A standard banana tree can grow to be over 15 meters (49 feet) in height and will become too large for a regular pot. When purchasing a banana tree, make sure that you go for a dwarf variety of tree. These trees only grow to around 1.5 m (5 feet) to 4 m (13 feet), can be grown indoors, and will not outgrow the pot that you put them in. Look online for different varieties of dwarf banana tree corms for sale. Types of dwarf banana trees include the Dwarf Red, Dwarf Brazilian, Williams Hybrid, and Dwarf Lady Finger. The corm is the base of the banana tree and contains the tree's roots. If you don't want to plant the corm and wait for the tree to grow, you can buy a young banana tree or a banana tree sucker. This will bypass having to grow new suckers from the corm, and may make it easier to plant your tree. You may also be able to buy young banana trees or banana corms at a local nursery. Banana trees thrive in well-drained soil. When looking for the right type of soil, consider ones with a good mix of peat, perlite, and vermiculite. A cactus or palm tree soil mixture is an excellent choice for banana trees. You can purchase bags of this soil at most home and gardening stores.  Some soil is not beneficial for banana tree growth, such as standard heavy potting soil or soil that's found in your yard.  Your banana tree will do best in soil with a pH of 5.6 - 6.5.

Summary:
Choose a dwarf variety of banana tree. Purchase a corm or banana tree online or at the store. Get well-drained, mildly acidic soil for the tree.