Designed to kill many woody plants and deep rooted perennial weeds, Lilly Miller 1 qt. Not ideal or natural. Got to love the Pacific Northwest natural vegetation! Of these, glyphosate (Roundup and other products containing glyphosate) and triclopyr (Brush-B-Gon, Blackberry and Brush Killer) are registered for use by home gardeners. Glyphosate formulated into a product with 41% active ingredient (a.i.) Another option is to use one of the commercial herbicides on the market. Hard work will pay off...No chemicals is always better, but you can try white distilled vinegar as a temporary fix. Just don’t broadcast it near anything you what to live. Spraying too early usually leads to poor control and regrowth of plants. Good luck, that’s a tough one and invasive, but I just love me some blackberries. Unless the blackberries are caught and removed when they are very young, they will not go away with the first attempt at eradication. Blackberries only fruit on new wood. Apply it several weeks before the bushes enter dormancy to give the herbicide time to reach the roots and kill the bush. A simple homemade vinegar solution works effectively to kill brush, weeds, and poison ivy. Where blackberry plants are encroaching and need to be controlled, they should be sprayed only after the plants have bloomed and good soil moisture is present. Look for them in the weed killer section of your local garden centers, under names like: Fast Acting Burn Out (St. Gabriel Labs), Nature's Glory Weed and Grass Killer and Blackberry and Brush Block (Greenergy). Bonus Tip: Corn Gluten. Or a product like Poison Ivy Defoliant. As a "pre-emergent" weed suppressant, it won't kill established weeds or plants but will prevent new weeds from growing. This product covers up to 4,000 sq. Available in granules, a fine powder or pellets, this natural byproduct of milling corn also works to keep weeds at bay. Concentrate Brush and Vine Killer is a great weed killer for use under decks, along fences and driveways and around patios and buildings. So if ya can’t kill … Salt is a great natural weed killer. Blackberry vines are notoriously difficult to eradicate. The boiling water, or salt/vinegar/dish soap may work, using several applications. If anyone has any tips for blackberry bushes removal please help. Use it in your driveway, patio, and if you’re in town, your sidewalk or walkways. Kitchen Plumbing on June 27, 2011. High strength (20%) horticultural vinegar weed killer. Pour one-half gallon of apple cider vinegar into a spray bottle, and spray the vinegar all over the brush, especially targeting the roots of the brush. To adequately control blackberries, the new wood must have fully emerged. Only thing I’ve found to kill blackberries, poison ivy, wild rose, briars etc.. is glyphosate. The key is persistence, and continuing removal treatments over several seasons. 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