Troubleshooting
Prostrate Rosemary problems — and how to fix them
Prostrate Rosemary (Salvia rosmarinus 'Prostratus') is generally forgiving once you match its basics, but a few issues come up again and again. Here is what each one looks like, why it happens, and the fix.
Winter root rot
Cold, wet soil rots the roots of this less-hardy form; ensure very sharp drainage and reduce winter watering, or overwinter pots under cover.
Powdery mildew
The dense trailing mat traps still, damp air; thin growth for airflow, avoid overhead watering, and don't crowd plants.
Woody, bare centre
With age the middle goes leggy and sparse; trim lightly after flowering, but avoid cutting back into old leafless wood, which often won't reshoot.
Cold damage
More frost-tender than upright rosemary; foliage browns and dies in hard freezes, so site it in a sheltered, sunny spot or grow it in a movable container.
Prevent prostrate rosemary problems before they start
Most prostrate rosemary issues are care-mismatch, not bad luck. Dial in the basics:
- Common rosemary problems — the species this cultivar belongs to
- What's wrong with my plant? — the diagnosis apps compared
- Prostrate Rosemary watering schedule
- Prostrate Rosemary light requirements
- Best soil mix for prostrate rosemary
- Prostrate Rosemary temperature & humidity
- Full prostrate rosemary care guide
Looking for prostrate rosemary in general rather than its problems? Read the full prostrate rosemary care guide — light, water, soil and feeding.
Prostrate Rosemary problems — FAQ
Why is my prostrate rosemary winter root rot?
Cold, wet soil rots the roots of this less-hardy form; ensure very sharp drainage and reduce winter watering, or overwinter pots under cover.
Why is my prostrate rosemary powdery mildew?
The dense trailing mat traps still, damp air; thin growth for airflow, avoid overhead watering, and don't crowd plants.
Why is my prostrate rosemary woody, bare centre?
With age the middle goes leggy and sparse; trim lightly after flowering, but avoid cutting back into old leafless wood, which often won't reshoot.
Why is my prostrate rosemary cold damage?
More frost-tender than upright rosemary; foliage browns and dies in hard freezes, so site it in a sheltered, sunny spot or grow it in a movable container.