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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.
Most Cold Hardy. Kumquats. Satsuma. Sweet Oranges. Navel Oranges. Mandarin. Grapefruit. Tangerines. Tangelo. Lemons. Limes. Tender. The Facts on Cold Hardy Citrus. It was 23 degrees in Metairie the first week of January 2014. All 1 year old trees survived OK. The limes and lemons lost some leaves on the top. It was 22 degrees in Metairie overnight for 3 nights a few years ago. This is very cold for us. My 10 year od Lime tree lost about 10 percent of its leaves on the north side of the tree and all its blossoms. My 3 year old Meyers lost all it leaves but came back strong in the Spring. No damage to any other citrus trees.