From Ground: First, water the mango tree tree generously to loosen the soil around the roots. Start digging a wide circle (about 2 feet from the trunk) around the tree with a shovel or garden spade, making sure to go deep enough to keep the main root system intact. Once you've loosened the soil all the way around, carefully work the shovel or spade beneath the root ball and lift the tree from its location.
From Pot: Water the mango tree tree thoroughly a few hours before transplanting. The goal is to make the soil moist so that the root ball comes out easily. Gently tip the pot sideways and try tapping lightly on the sides. The soil and root combination should then slide out cleanly. If the roots seem tightly wound around the root ball, try gently teasing them apart before transplanting.
From Seedling Tray: Seedlings of mango tree trees should be handled carefully to avoid damaging their tender roots. Use a transplanting tool or your fingers to gently lift the seedling from its tray by holding the leaves or the root ball, and not the stem.
