Miniature orange trees are ideal candidates for container trees in climates where orange trees will not survive harsh winters. The size of a miniature orange tree makes it ideal for carrying outdoors to absorb sunlight on warm days and then back indoors during cold periods that could kill the plant. But a miniature orange tree's indoor environment shields it from pollinating insects such as bees. In order to get your miniature orange to produce fruit, you must resort to pollinating it yourself.
Determine if your miniature orange tree is self-fruitful or self-incompatible. Some hybrid orange tree species are self-incompatible, which means that you will need two trees to pollinate and produce fruit. You can determine this by brushing the pollen from one fruit flower onto the stamen of another fruit flower on your tree with a paint brush. If the fruit tree does not produce fruit, your tree is self-incompatible.
Purchase a second orange tree, or visit a location where a second tree resides such as a nursery, arboretum or a friend's home with an orange tree that is in the pollinating stages.
Place a sterile plastic bag beneath the pollinating flowers and tap the branches gently to release the pollen into the bag.
Transfer the pollen to a paintbrush by rubbing the brush in the pollen.
Brush the pollen onto the stamens of the flowers on your own miniature fruit tree to pollinate the flowers.