BTW: you could use the fibre from the Banana stem for binding stuff in
the garden. Dad composts his Banana stems after using a hacksaw to
slice them up ( longitudinally first and then latitudinally ). The
green outer layer takes ages to decompose, but the pith goes much
faster. He digs a 6'4'4' compost pit which he fills with cow-dung,
dog-poo and other green stuff. The whole thing is tarp'd all the time
except when we want to dump stuff. The weather is warmer here which
hastens the de-composition; not sure what you can do other than trying
to compost it. What about trying to make a mulch out off it?