Hydrangeas ( Hydrangeaspp . ) are popular shrub that are grown primarily for their jazzy flower clusters . Most hydrangeas do n’t produce flowers in their first season . However , established hydrangea not bloom can be the result of wrong pruning or fertilization , freeze down temperatures or deficiency of sunlight .
Species of Hydrangeas
The hydrangea species with which most gardeners are intimate is thebigleaf hydrangea(Hydrangea macrophylla , zones 5 to 11 ) , which produces circular clusters of flowers that may be pink or bluish depending on the pH of the grime .
The oakleaf hydrangea ( Hydrangea quercifolia , zones 5 to 8) , which start its name from its foliage that resembles that of oak tree , produce flush clusters in a pyramidal physical body .
Other species of hydrangea include the panicle hydrangea ( Hydrangea paniculata , zones 3 to 8) , which produces cone - shape clusters of fragrant lily-white flowers , and the smooth hydrangea ( Hydrangea arborescens , zones 3 to 9 ) , which has small snowy flowers arranged in flattened cluster , or corymb .
Why Don’t My Hydrangeas Bloom?
" My hydrangeas are not flower " is a ailment that home gardeners often make . Let ’s depend at some of the reasons this materialise .
Incorrect Pruning
Some hydrangeas , let in the popular bigleaf hydrangea and the oakleaf hydrangea , produce their blossom from buds that appear on the previous growing season ’s wood .
- These hydrangeas should be pruned immediately after they are finish up flowering . * * If you hold back until fall or wintertime to prune these hydrangeas , you hazard removing flower bud and may end up with few or no flower in the spring .
Other hydrangeas , such as the panicle hydrangea , grow their heyday on new wood from the current develop season . These species are substantially pruned in the fall and winter and can be prune more harshly .
Lack of Water or Sunlight
hydrangea are known for beingshade - loving plants . * * But while some wraith is important , too much of it can result in poor or incomplete flowering . * * Morning sun and good afternoon shade are ideal for many case of hydrangea , including the bigleaf hydrangea .
As a principle , the more sunlight a hydrangea works motivation , the more water it requires . deficiency of watering can have a negative core on blooming .
Excessive Fertilization
- Overfeeding hydrangea with fertilizer plenteous in atomic number 7 can result in few blooms . * * This is because atomic number 7 stimulates leaf growth rather than flowering . To boost bloom production , hydrangeas should be fertilise with formulas that moderate more phosphorus .
Cold Injury in Hydrangeas
The reason behind a hydrangea not blooming can be due to factor out of your dominance , namely temperature .
- The buds of many hydrangea species are sensitive to hoar and inhuman temperature . * * In the pillowcase of hydrangea that grow flowers on older wood , gloomy wintertime temperatures can damage bud , resulting in few bloom in the spring . Late freezes in outflow can also belt down buds and reduce blooming .
In cold climates , you’re able to protect hydrangea industrial plant and their precious buds during the winter months by circumvent the works with chicken wire and filling up the space around the plants with leaves . Choosing cultivar that are reliably winter hardy where you hold up can minimize this job .
