Julia Phelps ceanothus

Sun

Full sun; tolerates light afternoon shade in hot inland gardens.

Water

Low once established. Water deeply during establishment, then allow the soil to dry between waterings; avoid frequent summer irrigation.

Soil

Well-drained sandy, gravelly or loamy soil. Avoid waterlogged ground and heavily enriched planting holes.

Height

6-8 ft (1.8-2.4 m)

Spread

6-10 ft (1.8-3 m)

Flowers

Dense clusters of deep blue-purple flowers in spring, sometimes extending into early summer in cooler climates.

Foliage

Evergreen. Small, dark green leaves with a strongly wrinkled surface and toothed edges; aromatic when crushed.

Growth

Moderate to fast in suitable conditions.

Care needed

Low

• Pollinators
• Drought tolerant
• Heat tolerant
• Wildlife
• Low allergen

Northern hemisphere months. In Australia, shift them by six.

Difficulty

Hard

Toughness

Fairly tough

Pick your zone, country, light and whether you have pets.

1. Planting day

   1.6 ft (0.5 m)

2. After 1 year

   3 ft (0.9 m)

3. After 2 years

   4 ft (1.3 m)

4. After 3 years

   6 ft (1.7 m)

5. After 5 years

   7 ft (2.1 m)

   full size

About 4 years to full size.

From a typical nursery size, at an average rate for this kind of plant. A rule of thumb, not a forecast.

Cats and dogs

Safe

Growth rate

Fast

• Plant in autumn in mild climates or in spring where winters are colder, with the root crown at soil level.
• Water deeply through the first growing season as needed, letting the soil partly dry between waterings.
• Once established, avoid routine summer watering; give occasional deep water only during prolonged drought if the plant shows stress.
• Do not routinely fertilize or add rich manure; excessive feeding encourages soft growth.
• Keep mulch clear of the stems and leave enough space for its mature width.

Pruning. Immediately after flowering, lightly shorten leafy shoots to shape the shrub. Avoid hard renovation pruning or cutting into bare old wood, which often fails to reshoot.

Spring

Plant in colder parts of its range once severe frost has passed, and water new plants thoroughly.

Late spring

After flowering, lightly trim wayward leafy shoots without cutting into bare wood.

Summer

Check newly planted shrubs for dry soil; keep established plants away from regular lawn or border irrigation.

Autumn

Plant in mild regions while the soil is warm and seasonal rain is returning.

Winter

Check that water drains away from the root crown; gently remove heavy snow before branches split.

• Use as a spring-flowering specimen against a plain wall or evergreen backdrop.
• Plant as an informal screen along a sunny boundary, allowing room for its broad outline.
• Combine with rockrose, lavender and other dry-summer shrubs in a gravel garden.
• Place on a well-drained bank with California native perennials for seasonal colour and pollinator habitat.

Garden styles it suits: California native, Mediterranean, Desert / xeriscape, Dry gravel garden, Pollinator garden and Coastal.

Plant it with: California buckwheat, Cleveland sage, Manzanita, Rockrose, Lavender and California poppy.

Wildlife: Flowers attract bees and other pollinating insects. The dense evergreen branches provide shelter for small birds.

• Root and crown rot in wet soil: improve drainage before planting, keep the crown uncovered and avoid frequent irrigation.
• Winter burn or frost damage: choose a sheltered position out of cold drying winds and wait until spring growth begins before removing damaged shoots.
• Scale insects: inspect stems and leaf undersides; remove small infestations by hand and use a labelled treatment only if necessary.
• Dieback after hard pruning: trim only into leafy growth; replace a badly overgrown shrub rather than trying to renovate it severely.

Not known to be toxic to people, cats, dogs or horses. No part is regarded as a significant poisoning hazard, but it is an ornamental plant rather than a food plant.

• Concha ceanothus (Ceanothus 'Concha')

  Usually has larger, less deeply wrinkled leaves and a more open, arching outline; Julia Phelps has particularly small, puckered leaves.

• Carmel creeper (Ceanothus griseus var. horizontalis)

  Forms a low, spreading groundcover with broader leaves rather than the tall, rounded shrub made by Julia Phelps.

• Blueblossom (Ceanothus thyrsiflorus)

  Typically has larger, less puckered leaves and a taller habit, with flowers often a lighter blue.

Ceanothus comes from the ancient Greek name keanothos, originally used for a different spiny shrub.

Propagation. Take semi-ripe cuttings in summer and root them in a free-draining medium with gentle humidity. Seedlings will not reliably reproduce this named cultivar.

Accepted botanical name

Ceanothus

Sources: GBIF (CC BY 4.0). The care and design notes are LandscapeGPT's own.