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Blueblossom Ceanothus

Ceanothus thyrsiflorus

Blueblossom ceanothus (Ceanothus thyrsiflorus) is a large shrub or small tree in the Buckthorn family (Rhamnaceae). Evergreen, glossy leaves range from bright green to dark green. Small flower clusters range in color from light blue, dark blue, or blue-violet; occasionally a specimen with pale blue-white flowers can be found. Varying dramatically in form and size over its natural range, some plants grow fairly upright to 30 feet and others grow in a mounding form to only 2-3 feet tall. Flowers appear in late winter or early spring, and are an important early source of food for pollinators. Bees are especially attracted to the flowers. Three-lobed seed capsules are eaten by birds and small mammals. 


Blueblossom grows primarily along the coast and coastal mountains, in many different habitats, in full sun or part shade. In the hotter, inland part of its range, it can be found growing in the shade of northern slopes, under mature woodland canopies, or closer to an irrigated or a naturally moist area. In the cooler, coastal areas, it prefers more sun and dry locations.


In the garden, if you continue to provide summer irrigation after it is established, ceanothus species will usually be short-lived. Choose a ceanothus which is native to your location, then stop irrigating after year two or three. Blueblossom can be used alone as a backdrop to shorter shrubs and perennials, or as an evergreen hedge. Prune it to one trunk for a treeform, or keep it natural for a large shrub. When in bloom, blueblossom is almost entirely covered in flowers, creating a dreamy blue haze in the landscape. There are many cultivars available at nurseries all over the state. 

Carmel Ceanothus

Ceanothus thyrsiflorus var. griseus

Carmel ceanothus (Ceanothus thyrsiflorus var. griseu) is a flowering shrub available in many named cultivars. In winter to spring its evergreen leaves are densely covered with small blue or purple flowers. This native plant is endemic to coastal California. It grows in the chaparral, coastal scrub, and closed-cone-pine forest plant communities.

The flowers become food sources for larvae of some butterfly and moth species, bees, and other beneficial insects. 

Carmel ceanothus is the most popular ceanothus for California garden. Gardeners find it easy to grow and fast-growing. It will take a wide range of soils and can tolerate summer water up to twice a week.

Take care with pruning and do not prune heavily. You should not cut back into old wood. Instead, promote new shoots by pruning the tip of stems where growth is active. Also, you can trim off dead branches on the interior of the shrub to improve its shape and attractiveness. 

Cultivars of Carmel ceanothus have variable leaf and flower colors and grow to different heights and widths.  Calscape features:

Diamond heights mountain lilac (Ceanothus thyrsiflorus var. griseus 'Diamond Heights') 

Kurt Zadnik Carmel ceanothus (Ceanothus thyrsiflorus var. griseus 'Kurt Zadnik') 

Louis Edmunds Carmel ceanothus (Ceanothus thyrsiflorus var. griseus 'Louis Edmunds') 

Point Sal Carmel creeper (Ceanothus thyrsiflorus var. griseus 'Point Sal') 

Santa Ana Carmel ceanothus (Ceanothus thyrsiflorus var. griseus 'Santa Ana') 

Yankee Point Carmel Ceanothus (Ceanothus thyrsiflorus var. griseus 'Yankee Point') 

Creeping Blueblossom

Ceanothus thyrsiflorus var. thyrsiflorus

Creeping Blueblossom (Ceanothus thyrsiflorus var. thyrsoflorus) is a the low growing form and variety of the native shrub and tree Ceanothus thyrsiflorus. It native range is coastal central and northern California, extending from northern Santa Barbara County to near the Oregon border, growing 1- 5 miles from the shore. The other variety of this species, Ceanothus thyrsiflorus var. griseus (Carmel Ceanothus) is much more variable in form and is native to habitats closer to the coast.
Creeping Blueblossom was previously classified as Ceanothus thyrsiflorus var. repens.

Creeping Blueblossom has profuse attractive sky blue flowers and makes an excellent ground cover plant. It prefers full sun to part shade in cooler coastal environments, and part shade to full shade in hotter and drier inland environments. It tolerates occasional light summer water, but is quite drought tolerant. It grows well in many different soil types, from clay to sand, and can tolerate poorly draining and fast draining conditions.

