Field guide
How to grow rosemary: planting, care, and harvest guide
Rosemary typically reaches first harvest in 90–150 days. This guide covers when to plant by USDA zone, common pests, harvest cues, and companion plants where relevant.
Open plannerWhen to plant rosemary by USDA zone group
- USDA Zones 5–6 — May
- USDA Zones 7–8 — April to May
- USDA Zones 9–10 — February to April
- USDA Zones 11–13 — January to March
Companion plants
Good companions: Tomato (Slicing), Pepper (Sweet/Bell), Cabbage
Harvest
When to pick
- Stems have enough new growth to harvest without stripping the plant
- Aromatic oils are strongest before full flowering
How: Cut just above a leaf node in the cool morning and leave most of the plant growing.
Storage: Use fresh, air-dry small bundles, or freeze chopped leaves depending on the herb.
Common pests and problems
Aphids and spider mites
Signs: Fine stippling, webbing, or clustered soft-bodied insects
Control: Rinse foliage, improve airflow, and avoid overfertilizing tender growth.
About this field guide
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