Marin Master Gardeners
University of California
Marin Master Gardeners

Plant Guide

Ceanothus 'Concha'

Common Name
California Lilac 'Concha'
CA Native
California Native
Plant Type
Shrub
Size
6' -7' x 6' - 8'
Flower Color
Dark Blue
Bloom Time
  • Spring
Leaves
Dark Green
Evergreen
Evergreen
Deer Resistant
Occasionally Damaged
Wildlife Value
  • Attracts Beneficial Insects
  • Bees
  • Bird Habitat
Growth Rate
Fast
Hardiness
Hardy
Adverse Growth Factors
None
Special Features
  • Low Maintenance
  • Showy Flowers
Water Use
  • Drought Tolerant
  • Low
Soil pH
6.5-7.5 (neutral)
Exposure
  • Full Sun
  • Partial Shade
  • Shade
Soil Type
Not Particular
Drainage
Well Drained
Description and Cultural Plant Tips

Ceanothus 'Concha' is one of the oldest Ceanothus hybrids. It is also considered one of the best hybrids out there because of the 1 inch long dark blue flowers and arching branches. These shrubs will survive for 15 -25 years as long as it is in well-drained soil with little to no summer water. Looks great with other natives such as manzanitas, toyons and coffeeberry. It is often used as a specimen shrub, as a dense hedge, on hillsides for erosion control, or for a naturalized garden.

Plant slightly above soil grade in well-drained soil in a suuny, to part shade location. Ceanothus is tolerant of a wide range of soils, including alkaline. Do not disturb the root ball when planting. Do not add fertilzers or amendments. Plant in the fall to take advantage of the winter rains. May need to water during the 1st summer but after that do not need water. Mulch the top of the soil in a 3 foot circle around the plant.

Ceanothus is frequented by native benificials and bees. When fully grown it is used as bird habitat.

Ceanothus is suseptible to root rot caused by water mold organisms. Male sure that this plant receives little to no water in the summer months.   Aphids and whiteflies may also be aproblem but are easy to control.

Master Gardener Comments
Varietals

C. griseus horizontalis 'Yankee Point' -  3' - 5' tall with medium blue 1 inch clusters

C. 'Dark Star'  -  5' - 6' tall with dark cobalt blue 1.5 inch flower clusters. Small leaves make them more resistant to deer browsing

C. rigidus ' Snowball' - 6 ' tall with white 3/4 inch flower clusters

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