Vivek.M wrote:

Hmm..well he could dry the Banana-stem shavings to get rid of excess
moisture ( on the roof, if it's possible; that will shrink them a bit
and speed up decomposition )

Erm - heaving bags of of banana-trunk bits up on to the roof ? This
might work with a flat roof where they could be out of sight, but not
on a pitched, slated one. Even if bags could be fixed so as not to
slide off (no easy feat), the visual effect would not go down at all
well with neighbours. Nor me for that matter!