Alphabetical Plant Listing

Ceanothus oliganthus (Hairy Ceanothus)

Explorer's Bush, Explorer's-bush, Hairy Ceanothus, Coast Ceanothus, Ceanothus divaricatus, Ceanothus hirsutus, Ceanothus oliganthus var. oliganthus, Ceanothus oliganthus var. orcuttii, Ceanothus orcuttii


Ceanothus oliganthus (Hairy Ceanothus) is an upright, intricately branched, evergreen shrub with a spreading crown. It is prized for its abundant rounded to cylindrical clusters packed with pale to purple-blue flowers in early spring to early summer. The flowers are so profuse that they literally cover the shrub, transforming the plant in an explosion of blue. The evergreen leaves are small, 1.5 in. long (4 cm), broadly oblong, with a leathery texture. They are dark green on top, paler and hairy on the underside, and are edged with hairy teeth. Attractive to bees and butterflies, the flowers give way to capsules. When they dehisce, the ovary pops off and the seeds are explosively ejected.. Hairy Ceanothus is endemic to coastal California, and typically found on ridges and upper slopes with shallow, well-drained soils. Suitable for revegetation or habitat restoration, Hairy Ceanothus is a valuable plant for use in hedgerows or for bank stabilization. It is an important plant for honey bees and honey production. This species is an important deer browse and provides protective cover for a number of species, including deer and a variety of chaparral rodents.

  • Grows up to 10 ft. tall (300 cm) and 12 ft. wide (360 cm).
  • Thrives in shallow, gravelly, sandy, well-drained soils in full sun. Highly drought tolerant. Established plants need little summer water (max once per month). Tolerates clay soil.
  • Excellent choice for beds and borders, hedges, coastal gardens, cottage gardens, Mediterranean gardens or bank stabilization.
  • Propagate by seed (hot water treatment).
  • No serious pest or disease issues. Plants may suffer branch dieback during severe drought years.
  • Native to California.

Not sure which Ceanothus - California Lilac to pick?
Compare All Ceanothus - California Lilac

Buy Ceanothus oliganthus (Hairy Ceanothus)

Requirements

Hardiness 7 – 10
Climate Zones 5, 6, 7, 8, 9, 14, 15, 16, 17, 18, 19, 20, 21, 22, 23, 24
Plant Type Shrubs
Plant Family Ceanothus - California Lilac
Exposure Full Sun
Season of Interest Spring (Early,Mid,Late)
Summer (Early)
Height 8' – 10' (240cm – 3m)
Spread 10' – 12' (3m – 3.6m)
Spacing 360" (900cm)
Water Needs Low
Maintenance Low
Soil Type Loam, Sand
Soil pH Acid, Alkaline, Neutral
Soil Drainage Well-Drained
Characteristics Fragrant, Showy, Evergreen
Native Plants United States, California
Tolerance Clay Soil, Drought
Attracts Birds, Butterflies
Garden Uses Banks and Slopes, Beds and Borders, Hedges and Screens
Garden Styles Coastal Garden, Informal and Cottage, Mediterranean Garden

Buy Plants

Great Plant Combination Ideas with Ceanothus - California Lilac

Guides with Ceanothus - California Lilac


Mitch Barrie, Flickr, Jared Quentin, Shutterstock

While every effort has been made to describe these plants accurately, please keep in mind that height, bloom time, and color may differ in various climates. The description of these plants has been written based on numerous outside resources.


Requirements

Hardiness 7 – 10
Climate Zones 5, 6, 7, 8, 9, 14, 15, 16, 17, 18, 19, 20, 21, 22, 23, 24
Plant Type Shrubs
Plant Family Ceanothus - California Lilac
Exposure Full Sun
Season of Interest Spring (Early,Mid,Late)
Summer (Early)
Height 8' – 10' (240cm – 3m)
Spread 10' – 12' (3m – 3.6m)
Spacing 360" (900cm)
Water Needs Low
Maintenance Low
Soil Type Loam, Sand
Soil pH Acid, Alkaline, Neutral
Soil Drainage Well-Drained
Characteristics Fragrant, Showy, Evergreen
Native Plants United States, California
Tolerance Clay Soil, Drought
Attracts Birds, Butterflies
Garden Uses Banks and Slopes, Beds and Borders, Hedges and Screens
Garden Styles Coastal Garden, Informal and Cottage, Mediterranean Garden

Great Plant Combination Ideas with Ceanothus - California Lilac

Guides with Ceanothus - California Lilac

Plant Calculator

How many Ceanothus oliganthus (Hairy Ceanothus) do I need for my garden?

%
ft
ft

Your Shopping List

Plant Quantity
Ceanothus oliganthus (Hairy Ceanothus)

Find your Hardiness Zone

Find your Climate Zone

Find your Heat Zone

Join Gardenia.net

Create a membership account to save your garden designs and to view them on any device.

Becoming a contributing member of Gardenia is easy and can be done in just a few minutes. If you provide us with your name, email address and the payment of a modest $25 annual membership fee, you will become a full member, enabling you to design and save up to 25 of your garden design ideas.

Join now and start creating your dream garden!

Create a New Collection

Optional. For your reference.


Move Selected Plants to a Different Collection


Delete Collection

This field is required.

Rename Collection

This field is required.