Irrigating Oaks in the Summer

Coast live oaks (Quercus agrifolia) are drought-tolerant native trees well-adapted to California’s dry summers. In most cases, mature trees do not require supplemental irrigation and can be harmed by excessive summer watering. However, in developed landscapes or during extended drought, careful summer irrigation may be necessary. Water deeply but infrequently—ideally once every three to four weeks—focusing outside the dripline to encourage deep root growth and avoid root rot. Use soaker hoses or low-flow emitters to deliver water slowly and avoid overhead watering, which can promote fungal disease. Avoid watering near the trunk or in compacted soils. Younger or newly planted oaks may need more frequent irrigation during their first few summers, but should be gradually weaned off. Always monitor soil moisture and adjust based on weather and soil type. Thoughtful irrigation protects the health of coast live oaks and preserves their ecological and aesthetic value in the landscape.

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