Grafted Key Lime (Citrus Aurantiifolia 'Key Lime')Key Lime a hybrid citrus native to tropical Southeast Asia. These make great container plants for your patio and can be brought inside for winter as an attractive houseplant. All of our 3 gallon and larger citrus plants are grafted, so they usually produce fruit during their first year. Difficulty Rating N A Hardiness Rating (no protection) 10 Winterization for zone 5 6 7 Not hardy must bring indoors