Canadian, Former Touring Showpony, World Traveler, Parent, Exhausted.
Cover the surface of your soil in a layer of powdered cinnamon (and mix a bit into the top layer for good measure). It eliminates the excess moisture that allows the gnats to feed & grow. They'll disappear in a day or two!
Cover the surface of your soil in a layer of powdered cinnamon (and mix a bit into the top layer for good measure). It eliminates the excess moisture that allows the gnats to feed & grow. They'll disappear in a day or two!