Uncle Daves Pot Screens - Ideal for Pots, Planters, Bonsais and Any Plant Containers Keep Your Soil In & The Bad Bugs Out! One Size Fits All Pots & Planters! Simply place your pot screens over the containers holes and fill with soil. Allows the water to filter through while keeping the bad bugs from coming in! Mildew and fungus resistant, and provides good support and drainage.