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My last place was overrun with bermuda. What a nightmare.
You don't kill bermuda. Seriously. Perhaps if you were willing to saturate your soil to a depth of 4 or 5 feet with something noxious that would kill every last thing in the soil, and repeat for several years, you might get it all.
Don't count on it, though.
Every last fragment of root or stem anywhere in the soil can sprout and begin to grow again. The more water, the faster and more prolific it will be. Even if you think you've killed it, when you start growing something, and watering, it will reappear.
Frankly, I'm surprised that it isn't growing in your flowerbeds and underneath your roses. It did in mine. Since my roses were growing in the bermuda lawn, I gave up trying to keep it clear. I pulled it out of my flower beds DAILY to try to keep the flowers a step ahead.
One bed, along the front of the house, was already overrun when I moved in. I tried to eradicate the bermuda for a year, and then called professional gardeners in. They dug as deep as they could, and finally told me it was hopeless. The bermuda roots when too far under the concrete slab foundation of the house for them to get them all.
In the beginning, I tried laying down a weed barrier, and planting on top of that. What a joke. It takes bermuda less than a season to destroy all the weed barriers I tried. Here is what I finally did:
I built raised beds, 3 feet high. 3 feet high, because the roots of garden plants would never reach below the soil surface. I put down 4 x 8 marine grade plastic plywood on the soil surface. No cracks, no rotting. I built the bed a foot in on all sides, so that the bermuda could not creep in at the edges. Then I filled with compost and topsoil delivered from a local landscaping company. All that was left to do was keep the bermuda at the edges of the plywood trimmed.
When I moved, my first priority when looking at prospective houses? No bermuda, not only on the property, but anywhere in the neighborhood.
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