Longans are large trees that are prized for their lychee-like fruit. Like lychee trees, longan trees must be grown in subtropical regions--near-freezing temperatures will quickly kill them. When longan seedlings are planted in the right climate, however, they are fairly easy to grow. If they are kept well-watered and in full sun, they will soon climb to 40 feet tall and produce an ample crop of fruit with minimal maintenance.
Dig a hole three times as wide and three times as deep as the container in which your longan seedling is growing.
Mix 1/2 of the excavated soil with an equal amount of soil mixture that is roughly 3 parts sand and 1 part aged organic compost.
Place your longan seedling in the soil so the root ball is roughly 1 inch above the surrounding soil. You will have to put some of your soil mixture in the bottom of your hole to accomplish this.
Backfill the hole with your soil mixture.
Tamp the soil down with your feet or hands to remove air pockets.
Water the soil thoroughly, but not so much that puddles form. Keep the soil moist at all times, especially while your longan tree is establishing itself. Longan trees cannot tolerate drought.
Tie the seedling to a stake driven into the ground next to the trunk. Your sapling will need support, especially if you live in a windy area.