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Hardiness zone: 6a
Peg from Cecil, OH
Unfortunately, as long as you have parent plants, you're always going to have runners. Herbicides are not effective because the treatments will only last until the parent plants send out new shoots. If you want to get rid of the shoots for good, you're going to have to dig up both of the mother plants and replace them with something less invasive. Even after that, you can expect to spend somewhere in the neighborhood of 5 to 6 years pulling up any new shoots that emerge.
Eventually the plant will give up, but it's going to take an awful lot of persistence and patience on your part. Even if you don't want to get rid of both vines, by getting rid of just one you'll theoretically be eliminating at least half your problem.
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How does one get rid of a 30 yr. old trumpet vine gone rampant?
Use a woody bark herbicide, poison ivy killer, or extra strong Roundup. Spray on mature leaves. Probably will more than one or two applications. Leave at least 2 weeks between applications. Most likely, many applications will be needed as new sprouts may pop up from roots that are twining under the ground. The roots are probably nearly as long and thick in diameter as the vine is. It will take diligence to eradicate all signs of the vine.
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How can I get rid of trumpet vine? It is taking over everything.
Hardiness Zone: 7b
Ann from Smyrna, GA
You can cut the stems back to about 2 feet. Put some concentrated Round-up in a Ziploc freezer bag and put the cut end of the stem into the liquid. As the days get hot and the plant gets thirsty, the Roundup is absorbed into the plant. It takes awhile, but this even works for sticker bushes.
That's a mandevilla. I am so happy that I got a mandevilla bloom inside the house in the winter, late February. I am zone 5. These indoor blooms are a treat for me.
To get rid of all vines, flowers, weeds, etc., without using harmful chemicals, just cover with old carpet or cardboard or anything heavy that blocks the sun. It will kill it safely without adding toxins to the earth.