Ceanothus, Blueblossom, Blue Brush, California Lilac 'Skylark'

Ceanothus thyrsiflorus

Family: Rhamnaceae
Genus: Ceanothus (see-an-OH-thus) (Info)
Species: thyrsiflorus (thur-SEE-flor-us) (Info)
Cultivar: Skylark



Water Requirements:

Drought-tolerant; suitable for xeriscaping

Sun Exposure:

Full Sun



Foliage Color:

Unknown - Tell us


4-6 ft. (1.2-1.8 m)


4-6 ft. (1.2-1.8 m)


USDA Zone 8a: to -12.2 C (10 F)

USDA Zone 8b: to -9.4 C (15 F)

USDA Zone 9a: to -6.6 C (20 F)

USDA Zone 9b: to -3.8 C (25 F)

USDA Zone 10a: to -1.1 C (30 F)

USDA Zone 10b: to 1.7 C (35 F)

Where to Grow:

Unknown - Tell us


Unknown - Tell us

Bloom Color:

Medium Blue

Bloom Characteristics:

Unknown - Tell us

Bloom Size:

Unknown - Tell us

Bloom Time:

Late Spring/Early Summer

Other details:

Unknown - Tell us

Soil pH requirements:

Unknown - Tell us

Patent Information:

Unknown - Tell us

Propagation Methods:

Unknown - Tell us

Seed Collecting:

Unknown - Tell us


This plant is said to grow outdoors in the following regions:

San Francisco, California

Fort Mill, South Carolina(2 reports)

Bremerton, Washington

Gardeners' Notes:


On May 20, 2014, Pianokey59 from Fort Mill, SC wrote:

I uploaded a picture of a Skylark that I took on May 19, 2014. I purchased it from ForestFarm Pacifica in Oregon in May 2012. Nearly all the plant literature I read said that it would fail miserably in Southeast gardens because of the summer heat, humidity and heavy clay soil. I live just south of Charlotte NC and have all of these. We had a very wet summer last year with an annual rain total approaching 50". We had the coldest winter in 37 years with low temperatures on two separate nights of 5 and 6. I have to give ForestFarm credit for raising extremely healthy stock but I don't think the "experts", whoever they are, give this plant enough credit for being tough and adaptable. We had a Zone 7 winter last year and while there was some, not a lot, leaf burn, the Skylark Ceanothus bounce... read more


On Mar 26, 2014, MulchingMan from Eugene, OR wrote:

This is a really nice plant that roots and grows vigorously. Foliage and flowers are nice as well. However, despite being somewhat tolerant of summer water, it has its limits. We had an unusually-wet September last year where we received 7" of rain during the last two weeks. My 'Skylark' responded by dropping most of its root system. It'll work in the Pacific Northwest in most years, but be prepared to take occasional losses during those freak weather events.


On Sep 29, 2010, suewylan from North Fork, CA (Zone 7b) wrote:

Ceanothus thyrsiflorus 'Skylark'


On Feb 26, 2008, bastowp from Brighton,
United Kingdom wrote:

I grow 1000's of ceanothus a year through work, and I'd say this is the best ceanothus variety on the UK market. Its very vigourous but has lovely shiny dark green foliage all year round.

It requires a hard prune after flowering. Cut away the seeding heads after flowering.

The UK is Zone 8 and all the ceanothus varities we grow cope well throughout the UK.


On Mar 17, 2007, berrygirl from Braselton, GA (Zone 8a) wrote:

Ceanothus thyrsiflorus 'Skylark' BLUE BLOSSOM EG (z7) (Hon,Fra,Bfly)
Profuse dark-blue flowers cover this shrub (to 3-6'tall x 5'wide) in e.summer &, added bonus (as if one was needed!): this tolerates summer water better than most Cea.--better prospect for eastern gardens?.S/M-D


On Jun 29, 2006, fluffygrue from Manchester,
United Kingdom (Zone 8a) wrote:

Lovely little Ceanothus. Unlike some other cultivars, the flowers on this seem to go well with the foliage colour, as they're a paler blue than most. Seems to flower much longer than others.