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’).