I have just planted a Metasequoia glyptostroboides in a fairly water-logged field. Unfortunately, after heavy rains a puddle of water tends to gather around it's base to a depth of an inch, and it can take up a day or two to drain away. I'm worried this might cause the base of the tree to rot. Or maybe the roots. Should I replant my tree on slightly higher ground? How do willows manage to sit in so much water without their roots rotting? Do their roots differ to trees that prefer well-drained soil?