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How to Care for Citrus Trees Indoors in Colder Climates
Experts say potted citrus need bright light, careful watering and winter protection from dry air, pests and pets to stay productive indoors.
In New York, Citrus trees in pots must move indoors for winter, unlike in California where they grow year-round. Gardening columnist Jessica Damiano notes that subtropical varieties like Meyer lemon and Ponkan mandarin can handle freezing temperatures with proper indoor care.
Citrus trees thrive in south- or southwest-facing windows, or with full-spectrum grow lights for 10 to 12 hours daily. Damiano advises maintaining humidity around 50% while avoiding cold drafts, radiators, and forced-air heating vents to prevent leaf stress and drop.
Good drainage is vital for healthy roots, especially during winter when water needs decrease. Damiano suggests using well-draining potting mix and allowing the top inch or two of soil to dry completely before watering again.
Check foliage occasionally for spider mites, scale, and aphids, treating infestations with insecticidal soap or neem oil. Because Citrus trees can be toxic to animals, Damiano recommends using a 4-by-3-foot mesh bag to keep leaves safely out of pets' reach.
Next year, around Memorial Day, move trees outdoors to a shady spot before gradually transitioning them to a sunny location over one week. This seasonal shift allows plants to resume growth as temperatures warm and natural light increases.