Ceanothus (Californian Lilac) 'Concha'
A spectacular sight in the spring garden, this evergreen shrub is celebrated for its profuse, rounded clusters of deep cobalt-blue flowers that open from reddish-purple buds, creating a truly intense splash of colour . Its dense, mounding habit and gracefully arching branches are clothed in small, narrow, dark green and glossy leaves that provide reliable structure and texture throughout the year . This is one of the most reliable and popular selections of Californian Lilac, offering a fantastic display that attracts bees and butterflies, and is well suited for use as a striking specimen, an informal hedge, or a vibrant backdrop in a sheltered border . It is a tough, drought-tolerant plant once established, though it requires a sunny spot with well-drained soil to perform at its best and should be protected from strong, cold winds .
Family of Trees: Rhamnaceae
Habit: Shrub, Suitable for Hedging
Growth Rate: Fast
Optimal Temperature: Hardy to approximately -12°C to -6°C (USDA Zone 8)
Harmful if Eaten?: No toxic effects reported
Flowers or Berries: Deep blue to purple flower clusters
Hardiness: H4 (Hardy)
Hardiness ratings
All ratings refer to the UK growing conditions unless otherwise stated. Minimum temperature ranges (in degrees C) are shown in brackets
- ○ H1a: under glass all year (>15C)
- ○ H1b: can be grown outside in the summer (10 - 15)
- ○ H1c: can be grown outside in the summer (5 - 10)
- ○ H2: tolerant of low temperatures, but not surviving being frozen (1 to 5)
- ○ H3: hardy in coastal and relatively mild parts of the UK (-5 to 1)
- ○ H4: hardy through most of the UK (-10 to -5)
- ○ H5: hardy in most places throughout the UK even in severe winters (-15 to -10)
- ○ H6: hardy in all of UK and northern Europe (-20 to -15)
- ○ H7: hardy in the severest European continental climates (< -20)
| Spring | Summer | Autumn | Winter | |
|---|---|---|---|---|
| Leaves | ||||
| Flowers | ||||
| Berries |
Spring
Summer
Autumn
Winter
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