How to Water Californian lilac 'Cynthia Postan'?
Moderate regular watering, allowing brief slight drying between soakings

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
Moderate regular watering, allowing brief slight drying between soakings