I
F YOU’RE SEARCHING OUT INFORMATION ON NATIVE PLANTS RIGHT NOW, it might be because you’re interested in pollinators like butterflies and bees, especially monarchs. Fifteen years or so ago, however, local experts began doing native plant presentations at places like Ferndale’s Kulick Center, and the main focus was the benefits to waterways because of the ability native plants have to hold excess storm water. Less storm water pouring down drains, less pollutants riding along, means cleaner Great Lakes. Nothing much was mentioned in those presentations about bees and butterflies except as an interesting side effect. Neither did they mention flooded basements, those still being a rarity. If only those experts had waited a couple of years! Soon after this push to go native, basements in our local communities began to flood. And flood, then flood some more. Some homeowners now have flooded basements a couple of times a year. Heavier and more frequent rainfalls are the culprit, but the means by which water gets into our homes varies as much as our soil, plants, construction materials, and methods have varied. Why do basements flood? Utilities Kingston, Ontario blames “...seepage or flow through the walls or foundation floor, from surface water
sources, or by a sanitary or storm sewer backup.” This Old House says, “Even a small storm can trigger a deluge... a house with a 1,500-squarefoot roof sheds 1,000 gallons of water for every inch of falling rain. Once the water accumulates around your foundation, it works its way inside through cracks, joints, and porous material.” A number of sites mention gutters and downspouts sending water down walls instead of away from the house. Most mention nearby concrete and slope of landscape. Most mention soil composition, and many mention what’s planted near that basement. Cleanwater.com says “Plants are the first line of defense when it comes to erosion control and stormwater management...The extensive and deep root systems of native plants slow down runoff.” Those roots hold water in the soil. Grass roots might be only two-to-four inches deep, but Ferndale’s city flower, Purple Coneflower, has roots that can penetrate to five feet, every inch of those roots able to hold water. Texas Native Plants states that those longer roots provide “flood mitigation services” and that they also filter out pollution.
I
F YOU’RE NEW TO MICHIGAN OR GARDENING you might be wondering what native plants even are. They’re just plants that were here before people like us were. There's quite a variety, and something for everyone: tall sun-lovers like
Coneflower and Black-Eyed Susan (loved by birds like gold-finches as much as butterflies); shorter ones like Canada Anemone that not only grow in shade, but bloom in it; specific host plants like Milk-weed, the only plant monarchs will lay eggs on or their caterpillars will eat. There are even some adaptees that fit in quite well, like Queen Anne’s Lace (mine is crawling with swallowtail caterpillars) or Mullein, which may not have the prettiest flower stalk in the world but you won’t mind when you see downy woodpeckers land on it for the seeds. Their long roots hold water for them, as well as for us. These plants don’t need much extra from the grower. Turf grass, on the other hand, has much shorter roots in comparison, but that’s not the only issue. Remember Michigan master gardener Jerry Baker? He promoted a formula for lawns that included things like beer and ammonia but also dish detergent, which allowed everything else to work for one reason: turf is water-repellent. Detergent breaks the surface tension and allows water to soak in. Yes, water-repellent. Turf websites, especially golf course sites, call it that, and so promote the use of chemical surfactants to keep water on grass. Some sites actually call grass “hydrophobic.” Thatch is the main reason for this, and the more you fertilize lawn the more thatch it likely has. It occurs when plants build up more decay-
More Natives = Less Flooding
Is Your Lawn Flooding Your Basement? BY REBECCA HAMMOND
