Are pesky insects eating away at your household plants? There's no need to spray them with chemical insecticides. Instead, head to your pantry and grab self-rising flour. Sprinkle a light dusting of the flour on the plant and leave it alone. When insects attempt to eat the leaves from the plant, they'll ingest some of the flour. The natural leavening agent -- baking soda -- expands when in contact with moisture, so insects die since it expands in their stomachs.