providing resources for identifying, growing and caring for flowers and other plants Go to source X Trustworthy Source Royal Horticultural Society Leading gardening charity in the U.K. While the risk to non-weeds will be relatively low, do your best to only treat the thistles with your herbicide. Then, follow the instructions on the label to mix and apply your herbicide. Buy a commercially-sold organic herbicide that’s formulated to kill weeds and read the label to make sure it won’t harm positive plants. Selective weed killers containing clopyralid or triclopyr will kill thistles without damaging the surrounding plants. If your thistles are in a curated garden, opt for a selective weed killer. However, if your thistles aren’t located in a garden, it may not matter much to you. This herbicide will kill any plants it comes in contact with, so you may have kill off some innocent bystanders when you go this route.
X Trustworthy Source Penn State Extension Educational organization dedicated to delivering science-based information to people, businesses, and communities Go to source Do not allow any pets or livestock to wander into the area while it’s being treated. Please check with your local laws and wear gloves, sleeves, a dust mask, and goggles if you apply it. Its use is prohibited in some states and countries. Please note: The WHO considers glyphosate to be a probable human carcinogen.
X Trustworthy Source EDIS Electronic database of the University of Florida Institute of Food and Agricultural Sciences's peer-reviewed articles Go to source Do this early in the growing season for the best results. providing resources for identifying, growing and caring for flowers and other plants Go to source Follow the instructions on the label to apply it to your thistles. Pick up a systemic weed killer that contains glyphosate, which is the most efficient ingredient at permanently wiping out thistles.
If you don’t mind killing the surrounding plants, this is the way to go.
This article has been viewed 415,419 times. This article received 14 testimonials and 100% of readers who voted found it helpful, earning it our reader-approved status. WikiHow marks an article as reader-approved once it receives enough positive feedback. There are 14 references cited in this article, which can be found at the bottom of the page. He holds an associates degree in Sustainable Agriculture from the University of Massachusetts Amherst. He is a Certified Permaculture Designer, is licensed Construction Supervisor in Massachusetts, and is a Licensed Home Improvement Contractor. Ben has over 12 years of experience working with organic gardening and specializes in designing and building beautiful landscapes with custom construction and creative plant integration. Ben Barkan is a Garden and Landscape Designer and the Owner and Founder of HomeHarvest LLC, an edible landscapes and construction business based in Boston, Massachusetts. This article was co-authored by Ben Barkan and by wikiHow staff writer, Eric McClure.
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