japanese maple planted in pot has water sitting on top now
I planted an expensive Japanese maple in a cement container. I bought the plant from Wayside Gardens about 5 years ago. I surrounded the pot every winter with insulation. It has done well until now. Water from several recent rains sits on the top soil, about three inches of water. it does not go down. I lifted the pot an inch or so to check the center hole for draining. A large tree root is in the center hole. what can I do? some of the leaves are discoloring now.