Seedless oranges were first developed in Southern California just before 1900. Horticulturalists there were celebrated for developing superior navel oranges with thinner rinds, sweeter juice and more rounded shape. Today, many hobby gardeners purchase seedless orange trees and grow them indoors or outdoors. With some patience, skill and care, gardeners can graft seedless orange trees onto existing trees in their orchards.
Graft a twig from a seedless orange tree onto a young tree already planted. The orange farmer's tree of choice to graft onto is the bitter orange tree.
Cut a slice off of the young bitter orange tree. Cut a slice off of the seedless orange branch. The two openings should match; they should be about the same length and width. Use strong twine to tie the seedless branch onto the young tree. Line up the openings that you sliced and press together; tie together tightly with twine.
When successful, the trunk of the tree and the leaves and the fruit it produces will be of the seedless variety.
Alternatively, purchase a young seedless orange tree.
Orange trees like warmth and do not do as well in areas with earlier frosts. Orange trees can successfully be grown and cultivated indoors.