Transplant the miniature azalea into a pot no larger than the diameter of the plant's growth. For example, use a decorative 8-inch pot for a plant that is 8 inches across. Use a quick-draining potting mix, such as one with vermiculite, or make one with one part peat to three parts potting soil.
Add 1/2 inch of peat on top of the growing medium around the plant. This nourishes the plant, insulates the roots from excessive heat, and reduces evaporation.
Water the plant lightly immediately after transplanting. Keep the soil moist, but not saturated.
Keep the miniature azalea indoors in a cool room or in a protected environment such as a porch.
Prune the azalea after all blooms are spent. Clear the debris from the pruning to avoid attracting pests.
Prune any long branches to make the azalea thick and lush. Give the azalea a rounded shape so the mature plant will resemble a small tree or shrub.