You can dig it up an pot it if you dig a large enough root ball. Figure a root ball at least 6" deep and wide. Plant in a well drained 12" or larger container with all purpose potting soil. Keep the soil evenly moist but not soggy until you see new growth - usual about 2 months. Do not fertilize. You do not want to push foliage growth.
Next spring plant in the ground. Loquat is a TREE not a shrub or a container plant.
Elizabeth - or Your Majesty
Living and growing in Lafayette, La.
When weeding, the best way to make sure you are removing a weed and not a valuable plant is to pull on it. If it comes out of the ground easily, it is a valuable plant. ~Author Unknown