Reviving Browning Rosemary Bushes: Causes and Solutions

Why Rosemary Turns Brown and How to Fix It

A gardener has three large, six-year-old rosemary bushes in different yard areas showing patchy brown, brittle growth despite green, blooming sections. No pests are visible.

Diagnosis and Remedies

After six years in the same spots, the soil may be depleted of the nutrients rosemary prefers. The expert recommends:

• Pruning: Cut back one-third of the new growth on each branch to stimulate fresh, healthy shoots.
• Feeding: Apply liquid fish fertilizer or seaweed extract (available at Home Depot/Lowe's). Avoid chemical fertilizers, which are too fast-acting for herbs.
• Watering: Let rainfall handle irrigation; rosemary dislikes soggy roots.
• Cleanup: Remove all old, brown growth to improve air circulation and reduce disease risk.

Long-Term Care

Regular pruning and organic feeding will keep mature rosemary productive for years. If soil exhaustion is severe, consider top-dressing with compost or relocating younger plants.