After my bananas flower, I leave that tree up as long as I can. Basically until it threatens to fall over on it's own. Since they can be heavy I try not to let them fall or they will crush adjacent plants. Then I cut them in half only cart the top
Off to the compost and leave the stump. Leaving the old tree up helps supply energy to new pups. And only cutting it by half does the same. The old stump will eventually turn to mush on its own
