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Banana skins
Banana skins
Tip from Shoot User
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Chopped banana skins (1"-2") are great for plants. Don't take my word for it, look online and be surprised: They rot quickly. Dig in near bottom of pots or well below roots; the skins have a natural insecticide. If you've plants with shiny leaves, wipe them using the pithy part. This promotes the shine and imparts their natural insecticide which will deter aphids. :-D
Two drawbacks.= :-( Not advisable for composting When the skins are warm they give off a pheromone which bees exude when in distress. If you come between a bee & the skins, the bee will become aggressive.
DON'T use for fruit or veg. The outside of the banana skins contains a carcinogenic chemical.