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I have mine in the ground and has been for about 7 years. It still is only about 4 feet tall but has been fruiting the last two years. I keep it more as an oddity and don't protect it in my zone of 9b and winters that have affected my more sensitive trees like mangos haven't bothered it. I think it prefers more shade than I am giving it though.
The next named Key/Fingers crosses:Pinky Finger LimeIndex Finger LimeRing Finger LimeDigit Finger LimeBirdy Finger LimeLittle Finger LimePhalanges Finger LimeKevin Jones