When it's time to bring your houseplants indoors, do this one thing: Sprinkle them with black pepper. Ground black pepper is a natural deterrent for insects, so any little bugs that may get a free ride into your home will run away from your peppered plants. Just mix a large amount of black pepper with white flour, and gently sprinkle it on top of the leaves and ground -- using a metal sifter makes it a mess-free project. Wait 24 hours before you bring the plants inside. All of the bugs will be long gone, and the peppery flour will naturally degrade and disappear.