Alphabetical Plant Listing

Ceanothus thyrsiflorus (Blue Blossom)

Blueblossom, Bluebrush, Blue Blossom


The hardiest of the California wild lilacs, Ceanothus thyrsiflorus (Blue Blossom) is a large, upright, evergreen shrub noted for its large fluffy clusters, 8 in. long (20 cm), packed with pale to dark blue flowers dotted with yellow stamens. Blooming in mid spring to early summer, the flowers are so profuse that they literally cover the shrub, transforming the plant in an explosion of blue. The blossoms are borne on arching branches clad with small, lustrous green, oval leaves. Fast-growing, Blue Blossom is native to the coastal chaparral and rocky, maritime, open and wooded slopes, bluffs and flats along the western coast of the United States from California north to Oregon. Its flowers are important for bees, moths and butterflies, and its seed pods are an important food source for birds and small mammals. Adding exquisite beauty to the landscape, it can be grown in sunny shrub borders, screens, hedges, against walls and open slopes.

  • Grows up to 15-20 ft. tall and wide (450-600 cm).
  • Thrives in average, moist to dry, well-drained soils in full sun. Appreciates afternoon shade in hot summer areas. Tolerant of salt spray, and poor, shallow, rocky to sandy soils. Established plants need little summer water (once or twice a month). Drought tolerant once established.
  • Excellent choice for wall-side borders, beds and borders, city gardens, coastal gardens, cottage gardens, Mediterranean gardens.
  • Prune immediately after flowering.
  • Propagate by seed or semi-hardwood cuttings.
  • Keep an eye out for scale insects, honey fungus and Phytophthora root disease.
  • Native to California, Oregon.

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Requirements

Hardiness 7 – 11
Heat Zones 3 – 10
Climate Zones 5, 6, 7, 8, 9, 14, 15, 16, 17, 18, 19, 20, 21, 22, 23, 24
Plant Type Shrubs
Plant Family Ceanothus - California Lilac
Exposure Full Sun, Partial Sun
Season of Interest Spring (Mid,Late)
Summer (Early)
Height 15' – 20' (4.5m – 6m)
Spread 15' – 20' (4.5m – 6m)
Water Needs Low, Average
Maintenance Low
Soil Type Clay, Loam, Sand
Soil pH Alkaline, Neutral
Soil Drainage Moist but Well-Drained, Well-Drained
Characteristics Showy, Evergreen
Native Plants United States, California, Pacific Northwest, Oregon
Tolerance Clay Soil, Drought, Dry Soil, Rocky Soil, Salt
Attracts Birds, Butterflies
Garden Uses Banks and Slopes, Beds and Borders, Hedges and Screens, Wall-Side Borders
Garden Styles City and Courtyard, Coastal Garden, Informal and Cottage, Mediterranean Garden

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By Iv-olga, Shutterstock

While every effort has been made to describe these plants accurately, please keep in mind that height, bloom time, and color may differ in various climates. The description of these plants has been written based on numerous outside resources.


Requirements

Hardiness 7 – 11
Heat Zones 3 – 10
Climate Zones 5, 6, 7, 8, 9, 14, 15, 16, 17, 18, 19, 20, 21, 22, 23, 24
Plant Type Shrubs
Plant Family Ceanothus - California Lilac
Exposure Full Sun, Partial Sun
Season of Interest Spring (Mid,Late)
Summer (Early)
Height 15' – 20' (4.5m – 6m)
Spread 15' – 20' (4.5m – 6m)
Water Needs Low, Average
Maintenance Low
Soil Type Clay, Loam, Sand
Soil pH Alkaline, Neutral
Soil Drainage Moist but Well-Drained, Well-Drained
Characteristics Showy, Evergreen
Native Plants United States, California, Pacific Northwest, Oregon
Tolerance Clay Soil, Drought, Dry Soil, Rocky Soil, Salt
Attracts Birds, Butterflies
Garden Uses Banks and Slopes, Beds and Borders, Hedges and Screens, Wall-Side Borders
Garden Styles City and Courtyard, Coastal Garden, Informal and Cottage, Mediterranean Garden

Great Plant Combination Ideas with Ceanothus - California Lilac

Guides with Ceanothus - California Lilac

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