California lilac

California lilac should be watered once every 7 to 10 days during hot weather in summer months. In colder months, it is best to water only every 2 to 3 weeks. During hot weather months, water early in the morning so that foliage has ample time to dry out before evening and help protect plants from fungus and other diseases. It is important to water deeply so that water reaches the bottom of the root zone. Afterward, allow the soil to dry before watering again. Try to avoid getting the foliage wet when watering, and maintain a consistent level of moisture instead of infrequent but heavy watering.

California lilacs prefer full sun for the best growth and flowering. In more temperate parts of the country, they should receive 8-10 hours of direct sunlight per day. For hotter, dryer climates, they should receive at least 6 to 8 hours of direct sun per day. In cooler climates, they may need some afternoon shade to protect them from the hot afternoon sun.California lilacs will tolerate partial shade, but may not bloom as heavily. For best results, it is recommended that they receive at least 6 to 8 hours of direct sunlight each day.

California lilac, Ceanothus 'Concha', should be pruned twice each year for best growth and success. Pruning should be done in late spring directly after new growth has occurred and again in late summer before new growth takes place. The late spring pruning should focus on thinning the plant and should remove dead, diseased, or otherwise undesirable branches. The summer pruning should focus on shaping the plant and removing weak, low-hanging, or otherwise unattractive branches. Prune by removing no more than 1 third of the length of each branch to maintain the form of the plant. With proper pruning, your California lilac will be happy and healthy!