Create a Rain GardenStorm water running off rooftops, sidewalks, driveways, and streets washes pollutants into nearby streams. A rain garden can change all that. Planted in a shallow depression with plants such as ferns, cardinal flower, swamp milkweed, turtlehead and others that don't mind occasional "wet feet," a lush and luxuriant rain garden captures runoff from impervious areas and allows it to seep slowly into the ground.