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| Category: Shrub |
| Family: Rhamnaceae (Buckthorns) |
| Origin: California (U.S.A.) |
| Evergreen: Yes |
| Flower Color: Blue |
| Bloomtime: Spring |
| Parentage: (C. papillosus v. roweanus x thyrsiflorus v. griseus) |
| Height: 6-8 feet |
| Width: 6-12 feet |
| Exposure: Full Sun |
| Irrigation (H2O Info): Low Water Needs |
| Winter Hardiness: 10-15° F |
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Ceanothus 'Cynthia Postan' (Cynthia Postan Ceanothus) - A dense shrub 6 to 8 feet tall and slightly wider with small, glossy, dark green leaves and violet blue flowers emerging from reddish buds in the late spring. The flowers can completely cover the plant at peak bloom. ‘Cynthia Postan’ is somewhat intermediate between two more commonly grown Ceanothus papillosus hybrids, Ceanothus 'Concha' and C. 'Wheeler Canyon'. It resembles 'Concha' more in form, although it is slower growing, and has flowers that are more aligned with those of 'Wheeler Canyon'. Plant in full sun. Little irrigation required. Plants along the coast have demonstrated considerable tolerance of heavy soils. Hardy to 10° F. We originally discovered this plant when investigating differences we had noted in plants being grown in the nursery trade labeled Ceanothus 'Wheeler Canyon.' We are thankful to Dave Fross at Native Sons Nursery for bringing this great cultivar to our attention. It was selected at the University Botanic Garden in Cambridge, England from seed collected by Lady Cynthia Postan from a plant of Ceanothus papillosus var. roweanus growing in the Regional Parks Botanic Garden in Berkeley, CA. The genus name comes from the Greek word keanthos which was used to describe a type of thistle and meaning a "thorny plant" or "spiny plant" and first used by Linnaeus in 1753 to describe New Jersey Tea, Ceanothus americanus.
This description of this plant is based on our research and our observations of it growing at the nursery, in our own garden and in other gardens. We always appreciate receiving feedback of any kind from those who have any additional information about this plant, particularly if they disagree with what we have written or have additional cultural tips that would aid others growing Ceanothus 'Cynthia Postan' .
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