Home
Advanced Search Map Locator
View Settings
Nurseries Carrying this Plant Add Current Plant To List Edit Current Plant
Show all Photos

Butterflies My Plant Lists Nurseries Planting Guide Contact Calscape About Calscape
Tap map to see plants native to location
Order by Popularity Order by Common Name Order by Scientific Name Order by # of Butterflies Hosted
Show nursery cultivars Hide nursery cultivars
Show plants not in nurseries Hide plants not in nurseries
Grid view Text view
Loading....
Blueblossom Ceanothus
Ceanothus thyrsiflorus
  
About Blueblossom Ceanothus (Ceanothus thyrsiflorus) 44 Nurseries Carry This Plant Blueblossom or Blue blossom Ceanothus is one of the most popular species of Ceanothus in landscaping applications. It varies dramatically in form and size over its natural range, with some plants growing fairly upright to 30 feet and others growing in a mounding form to only 2-3 feet tall. Blueblossom Ceanothus is evergreen, with leaves range from bright green to dark green. It has small flowers that are produced in a dense, puff-shaped clusters, that are white, light blue, dark blue or purple. They bloom in the winter or spring, and then mature into a dry, three-lobed seed capsule. Its flowers are important for bees and butterflies, and its seed pods are an important food source for birds and small mammals. Blueblossom grows in full sun or part shade. In the hotter, inland part of its range, it does better with more shade, on northern slopes, and if closer to an irrigated or a naturally moister area. In the cooler coastal part of its range, it prefers more sun and can tolerate drier locations. In general, if you water mature Ceanothus in the summer, they will usually be short-lived. Best to choose a Ceanothus native to your location, and stop direct watering after 1-2 years. There are two recognized varieties in the wild, Ceanothus thyrsiflorus var. thyrsiflorus and Ceanothus thyrsiflorus var. griseus (formerly considered a separate species).

Popular nursery varietals of Ceanothus thyroflorus are:
- Arroyo de la Cruz, which grows to 4 feet tall and 8 feet wide in a dense form, has small leaves, blue flowers and grows fast. It was taken from cuttings from a plant in San Luis Obispo
- Skylark, which grows to 5 feet tall and 5 feet wide in a compact form, has dark green leaves, profuse dark blue flowers, and has a long flowering season. It was cloned from cuttings from a plant in Mendecino.
- Snow Flurry, which can reach huge sizes, grows quickly up to 30 feet tall and 30 feet wide, with shiny dark green leaves and profuse white flowers. It was cloned from cuttings from a plant in Monterey
- Creeping Blueblossom, which grows slowly to 2-3 feet high, and up to 15 feet in diameter. It has a dense, mounding form, small, glossy, dark green leaves and light blue flowers. It is native in northern and central California, and southern California down to Santa Barbara.

Tolerant of recycled water.
Plant Description
Plant Type
Plant Type
Shrub

Size
Size
2 - 30 ft tall
2 - 40 ft wide

Form
Form
Mounding, Spreading, Upright Columnar, Weeping

Growth Rate
Growth Rate
Fast, Moderate

Dormancy
Dormancy
Evergreen

Fragrance
Fragrance
Fragrant - Pleasant, Slight

Flower Color
Flower Color
Blue, White, Green

Flowering Season
Flowering Season
Winter, Spring

Wildlife Supported
 
Insects, especially bees and butterflies, are attracted to the flowers. Plants in the Ceanothus genus are host plants to the Spring Azure, Echo Blue, Pacuvius Duskywing, California Tortoiseshell, Pale Swallowtail, and Hedgerow Hairstreak butterflies.

 

Landscaping Information
Sun
Sun
Part Shade

Moisture
Moisture
Low

Summer Irrigation
Summer Irrigation
Max 1x / month once established

Nurseries
Nurseries

Ease of Care
Ease of Care
Moderately Easy

Cold Tolerance
Cold Tolerance
Tolerates cold to 15° F

Soil Drainage
Soil Drainage
Fast, Medium, Slow

Soil Description
Soil Description
Reported to tolerate clay and sand, but Ceanothus generally do best in well drained soil. Do not fertilize or amend.. Soil PH: 5.0 - 7.0

Common uses
Common uses
Groundcovers, Hedges, Bank Stabilization, Bird Gardens, Butterfly Gardens, Bee Gardens

Companion Plants
Companion Plants
Flannelbush (Fremontodendron spp.), Bush Poppy (Dendromecon rigida), Manzanitas (Arctostaphylos spp.), Coast Buckwheat (Eriogonum latifolium), Golden Yarrow (Eriophyllum confertiflorum), Sticky Monkeyflower (Mimulus aurantiacus), and various Rhus and Ribes species

Maintenance
Maintenance
Tip pruning helps maintain a compact shape. Larger shrubs benefit from removal of leafless interior branches to open up structure and encourage new growth. Pruning is best done in dry season to prevent infection.

Propagation
Propagation?
For propagating by seed: Hot water and 2-3 mos. stratification.

Sunset Zones
Sunset Zones?
6, 7, 8, 9, 14*, 15*, 16*, 17*, 19, 20*, 21*, 22*, 23*, 24*

Natural Setting
Site Type
Site Type
Chaparral, redwood forest, and mixed woodland slopes and canyons below 2,000 ft. primarily along the coast and foothills of the Coast Ranges from Del Norte County to Monterey County, with scattered locations south and inland

Climate
Climate
Annual Precipitation: 6.3" - 123.6", Summer Precipitation: 0.17" - 3.72", Coldest Month: 36.6" - 54.4", Hottest Month: 56.0" - 78.8", Humidity: 0.01" - 29.51", Elevation: 3" - 6180"


Sources include: Wikipedia. All text shown in the "About" section of these pages is available under the Creative Commons Attribution-ShareAlike License. Plant observation data provided by the participants of the California Consortia of Herbaria, Sunset information provided by Jepson Flora Project. Propogation from seed information provided by the Santa Barbara Botanical Garden from "Seed Propagation of Native California Plants" by Dara E. Emery. Sources of plant photos include CalPhotos, Wikimedia Commons, and independent plant photographers who have agreed to share their images with Calscape. Other general sources of information include Calflora, CNPS Manual of Vegetation Online, Jepson Flora Project, Las Pilitas, Theodore Payne, Tree of Life, The Xerces Society, and information provided by CNPS volunteer editors, with special thanks to Don Rideout. Climate data used in creation of plant range maps is from PRISM Climate Group, Oregon State University, using 30 year (1981-2010) annual "normals" at an 800 meter spatial resolution.

Links:   Jepson eFlora Taxon Page  CalPhotos  Wikipedia  Calflora


Sign in to your Calscape Account X




Once signed in, you'll be able to access any previously saved plant lists or create new ones.

Email Address
Password

Sign In