But does the same tree ever fruit again? When there is no shortage of trees, a fruit tree that doesn't fruit isn't much use. Maybe you'd like to keep the trees around if they're decorating your yard. These are just propagating in the woods. Carrying a ladder across the stream, through the hau bushes, and up over the rock terracing would not be easy! Cutting down the old ones makes room for the new ones that will eventually fruit. My mom likes to hack the trunk into pieces to aide the composting cycle. I guess heavy is relative. You might want to help your mom catch the trunks, it's a two-person job. Though if there aren't any bananas on them, there's no need to get in their way. Just let 'em fall!