Firstly you need a good sucker banana tree that is verified disease free.
Once it grows into a tree (palm) it will eventually bear fruit.
But its the suckers underneath that produce the new trees.
After the tree has bared fruit you need to cut it down and only keep the sucker trees at the base of the parent tree that have broad leaves.
Remove all thin leaved suckers as these are less productive.
Also if you are on a hill keep the suckers at the top of the hill when possible.
Fertilize and the beginning and end of every season!
I hope this helps solve your question.
From Marty Ware: Australian Agricultural Horticulturist!
As Marty1 said; The first thing is a good healthy banana plant. There are numerous varieties, some tress can grow to mammoth heights.
It's very important that the mother plant gets plenty of sunshine and lots of water.
I have a banana plantation and I fertilize with natural compost as banana plants have rather shallow roots.
Once the tree as produced the fruit you need to cut all the leaves from the tree. Cut the tree about a meter from the ground leaving a stump. This will continue to nurture the baby plant that grows naturally from the mother plant.
Remove all other baby plants; if you don't you will have weak trees. You can replant the other baby plants, but make sure you give them plenty of space. About a meter free of other plants.
Banana trees need to be kept tidy; as they grow remove any dead leaves from the tree and keep the ground surrounding the base moist and weed free.
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