The deeper the roots, the less frequently you will need to water. Encourage a deep, drought-resistant root zone by watering deeply. If your soil is shallow, compacted or sandy you will have to irrigate more frequently. Leaves turn a lighter shade of green or turn yellow. Young shoots are wilted.
Leaves are green yet brittle.
Algae and mushrooms are growing. Under-watering Soil is dry. Older leaves turn yellow or brown and drop off. Leaves are wilted. Return to top of Watering Trees and Shrubs Tips for efficient watering Apply three - four inches of mulch under the plant canopy.