How to Make a Hydrangea Blossom
- 1). Protect hydrangeas from late cold snaps that may injure the buds after they begin to swell, as well as from severe winter weather. Most hydrangeas form buds the previous year and remain dormant over winter. When these buds are injured by cold weather, the shrub won't bloom. If you continue to have problems with winter injury, plant newer varieties that produce new buds during the current season, such as Michael Ramsey, Endless Summer, Deacatur Blue and Lilacina.
- 2). Prune hydrangeas as soon as the flowers fade. The buds begin to form soon after flowering, and if you prune too late, you will prune off next year's buds.
- 3). Provide hydrangeas with plenty of sunlight. While they benefit from some afternoon shade, too much shade reduces blooms. Move hydrangeas to a sunnier location if nearby trees and shrubs prevent sunlight from reaching them. When planting new hydrangeas, consider the growth potential of nearby plants.
- 4). Fertilize annually in spring with a low-nitrogen fertilizer, such as 5-10-10. Too much nitrogen encourages lush foliage at the expense of flower production.