By Islam El-Sakka
Citrus trees can thrive indoors during winter with proper care, even in colder climates where sustained freezing temperatures require them to be moved inside.
Light Requirements
Use a well-draining potting mix formulated for citrus trees. Place the trees in the sunniest spot in the house, ideally a south- or southwest-facing window. If natural light is insufficient, supplement with a full-spectrum grow light for 10 to 12 hours a day.
Protecting Pets
Citrus trees can be toxic to cats and dogs. Keep trees safely out of reach; a mesh bag with a drawstring tie allows light while preventing pets from accessing the leaves.
Watering and Fertilizing
Keep trees away from cold drafts, radiators, and forced-air heating vents. A cooler room with humidity around 50% is ideal. Water only until the soil is slightly moist, allowing the top inch or two to dry completely before watering again. Increase watering when new growth appears in spring. Fertilize weekly from spring through September, but withhold fertilizer entirely during winter.
Pest Management
Check foliage regularly for pests such as spider mites, scale, and aphids, paying particular attention to the undersides of leaves. Treat any infestations with insecticidal soap or neem oil following label directions.
Transitioning Outdoors
Around Memorial Day, move the trees outdoors to a shady spot and gradually transition them to a sunny location over the course of a week.
