Rose Of Sharon Failing to Bloom - Knowledgebase Question

Forestville, MD
Question by bjsaunders9
August 22, 2000
I planted 3 Rose of Sharon last year. They are growing well, no sign of anything wrong with them. Two have bloomed and continue to do so. One, the Pink, hasn't but the Buds formed and partially opened, but stopped. They did get a little larger but its been over 6 weeks and they have failed to open. The Buds do have some moisture but I am afraid they are too dry, not at the "dry" stage yet but getting there. They each get enough sun and have had ample moisture this year; however, last year, they were sort of neglected due to the drought we had. Please advise.


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Answer from NGA
August 22, 2000

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I'm not sure why the blooms would fail to open. Perhaps it's reacting to droughty conditions from last year and will overcome the problem by next season. In general terms, there are two main possibilities for why Rose of Sharon (Hibiscus syriacus) doesn't bloom. This shrub blooms during summer on the current year's growth. This means that any trimming or shaping or pruning must be done in the very early spring. Many gardeners trim this shrub back very early each spring to promote blooming. In other words, if you trim it during the growing season you will remove the flowering wood.

Another possibility is poor growing conditions. This shrub is not too particular about soil as long as it is not excessively wet or dry, but it does need sun. Full sun all day is ideal since this is a plant that prefers hot weather, but a half day of full sun will also do.
I hope this helps you figure out why your shrub hasn't bloomed!


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