Cultivars in the nursery trade include:
Ceanothus thyrsiflorus var. thyrsiflorus 'Taylor's Blue' (Taylors Blue Ceanothus). This is a shrub ground cover growing 2-3 feet tall by 10-15 feet wide. It was introduced in the 1950s as Ceanothus thyrsiflorus 'Louis Edmunds' by the Saratoga Horticultural Foundation, from a plant in nurseryman Ken Taylor's natives garden in Aromas, originally from the garden of nurseryman Louis L. Edmunds. It was previously named and is sometimes still sold as C. t. var. repens 'Taylor's Blue'.
Ceanothus thyrsiflorus var. thyrsiflorus 'Louis Edmunds' (Louis Edmunds Blue Blossom). This is a prostrate ground cover growing 6 inches tall by 6 to 8 feet wide, and is the lowest cultivated form of C. t. var. thyrsiflorus. It introduced by Rancho Santa Ana Botanic Garden (California Botanic Garden) in 1958 as Ceanothus griseus 'Louis Edmunds' from a plant given them by Louis L. Edmunds, who operated the Louis Edmunds Native Plant Nursery in Danville.
This is not the same plant as the cultivar Ceanothus thyrsiflorus var. griseus 'Louis Edmunds' (Louis Edmunds Carmel Ceanothus) nor the formerly named Ceanothus thyrsiflorus 'Louis Edmunds' (currently C. t. var. thyrsiflorus 'Taylors Blue').

California Aster

Corethrogyne filaginifolia

Corethrogyne filaginifolia (syn. Lessingia filaginifolia) is a species of flowering plant in the daisy family known by the common names Common Sandaster and California Aster. The taxonomy of this plant and certain relatives is currently changing; recently the Corethrogynes have been grouped together under the name Lessingia filaginifolia, and then moved back to genus Corethrogyne as a single species with many synonyms.

It is native to western North America from the southwestern corner of Oregon to Baja California, where it is a common member of many plant communities, including chaparral and woodlands, forests, scrub, grasslands, and the serpentine soils flora.

This is a robust perennial herb or subshrub producing a simple to multibranched stem approaching a meter in maximum length or height. The densely woolly leaves are several centimeters long and toothed or lobed low on the stem and smaller farther up the stem.

The flower cluster is a single flower head or array of several heads at the tips of stem branches. The head is lined with narrow, pointed, purple-tipped phyllaries which curl back as the head matures. Inside are many purple, lavender, pink, or white ray florets and a center packed with up to 120 tubular yellow disc florets. The fruit is an achene with a pappus of reddish bristles on top.

California Aster appears to do best in rocky slopes and sloping rock gardens. They often don't do as well on flat areas. On dry slopes surrounded by rocks, the plant will usually stay beautiful year round. If happy, it will often reseed and pop up in nearby rocky places.

This plant is very drought tolerant if situated properly. It is not tolerant of summer water, which will often kill it after its first year. California Aster is available in nurseries primarily in low-growing, spreading varieties. 'Silver Carpet' is one of the most beautiful and popular.

Beaked Hazelnut

Corylus cornuta

California hazel (Corylus cornuta var. californica) -- also commonly called beaked hazelnut or California hazelnut -- is an evergreen shrub in the Birch family (Betulaceae). Delicate stems are clothed in velvety birch-like leaves which turn golden yellow in autumn. Springtime brings dangling cream-colored catkins before the leaves appear, which can resemble tiny ornaments when viewed from a distance in a forest. Although ruby red, the flowers are quite small, and escape notice unless one is looking for them.

Butterflies and moths are attracted to the flowers and Early Hairstreak butterflies use the plant to lay their eggs. Wild birds feed on the high-protein winter buds and spring catkins. Hazelnuts are famous for their fruit, which is a delicious nut that is enclosed in a papery, beaked-shaped husk. Our native hazelnut, while not as productive as the commercial crop (European Hazelnut, Corylus avellana), may require protection from wildlife if one wishes to grow it for its nuts.

California hazel thrives as an understory shrub or small tree in Woodland habitats, flourishing in part to full shade and slightly moist, well-drained soil near creeks, streams, or under dense tree canopies. Gardeners who are interested in growing their own food using Permaculture or Food Forest methods, can include this plant in the shrub layer. For those who wish to attract wildlife, this is also a wonderful choice. California hazel adds a delicate, ethereal quality to a woodland garden and those with shady yards will find this shrub to be a great addition to their landscapes.

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