How to Propagate Californian lilac 'Cynthia Postan'?
Root semi-ripe cuttings in mid- to late summer

Californian lilac 'Cynthia Postan' · Ceanothus 'Cynthia Postan'
Grow in fertile, well-drained soil in full sun with shelter from strong, cold winds. Lime tolerant but may become chlorotic on shallow chalk soils. See ceanothus cultivation
Root semi-ripe cuttings in mid- to late summer