Flower Pot Drain Hole Cover: Just lay a coffee filter in the bottom of the pot covering the hole before filling the pot. The soil will stay in the pot and the water will still drain out because that is what coffee filters are designed to do; let water through. They last for a long time, too; by the time they fall apart, the potting soil is well packed and the plant has roots that hold the soil together.
Coffee Filter as Soil Saver-Place one filter over a flowerpot’s drainage hole to prevent soil from leaking out.
Plant pot too heavy? Buy a bag of foam packing peanuts (available at office supply stores). Fill the pot one-third to one-half full of peanuts, cover with landscape fabric and then add soil. This cuts the weight and saves money, since peanuts cost less than good potting soil. However, a smaller amount of soil means more frequent watering. To slow evaporation, cover the soil with wood mulch.