Scientific Name
Rosmarinus officinalis
General Information
Rosemary is a sun-loving, low-water, evergreen shrub that blooms in winter and spring. There are many cultivars, from low-growing up to 6 feet tall. It is easy to grow, takes heat, and it’s deer proof.
When to Plant
Best planted in spring through early summer, but in Marin’s temperate climate it can be planted anytime.
Planting
Transplant starts or propagate by cutting. Requires full sun.
Soil Requirements
Grow in light, loamy, well-drained soil.
Water Requirements
Rosemary is exceptionally drought tolerant. Allow soil to dry out in between watering. Over watered rosemary develops brown leaf tips, a likely sign of root rot.
Fertilizing
No fertilizer required.
Pollination
Pollinated by bees and other beneficial insects.
Harvesting
Harvest regularly and pinch back the stems to below bloom. Flowers are edible too.
Storage
Rosemary sprigs can be dried by hanging them upside down in a cool, dark place. This keeps the volatile oils in the leaves. Once dry, strip leaves from stems and store them in jars until next season’s harvest.
Good Varieties for Marin
Many cultivars are available with varying scents. ‘Tuscan Blue’ and ‘Shady Acres’ are known for flavor. For cooking, avoid varieties like ‘Arp’ that are high in camphor oil, unpleasant to taste.
Helpful Tips
Avoid over watering. Pea gravel is an effective mulch. Should thrips or spider mites attack, spray plants with water once a week until pest is eliminated. If rosemary plant suddenly wilts, replace the plant, monitor watering, improve soil drainage, and increase air flow circulation with regular pruning.