How To Care For Smooth Hydrangeas. The smooth and panicle hydrangeas should be pruned before the flower buds are formed usually in late winter. They are generally hardy from USDA growing zones 5 to 9.
Oakleaf hydrangeas will happily thrive with just two applications of fertilizer in April and June. The smooth and panicle hydrangeas should be pruned before the flower buds are formed usually in late winter. If you need to rejuvenate a wild hydrangea plant prune the shrub to 6 inches 15 cm in springtime.
Hydrangea Annabelle favours very loose nutrient-rich soil.
Give the plant a hard annual pruning in early spring. Other types of hydrangeas will require regular feeding through spring and early summer. Deeply water 3 times a week to encourage root growth. Signs of nutrient deficiency include poor growth and small pale leaves.