California lilac
Ceanothus spp.
A haze of blue flowers that bees can hear from across the street, and it fixes nitrogen.
Hardiness: zones 7 to 10
Light: full sun
Size: about 6 ft tall, 8 ft wide
From: California
Drought-hardy once established
Here: Hardy in the Lake Erie shore climate (zone 6b to 7a), so it can live outdoors in the ground.
Good for: fixing nitrogen in the soil, pollinators, butterfly and moth caterpillars.
Native to: California, Pacific Northwest. Hardy in zones 7 to 10.
The story
California lilac is not a lilac, but in March whole hillsides turn blue with it. Its roots host bacteria that fix nitrogen, and the flowers lather into a mild soap when rubbed with water.
Planting
Full sun and fast drainage. Plant small plants in fall; big ones settle poorly.
Growing
Water the first summer, then little or none. Tip-prune after bloom; don't cut into old wood.
Harvest and use
A feast for bees and butterflies and a host for several California butterflies. Quail eat the seed.
What to watch for
Summer water shortens its life. Even well grown, most kinds last ten to fifteen years.
See if California lilac fits your yard
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More native and wild plants
General guidance, not professional advice. Conditions vary by yard and year; for local specifics ask your county extension office. Never eat a wild plant you cannot identify with certainty. Traditional uses are shared as history, not medical advice. © 2026 Sean Priest · Irie Orchard. Terms & credits · Privacy · Home