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| Category: Shrub |
| Family: Rhamnaceae (Buckthorns) |
| Origin: California (U.S.A.) |
| Evergreen: Yes |
| Flower Color: Dark Blue |
| Bloomtime: Spring |
| Synonyms: [Ceanothus 'Darkest Blue'] |
| Parentage: (C. foliosus x griseus) |
| Height: <1 foot |
| Width: 4-6 feet |
| Exposure: Sun or Shade |
| Summer Dry: Yes |
| Irrigation (H2O Info): Low Water Needs |
| Winter Hardiness: 15-20° F |
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Ceanothus 'Centennial' (Centennial Ceanothus) – A low-spreading groundcover growing 6 to 12 inches tall by 4 to 8 feet wide. The tiny, dark green leaves have a glossy surface that gives a polished backdrop to the intensely blue, button-like flower clusters in spring. Plants accept considerable shade and are effective groundcovers at the outer edges of a live oak canopy. Also useful spilling down slopes or cascading over the edge of a decorative pot. This selection has proven somewhat problematic and short-lived in some mass plantings in the Santa Barbara area for reasons that are not clear. We recommend planting in well-drained soils rather than heavy or alkaline soils. In central and southern California gardens, plants will need occasional supplemental irrigation, especially when planted away from the coast. Hardy to 15° F. We originally grew this cultivar under the name 'Darkest Blue'. ‘Centennial’ was officially named and introduced in 1992 and was selected from seed collected along the Sonoma County coast by Roger Raiche, horticulturist at UC Botanical Garden in Berkeley at the time. 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 information about Ceanothus 'Centennial' displayed is based on research conducted in our library and from reliable online resources. We will also note observations that we have made about it as it grows in the gardens in our nursery and those elsewhere, as well how the crops have performed in containers in our nursery field. We will also incorporate comments we receive from others, and we welcome hearing from anyone with additional information, particularly if they can share cultural information that would aid others in growing it.
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