Bananas come from the world's largest herb, commonly referred to as a banana tree. Most species of banana trees thrive in warmer climates, although there a few smaller cold-hardy varieties that can make good house plants.
Bananas are produced on the tree from a female flower that develops without being pollinated. The banana fruit grow in a cluster sometimes referred to as a "hand." They range in size from 2.5 to 9 inches long and are pink, yellow, green and/or red. Not all bananas are suitable for human consumption. Some taste bad, while others contain seeds too big to consume.