What Are the Moisture Requirements for Californian lilac 'Cynthia Postan'?
Well drained

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
Well drained