For the best success growing citrus as a houseplant, place the container where the plant will receive as bright light as possible, such as in a south or southwest facing window. Citrus trees do not go dormant like many other plants, so they need sufficient light and some humidity during the winter.
Insufficient light, cool temperature and low humidity can force the houseplants to shed its leaves in fall and winter. But a few modifications to the indoor environmental conditions can help the plants to thrive through the winter season.
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