Rain Garden Near a Red Maple: Will Standing Water Harm the Tree?

Red maples (Acer rubrum) naturally grow along stream banks and tolerate periodic inundation. A rain garden that holds water for only hours or a few days after heavy rain will not harm a mature red maple. Problems arise only if water stands for weeks, which can suffocate roots. Since your design covers just a quarter of the root zone and starts 6 feet from the trunk, the tree should thrive. Ensure the rain garden drains within 24–48 hours for best results.