‘Glenn’ Mango Trees can grow up to 30 feet tall. However, you can keep mango trees well under this height by pruning the main leader or main stem of the tree. This will stimulate branching. The species naturally forms a round canopy as it matures. When grown in a pot, a ‘Glenn’ Mango Tree will not grow much larger than 10 feet tall, even without pruning. The tree grows relatively fast. An individual plant can go from seed to a small fruit bearing tree in just three or four years.