How to grow California Lilac in the UK
Ceanothus
California Lilac (Ceanothus) is a flower that grows well in UK gardens. Most spectacular blue in the garden. Short-lived (10 years) and brittle — site sheltered. This guide covers when and how to sow California Lilac, the soil and position it likes, watering and feeding, companion planting, and when to harvest.
Type
Flowers
Difficulty
Moderate
Position
full sun (6+ hrs direct)
Sow
spring
Harvest
—
When to sow & grow California Lilac
Sowing and harvest window through the year (UK):
Jan | Feb | Mar | Apr Plant | May | Jun | Jul | Aug | Sep | Oct | Nov | Dec |
Soil, position & care
- Soil
- Most well-drained soils with added organic matter
- Soil pH
- 6.0–7.5
- Position
- Sun or part shade depending on species
- Sowing depth
- Plant so the rootball top sits level with the soil
- Spacing
- Allow for mature spread
- Sowing
- Plant from containers spring or autumn; water in well
- Growing
- Water through the first two summers; mulch annually
- Harvest & upkeep
- Prune to shape after flowering; remove dead/crossing wood
- Watch for
- Generally tough; watch aphids and powdery mildew
Companion planting for California Lilac
No specific companion notes for this plant.
Grow California Lilac this year
Add California Lilac to your free 12-month plan and get watering & sowing reminders — no sign-up needed.
California Lilac FAQs
How much sun does California Lilac need?
California Lilac prefers full sun (6+ hrs direct).
Is California Lilac easy to grow?
Moderate. Most spectacular blue in the garden. Short-lived (10 years) and brittle — site sheltered.