Rosemary (Rosmarinus officinalis) is a Mediterranean herb adapted to mild winters with cool but not freezing temperatures. In its native habitat, it thrives in well-drained soil and full sun, tolerating brief cold spells but suffering in prolonged frost. When overwintering indoors, the goal is to replicate these conditions as closely as possible to prevent stress, which can lead to leaf drop or root rot.
Before bringing rosemary indoors, acclimate it gradually to lower light levels over 1–2 weeks to avoid shock. Inspect the plant for pests like spider mites or aphids, and treat infestations with insecticidal soap. Trim any dead or overly woody stems to encourage compact growth. If potted, ensure the container has drainage holes; if transplanting from the ground, use a lightweight potting mix with perlite or sand for aeration.
Rosemary requires specific conditions to survive indoors during winter:
Reduce watering frequency in winter, allowing the top inch of soil to dry out between waterings. Overwatering is a common cause of root rot in dormant rosemary. Avoid fertilizing during winter, as the plant’s growth slows. Resume light feeding in early spring with a diluted, balanced fertilizer.
Indoor rosemary may face several challenges:
Light pruning in late winter encourages bushier growth. Remove only 1/3 of the plant’s height to avoid stress. Regularly pinch back tips to promote branching, but avoid heavy pruning until active growth resumes in spring.
As temperatures rise above 50°F (10°C), reintroduce rosemary to outdoor conditions gradually. Start by placing it in a shaded, sheltered spot for a few hours daily, increasing exposure over 7–10 days. This prevents sun scorch and allows the plant to readjust to wind and temperature fluctuations.
