I have a decorative pot with a drip line in it that is positioned over clay soil. I kept finding the pot full of water and after digging about 18 inches down I am still in clay. I am not sure what to do about aiding the drainage. The location is flanked on 3 sides by concrete stairs, a sidewalk and our front porch. I have been waiting for nearly 3 days for the water in the hole to drain out and while it has diminished some, I think it may only be by way of evaporation. Does anyone have any ideas on how to deal with this? Would gypsum or pearlite help?