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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').

Woollyleaf Ceanothus

Ceanothus tomentosus

Ceanothus tomentosus is a species of shrub in the Buckthorn family (Rhamnaceae) known by the common name Woollyleaf Ceanothus. It is most commonly found in the foothills and canyons of San Diego, Orange and Riverside Counties, north up into the foothills of the Transverse Mountains, and south down into Baja California. The plants formerly called Ceanothus tomentosus var. tomentosus from the Sierra Nevada are actually more closely related to Ceanothus thyrsiflorus (see Burge et. al. Nov. 2011). Ceanothus tomentosus grows in chaparral, coastal sage scrub, coastal strand and foothill woodland plant communities in its range.

It is shrub approaching four meters in maximum height. The evergreen leaves are alternately arranged and have dense, matted hairs on the undersides. The leaves have tiny, hairy teeth. The flower cluster is several centimeters long of deep blue or white flowers. The fruit is a lobed capsule a few millimeters long. It is not hairy and it is sticky when new.

Ceanothus tomentosus is a quintessential chaparral plant in San Diego county. It puts on a great floral display for 1-2 months in winter or occasionally in the spring if rains come late. The flowers are beautiful and abundant particularly in wetter years, and can turn the foothills and canyons blue. So for 1-2 months this plant is especially spectacular. The shiny leaves reflect the sun and look beautiful when backlit. In southern California, it prefers full sun and slopes that retain just a bit more moisture than average - i.e. north facing slopes, slope bottoms, east or west facing slopes with heavier soils and plenty of rocks, or cool coastal conditions. Fast growing to 6-12 feet if happy.

Ceanothus tomentosus doesn't tolerate much if any direct summer water after it's established, and if planted in soils that don't retain enough moisture, it will dry out and die. So site selection is very important here. Best to give it regular water for the first year, and none or almost none thereafter, though it'll do fine if planted adjacent to an irrigated area. If you do give it supplemental water, it should be light and preferably indirect. It will typically drop about half its leaves in the summer and make its own mulch.

Catalina Island Mountain Mahogany

Cercocarpus traskiae

Cercocarpus traskiae, known by the common names Santa Catalina Island mountain-mahogany and Catalina mahogany, is a rare species of plant in the rose family. It is endemic to Catalina Island, one of the southern Channel Islands in Los Angeles County, ]]California]]. It is known from just a single population. It was rare when it was first discovered in 1897 or 1898, when about 40 to 50 plants were counted. When it was federally listed as an endangered species in 1996 there were only six mature plants remaining. It has been called "one of the rarest shrubs in the continental United States" and "one of the rarest trees in North America. " in Wild Boar Gully, an arroyo covered in coastal sage scrub on Catalina. The steep sides of the arroyo contain soils of saussurite gabbro. Cercocarpus traskiae is a large shrub or tree that grows up to 8 meters in height. The leaves have thick, leathery oval blades with serrated edges and woolly-haired undersides. The leathery, woolly texture of the leaves distinguishes it from other Cercocarpus. The inflorescence is a cluster of up to 10 flowers which do not have petals. Plants do not always flower each year. While there are sometimes many seedlings noted, the seedling survival rate and rate of recruitment are quite low. As of 2007, there are only seven adult trees capable of reproduction, all located in Wild Boar Gully, and most of these are very old. The Catalina Island mountain mahogany is threatened by ungulates such as deer, and feral goats and pigs. The goats have been removed from the island, and fencing has been placed to prevent the remaining animals from touching the plants. This rare species hybridizes with its relative, Cercocarpus betuloides, a situation that may lead to genetic swamping of the rare plant. This hybridization may be made more likely by the animals' disturbance of the habitat. Many of the seedlings and saplings growing today may be hybrids. The population of pure Cercocarpus traskiae is not increasing and the species is entirely dependent on human intervention today.

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