Rain gardens are shallow, landscaped depressions planted with native plants. They are designed to collect runoff from hard surfaces such as roofs, patios, paths, and driveways. Rain gardens can be designed in many shapes and sizes to fit with your landscaping and how you use your yard. Because they drain within a day or two, they do not allow growth of mosquito larvae. Homeowners have installed over 40 rain gardens around Deer Lake.