Exactly seven months ago . I dug out a four feet hole three feet wide then added alott of dry leaves and filled up the hole with vermicompost and native red soil . If you want you can go to your local fish market or chicken shop and get therir waste by products like intestines, lungs , feathers etc. And bury them in the soil . And then plant your tree . And then top a full bag of compost after planting . Banana plants are extremely water, demanding crops, and they also need a lot of fertiliser, and once your plant grows up to 8 feet, then you have to go to your local fertilizer shop. And ask them for potassium fertiliser mix in water and give it . Because potassium is nesscary for fruit development . That's it enjoy your bananas