From David Beaulieu,
Your Guide to Landscaping.
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Many readers communicate about their shrub problems, etc. through my Web site. Some of the more common shrub problems reported concern flower buds (be it the paucity of flower buds on shrubs or the failure of flower buds to open) and the presence of yellow leaves in summer. The following questions about shrub problems, etc. (and the corresponding answers) are adapted from such sources as forum posts, email exchanges, and comments on my landscaping blog:

Q.--
Why Isn't My Wisteria Blooming?

Q.--
Why Won't My Lilacs Bloom?

Q.--
The Flower Buds on My Old Lilacs Are Too High Up to Enjoy. How Should I Trim Overgrown Lilacs?

Q.--
Why Are My Rose of Sharon Flower Buds Not Opening?

Q.--
Why Are My Azaleas Not Blooming?

Q.--
Why Are the Leaves on My Rose of Sharon Turning Yellow?

Q.--
Why Have the Leaves on My Young Bradford Pear Trees Wilted?

Q.--
What Is Root Pruning and How Can It Help My Old Shrubs?

Q.--
How Can I Tell a Male Holly Apart From a Female Holly?