Ceanothus

Give Ceanothus a prominent position in a full-sun shrub border, on a slope, or along the open side of a terrace where its broad outline has room to develop. Set it behind lower perennials or groundcovers so the blue bloom is visible above the front of the bed. A single plant can anchor a dry planting; in a repeated row, keep the shrub line back from paths so mature branches do not narrow circulation. Avoid placing it where routine irrigation for nearby plants will keep the root zone wet.^[1]

Space plants 5 feet apart, center to center, for a connected planting that still allows each shrub to establish its own framework. A mature width of about 6 feet means neighboring plants may meet or overlap slightly over time, so reserve a deeper bed than the spacing alone suggests. Leave a clear working edge or path beside the planting for pruning and for reaching the interior without leaning through adjacent plants.

Place Ceanothus in full sun, with well-drained soil and a layout that does not collect winter or irrigation runoff. It needs very little water once established, making it better suited to dry planting zones than to a frequently watered mixed border. During establishment, water deeply as needed, then let the soil dry between waterings rather than maintaining constant moisture.^[1]

Late spring to early summer is the main display period, when the blue flower clusters give this shrub its strongest visual role. Keep nearby early-season plants low enough that they do not conceal the developing bloom. After flowering, retain enough open space around the shrub for light shaping and for the next season’s growth, rather than treating it as a tightly clipped hedge.