How to Lose Your Bermuda Grass
Bermuda grass (Cynodon dactylon) is a popular choice for lawns in the hotter regions of the West for very good reasons. It loves heat, it’s remarkably resistant to wear and tear, and, as turf goes, it’s relatively drought tolerant.
But its admirable vigor also makes this turf a challenge to remove if you decide to replace it with something else. Bermuda grass (Cynodon dactylon) spreads by underground stems (rhizomes) and aboveground runners (stolons). It seeds pretty aggressively too.
Because it’s so tough and persistent, most professionals and homeowners use an herbicide (generally glyphosate) to kill it.
They spray, strip off the dying sod, irrigate to generate growth of any surviving rhizomes, and then repeat the process at least once (one treatment rarely kills a Bermuda lawn).
But if you don’t want to use glyphosate―and the herbicide is not as benign as originally believed―you do have other options. Three professionals weigh in.
1. Owen Dell, landscape contractor and author of Sustainable Landscaping for Dummies, Santa Barbara
Dell swears by this method to get rid of all kinds of lawn, including Bermuda. He strips off the grass, covers the soil beneath it with three layers of cardboard, tops the cardboard with 4 or 5 inches of mulch, then lets the whole thing sit for six months.
But he warns: Once you’ve gotten rid of the Bermuda, don’t assume your job is over. “Bermuda seeds are in the air,” he says. “It may be one year or it may be five, but they’ll be back.” So be vigilant.
2. Cheryl Wilen, area advisor for Los Angeles, Orange, and San Diego Counties under the UC Statewide Integrated Pest Management Program
Use a fabric barrier
Too impatient to wait six months? Put down heavy landscaping fabric after you scrape away the grass. Next, cut holes in the fabric―the smaller the better―just where you want to plant.
This method only works for permanent plantings such as shrub and perennial borders, not for annual and vegetable beds that get changed out frequently, she says.
Cover the cloth with mulch to keep it from degrading in the sun. If possible, irrigate with drip so that only the planted areas get moisture. You’ll have to monitor the cut-out areas for Bermuda intrusion, but the rest of your yard should stay weed-free. (The roots in the covered portions of soil simply stop growing.)
Harness the sun
Covering Bermuda with clear plastic and letting the sun’s rays bake it to death can be very effective in the summer if you live inland, says Wilen. But it doesn’t work if you live on the coast where summer weather is often cool; and it doesn’t work in shaded areas.
For a different method: First, stop watering and let the grass turn brown. Then mow it as close to the ground as possible and rake up the clippings. Irrigate once, then cover the turf with heavy, clear plastic and leave it in place for four to six weeks.
3. Karen Contreras of Urban Plantations, specializing in ornamental edible gardens, San Diego
Contreras removes Bermuda grass after the weather cools and some rain has fallen, because the grass is more pliable then. She digs down 4 to 6 inches and turns the soil over. Then, because she wants to conserve as much topsoil as possible, she separates the clumps and pulls out the roots by hand. If you want to save even more soil, says Contreras, throw sod and roots on a tarp afterward to let them dry out for a few days, then shake off the excess soil.