In a 15-gallon pot, your tree will grow ~ 7 feet tall, and in a 1- gallon pot, it will grow ~ 4 feet tall. Prune your tree twice yearly to keep it between 3-7 feet, as desired.
For aesthetic purposes, prune the top and bottom branches. Keep the upper and middle branches longer.
Prune flowers and fruit the first year, as your tree needs 30 leaves to produce one quality fruit. Growing flowers take energy away from leaf growth. If you want to keep flowers, expect slower growth.
Pruning stimulates new growth. Prune with pruning shears or scissors. Cut 0.5 cm above a leaf/thorn at a 45 degree angle. Clean your pruning shears with rubbing alcohol prior to use.