Answer: Yes you could transplant the tree outdoors. Now would be a good time to do it. Be ready to give it some protection if the temperature drops to 30 degrees or below.
To prepare the soil you could add a bit of compost to the entire planting bed not just the planting hole. Then dig a hole and plant the tree at the same depth it was growing in the pot, and water it in well. Citrus does best on a slightly mounded planting bed, as this prevents water from standing around the trunk during extended rainy spells.
Good luck with your lime tree!
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