Select a large pot or planter with at least six 3/4-inch drainage holes in the bottom. Choose a 20- to 25-gallon planter for two dwarf citrus trees or a 30- to 35-gallon planter for three dwarf citrus trees.
Cut a wire mesh screen to fit inside the bottom of the pot or planter. Top the screen with 2 to 3 inches of coarse landscaping gravel to hold it in place and reduce the amount of growing medium that washes out each time you irrigate the dwarf citrus trees.
Combine five parts potting soil, four parts peat moss, three parts well-rotted compost, two parts coarse bark pieces and one part perlite to create a fertile, well-draining growing medium for your dwarf citrus trees. Pour the homemade growing medium into the prepared pot or planter.
Plant the dwarf citrus tree saplings spaced equal distance apart in the pot or planter. Set the trees at the same depth that they grew in their nursery containers. Position the trees where they receive eight hours of direct sunlight each day.
Water the dwarf citrus trees immediately after planting to moisten their roots and the growing medium. Apply supplemental irrigation until water runs from the drainage holes in the bottom of the pot or planter. Continue to water as often as necessary to keep the soil evenly moist.
Fertilize the trees with an application of a specially formulated citrus fertilizer in early spring. Continue to fertilize the tree with a half-strength solution every three to four weeks until the end of summer.
Prune dwarf citrus trees as needed to remove browned foliage and diseased, damaged or dead branches. Remove crossed or rubbing branches to increase the airflow to the canopies.