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Generally, choose a location that receives morning sun and afternoon shade. In warmer climates, like the southern US, hydrangeas should not be planted in full sun – dappled, partial sun is perfect for them. In cooler climates, like the Northeast, hydrangeas can tolerate full sun. Certain varieties will not flower if they are planted in deep shade.
Hydrangeas also need regular watering, especially during dry periods. You want to keep the soil consistently moist, but not waterlogged. If you live in the hotter end of their range, you should set up irrigation to ensure they receive the proper amount of water each day during the height of summer. Use drip irrigation to reduce risk of fungal disease.
Pruning Hydrangeas
When to prune hydrangeas depends upon the variety. Hydrangeas that bloom on old wood should be pruned immediately after their blooms have faded. Hydrangeas that bloom on new wood should be pruned in the spring.
Applying a balanced fertilizer in the spring will promote healthy growth and vibrant flowers. You should wait until your area’s last frost date has passed before fertilizing. Fertilize again in late June or early July.