Rain gardens have been growing in popularity for good reason. They beautify outdoor spaces while providing important environmental and ecological benefits.
Oh, and Wilmington is one of the best cities to build one in.
A recent article from Lawn Love, a lawn care and landscaping information site, ranked U.S. cities based on their viability for rain gardens.
Wilmington came in at number 8 in Lawn Love's rankings of the 500 largest cities in the U.S.
Lawn Love’s criteria included the amount of total rainfall in the city, the accessibility of native plants and gardening equipment, and the general public interest in rain gardens.
Here's why these backyard features are aesthetically pleasing, manage stormwater pollution and runoff, and are relatively simple and cost-effective to build.
Why Wilmington is among the best cities for rain gardens
Lawn Love ranked Wilmington as the eighth best city in the U.S. for rain gardens.
This is partially due to the abundance of rain Wilmington receives each year. According to the National Weather Service, Wilmington gets around 58 inches of rain per year. This is well above the national average of around 30 inches.
The accessibility of garden stores and nurseries to provide local plants was also a factor.
Finally, Lawn Love also weighed public interest in rain gardens.
Three Florida cities are atop the list: Miami, Homestead and Miami Beach. Wilmington is the only North Carolina city in the top 10 with Asheville next from the Tar Heel State at 39th.
If you start to look for them, you may start to notice the large amount of rain gardens around Wilmington.
The city adopted the Bradley and Hewletts Creek Watershed Restoration Plan in 2012 in an effort to improve water quality in both creeks. The plan involves the Heal Our Waterways program, which assists residents in projects to treat polluted runoff.
This includes installing rain barrels, planting trees, rerouting downspouts, and, of course, building rain gardens.
The city has helped to fund and install over 50 rain gardens in the Bradley and Hewletts Creek watersheds.
The University of North Carolina Wilmington, the largest landowner in the Bradley Creek watershed, has rain gardens throughout their campus. According to their website, the network of rain gardens can treat 400,000 gallons of polluted stormwater every time it rains.
What are rain gardens?
The Environmental Protection Agency defines a rain garden as: “a depressed area in the landscape that collects rainwater from a roof, driveway or street and allows it to soak into the ground.”
These gardens are planted with native shrubs, grasses and flowers.
Generally, rain gardens are dug anywhere between 6-12 inches into the ground at their deepest point. The depth depends on the soil type and how quickly it drains water.
Rain gardens also tend to be built at the base of a slight slope so they can collect runoff at a steady pace.
Beyond enhancing the look of a yard, the purpose of a rain garden is to collect polluted runoff from gutters, streets, and sidewalks. When it rains, the water will temporarily pool in the rain garden before slowly soaking into the soil.
This process helps filter out some of the pollutants from the runoff, such as metals and excess nutrients, before they reach lakes, rivers, streams or bays.
They’re designed to drain within 24-48 hours, meaning they shouldn’t attract mosquitoes.
Because of the large number of impervious surfaces in cities, rain gardens are ideal for urban areas. They help reduce the rate and volume of runoff, which can also prevent overflow in heavy storms.
What are the environmental and ecological benefits of rain gardens?
Rain gardens are most praised for their ability to reduce the volume of polluted runoff.
According to the Groundwater Foundation, an organization dedicated to clean and sustainable groundwater, "rain gardens are effective in removing up to 90% of nutrients and chemicals and up to 80% of sediments from the rainwater runoff. Compared to a conventional lawn, rain gardens allow for 30% more water to soak into the ground."
But the benefits don’t stop there.
Rain gardens also provide food and shelter for pollinators, birds, and other wildlife. This is especially important in urban and developed areas, where suitable habitats for these species may be scarce.
How you can build your own rain garden
The city of Wilmington, in partnership with New Hanover County, offers full funding and installation of rain gardens through their Heal Our Waterways program. The program is available to individual properties within the Bradley Creek and Hewlett watersheds that meet the city’s requirements.
An application form is available on the city of Wilmington website.
The city also offers cost-share rebates up to $10,000 for large-scale projects from developments, businesses, and HOAs. Rebates for large-scale projects are increasing as well, said Anna Reh-Gingerich, the Watershed Coordinator for the program.
If your property isn't located within the Bradley Creek and Hewlett watersheds, a rain garden is still relatively simple to build on your own. Lawn Love also has comprehensive guide to planning and building a rain garden in your backyard.
Charlie Kingree is a reporting intern for the StarNews. You can reach him at [email protected].