Illustration
California Lilac
Ceanothus 'Concha'
Also comes in purple.
California Lilac blooms from April through May.
Months here are Northern Hemisphere months; in the Southern Hemisphere, shift them by six months.
Growing California Lilac
Plant it in full sun. It prefers low water. It is hardy in USDA zones 8–11. Expect it to reach about 8 ft tall and 10 ft wide at maturity, in roughly 3 years (not yet checked).
No toxicity note is on file for California Lilac. That is not a clearance: check its safety for people and pets before planting.
What this means
Generated by an earlier AI feature of BloomsEye and not yet checked against outside sources, its scientific name included, so treat every fact above as a starting point. An audit keeps its values consistent with the rest of the library, which is not the same as being right. The source-by-source check is working through the whole library in the open, and a checked plant says so in this row.
When to plant California Lilac
Plant California Lilac in early spring as soon as the soil is workable, or in early fall at least six weeks before your first frost, so roots establish in cool weather. In zone 9, the middle of its hardy zones 8 to 11, spring means January to March and fall means October or November. Once settled, it blooms from April to May.
Month-by-month timing for your zone is on the planting calendar; if you garden near zone 9, the middle of this plant's hardy range, start with zone 9 in January. Derived from the plant's category, zones and bloom months plus typical zone frost dates, not checked separately.
How big does California Lilac get?
8 fttall5 ft 7 inan adult10 ftwideSee California Lilac in a garden plan: the planner shows it in 3D beside everything else you add, growing toward this size over the years.
How far apart to plant California Lilac
Derived from the mature spread above by a fixed rule, not checked separately: spacing is the spread, center to center.
Give California Lilac about 10 ft of clear ground in every direction, measured from its center. It is one plant with room around it, not a row, and a raised bed is too small for it.
Add California Lilac to a garden plan and the planner draws it at its full width, so you see the spacing before you buy.
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Design a garden with this
Drop this plant onto a 3D plan, see how it fills in, and watch your whole garden bloom across the year.