They will focus on largely inedible wild bananas, which are full of hard seeds, since many of these are resistant to black sigatoka.

BBC: Bananas could split for good

Mr Mooney's rooftop is full of these white towers, where seeds are planted up along each tower's spine.

BBC: The technology that's transforming gardening

Mr Zimba frets that he cannot afford enough seeds or fertiliser to make full use of his land.

ECONOMIST: No title