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Citrus trees do not go dormant in winter and will tolerate slightly lower light conditions during this period of slower growth. If your growing space receives at least 5-6 hours of full direct sun per day, supplementing with full spectrum bulbs or fluorescent plant lights can help trees perform well.itrus trees can be grown easily indoors! Key elements for success are good light, adequate humidity indoors in the winter, well-drained potting soil, additional nutrients, and consistent watering. Take any one of those away and problems can develop.
While frost is not likely to kill a healthy, mature lemon tree it can certainly inflict damage when temperatures drop below 29 degrees Fahrenheit for longer than 30 minutes. Winter hardy to U.S. Department of Agriculture plant hardiness zones 8b through 11, citrus varieties vary in their tolerance to the cold.