedum Echinacea

Multiply

Propagation Methods

Good to Know

Common Questions

Ray Hartman California Lilac questions

What zones can Ray Hartman California Lilac grow in?

Ray Hartman California Lilac is hardy in USDA Zones 7–10. Inside that range it survives winter in the ground; outside it, grow it as an annual or a container plant you protect.

Is Ray Hartman California Lilac deer resistant?

Yes — Ray Hartman California Lilac is rated deer-resistant. Deer typically pass it over, though extreme hunger can override any plant's defenses.

When does Ray Hartman California Lilac bloom?

Ray Hartman California Lilac typically blooms in early summer through late summer. Exact timing shifts a week or two with your zone — Sow's bloom calendar maps it to your garden.

Does Ray Hartman California Lilac need full sun?

Ray Hartman California Lilac does best in full sun to part shade. In hot climates, afternoon shade keeps blooms fresher longer.

Is Ray Hartman California Lilac drought tolerant?

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