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Tree hydrangea are created by pruning paniculata types into a tree-like shape. According to hydrangeashydrangeas.com, paniculata is the only type of hydrangea that conforms to this pruning with branch removal close to its base at the top of the rootball. Once established, hydrangeas require little attention. Known for their large showy blooms, winter hardiness and ease of maintenance with minimal watering, the hydrangea tree is a great choice for your garden.
Transplanting
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The optimum time to transplant your hydrangea is while it is still dormant. After transplanting, water thoroughly. No more water is required until new growth appears the following spring. The first and second summer after transplanting, hydrangeas must be kept watered during dry spells to ensure root development. If the leaves appear limp and the soil seems moist enough, mist the leaves each day with the lightest setting on your sprinkler until they improve.
Established Plant Maintenance
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Most Hydrangea trees and shrubs can go weeks without extra watering except in arid climates or in drought. Watering from a hose is most effective done slowly and deeply, not frequently, to avoid water run off. Frequent, light watering causes the roots to remain shallow and inadequate for nourishment. Over-watering is just as destructive as permitting the plants to dry out. Over-watering promotes rot and disease. Test for moisture by inserting a finger into the soil at the plant's base. Allow soil to dry several inches deep before watering.
Dry Climates
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Hydrangeas thrive best in moist soil. In dry, arid climates, use water and energy efficient soaker hoses or drip irrigation. Water established plants for a short amount of time at least twice a week during extended sun, wind or drought to keep soil moist, not saturated. Maintain moisture even during the winter months. Mulches help to prevent water loss in all climates but especially in arid conditions.
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