Native to Southeast Asia, banana tree plants (Musa acuminata or M. balbisiana) are herbaceous plants that can range in size among different cultivated varieties. Banana plants cannot tolerate frosts and thrive in consistently hot to warm temperatures, most commonly grown outdoors in tropical to subtropical regions. Some smaller or dwarf banana plant varieties can be grown easily indoors in containers in colder climates. Banana plants produce one or several trunklike shoots called "pseudostems" that grow from underground rhizomes and produce stalks that bear fruits for just a single year.
Water your banana plants once each week to apply 1 to 1 ½ inches of water when rainfall is inadequate. Water the banana trees during the spring, summer and early autumn, soaking the soil down to and around the roots.
Feed your banana plant once every 2 months with ½ lb. of 6-2-12 NPK fertilizer that contains 2 to 3 percent magnesium. Gradually increase the fertilizer amount to 5 or 6 lbs. when the banana plant is flowering and bearing fruits.
Spray your banana tree plant with a foliar spray containing copper, manganese and zinc once each year. Follow the application instructions on the label.
Apply a weed mat around the banana tree, covering a 2- to 6-foot-diameter area around the plant. Spread a 2- to 6-inch-thick layer of organic mulch over the weed mat.
Prune away all stalks that grow from the base of the tree immediately after they're finished fruiting. Cut off any dead leaves, leaves that are rubbing against the banana bunches and the ends of flowering stalks that aren't producing fruit hanging below the bottommost banana bunches.