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Give these folks a look... I bought my Finger Lime mother plant from them:https://www.fourwindsgrowers.comKevin Jones
I keep mine in a 15 gallon pot and it produces regularly. I don't have any plans to put it in the ground because the thorns and branches can get so gnarly, this way it is much more manageable. Pruning a large finger lime tree, or just trying to harvest the fruit, is not pleasant.