I have what seems to be Wild Grape Vines killing off my hedges. Is there any other recourse besides uprooting them all? Clipping them and spraying stump rot another possibility?
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The shortest answer is no. I have grape vines all over the property, and they will re-sprout from any stems underground, and from any roots thicker than 1/4" in diameter. The best method to remove them, in my experience, is to trim the hedge bushes 8" from the ground, with the crowns cleaned out, and cut everything else out to the ground level every few weeks. Tearing the roots out in moderation may help, but excessive digging will greatly weaken the hedge. This will be difficult at the beginning, but it looks great and well cared for when your done, and the vines underneath will eventually weaken due to the loss of photosynthesis. Also, putting a two foot wide strip of water-penetrable plastic down under each side of the hedge, leaving space for the bushes, and then adding a three inch layer of dyed wood chips helps greatly in keeping down weeds, and also looks great. Again, this is labor-intensive at the beginning, but eventually will come down to adding a new layer of mulch yearly, and cutting off all alien vegetation at ground level, plus the maintenance of the hedge itself.
Let me just say to begin: I... HATE... GRAPEVINE. While it's considered a decorative plant by many, for me it's become an insidious weed that resist my best efforts to eradicate it from my yard. I want to get rid of it because the previous homeowner didn't take care of it, and as a result its unchecked growth has resulted in my deck sprouting new shoots up between the boards all through the spring and summer, one of my fences having been systematically dismantled by vines creeping between structural members, and one of my trees looking like a scene from a haunted forest. It grows anywhere and everywhere it's allowed to, and except for a limited time during early summer when it flowers, it honestly doesn't look all that great (just a big green mess over whatever it's covering; with its 3-leaflet pattern it resembles poison ivy, and would you want THAT in your back yard?).
So, how to kill it. In the olden days, 2,4,5-Trichlorophenoxyacetic acid (2,4,5-T) mixed in fuel oil was recommended by the Forestry service to clear grapevine from tree stands. That's how hardy this stuff is, that you'd need to use the banned highly-toxic half of Agent Orange mixed with diesel fuel to have the best success. Weed-B-Gon (there are several formulations; look for ones containing 2,4-D and/or Triclopyr among the active ingredients) is effective at controlling young grapevine shoots and "beating back" overgrowth, but grapevine is "modular" enough that spraying it on outlying shoots will not kill the plant altogether. These chemicals are also uncommonly effective at killing "woody" plants, including grapevine but probably also the shrub they've infested.
The best solution I've found is physical dismemberment coupled with surgical herbicide use. To really kill it, you have to find the main root, sever it close to the ground, then poison what's left (otherwise the root will grow new shoots). So, I would recommend buying a concentrate product containing Triclopyr, cutting the vine off about 2 to 3 inches above the ground, and then painting the concentrated mixture onto both sides of the cut vine. Also watch out for basal roots (also known as "suckers"). Grapevine can throw one of these down wherever it touches earth, allowing that part of the plant to continue to thrive long after you've found and killed the main root system;
Once the vine has died off, you now have a bunch of ugly withered vine in your shrub. The temptation may be to simply rip it out. DON'T DO THIS if you value the shrub. Grapevine uses a combination of adhesive tendrils and a twisty vine growth to attach itself to its climbing frame (be that another plant, a fence or trellis, or a brick wall). The adhesive remains long after the plant has died, and the vine itself is uncommonly sturdy. The best way to remove it is to cut it out. With a pair of pruning shears (and maybe a pair of bypass loppers for the heavier cuts) sever every Y-joint in the vine's structure that you can see, before gently but firmly pulling these disconnected pieces out. Never yank; if it doesn't lift out, cut away what you've been able to physically remove from the shrub and then go back in to pull more of it out.