Ripen green tomatoes in the greenhouse by hanging bananas up among the plants. They release a ripening gas called ethylene, which will encourage the tomatoes to turn red. After a few days, your tomatoes and bananas should be ready to eat.
Feed roses with the added potassium and save money on rose Chop up banana skins and place on the soil around roses, fleshy side down. The skins will rot down and add plenty of nutrients for the plant roots.