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Why Isn't My Rose of Sharon Blooming? Troubleshooting a 4-Year-Old Shrub

A Rose of Sharon planted 4 years ago in full sun, weeded, was only 2.5 feet tall with minimal blooms (none last year). It was supposed to have three flower colors.

Common Causes

Shade: Even partial shade reduces flowering.
Rot: Wet summers or overhead watering rots buds.
Drought: Dry summers damage buds.
Excess fertilizer: Too much nitrogen stops flowering.

Resource

This shrub is finicky. A detailed guide: Rose of Sharon Care

Roses: Unknown Bush Similar to Rose of Sharon – Genetic Variation; Climbing Rose Stopped Blooming After Bayer 3-in-1 Application; Rose of Sharon Winter Care: Not a True Rose, But Still Needs Protection; Transplanting Mature Rose of Sharon (Hibiscus syriacus); Rose of Sharon Buds Shriveling: Possible Spider Mites, Fungus, or Watering Issues; Planting Rose of Sharon Near Shallow Buried Utility Line; When to Prune Rose of Sharon: Fall vs. Late Winter; Transplanting a Mature Rose of Sharon: Timing and Technique; Diagnosing Partial Leaf-Out in Mature Rose of Sharon Shrubs; Rose of Sharon: Hardy, Hummingbird-Friendly Shrub

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