Select a 10- to 12-inch-wide pot, with at least two to three holes in the bottom for drainage. Position the container in its permanent location before filling it with soil. Cut a piece of screen mesh to cover the bottom of the pot on the inside, to prevent the soil from escaping when the tree is watered.
Fill the pot half full with equal parts peat, perlite and sand.
Inspect the roots of the dwarf mango tree before planting and use your fingers to loosen any that are compacted. Trim off discolored roots as well as those growing in a circle.
Place the root ball into the pot and finish filling it with the growing mixture, to within 1/2 inch of the rim. Water until the soil feels evenly moist.
Spread 1 inch of organic mulch over the growing mix, keeping it at least two inches from the dwarf mango's trunk.
Water when the top inch of the growing mix dries out.
Apply organic 8-8-8 fertilizer each spring, in the amount directed on package instructions. Sprinkle the granules over the growing mix and water thoroughly after feeding.
Trim spindly branches back by half during late winter or early spring, to encourage fuller growth. Remove dead or damaged branches at this time as well. Wear protective gloves because the sap exuded by mango trees may be irritating to the skin.
Move the pot to a sunny indoor location during early fall if you live in a region that experiences winter temperatures of 40 degrees Fahrenheit or below. Continue to water when the top inch of growing mix dries out but avoid fertilizing again until spring.