Answer: Key limes are not that picky about their soil mix. It should drain well and yet hold some moisture. If you are going to plant them in containers, I would suggest a mix of equal portions of sand and compost. If they will be planted in the ground, go with the soil from the site where they will be growing. If you want you can mix some compost in a large area (10 foot indiameter) prior to digging the hole and planting the trees. But don't just amend the soil in the planting hole.
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