- Home
- Gardening, lawn and landscape
- Lawn and turfgrass
- English
- Español
Q:
Is there a solution I can spray on dandelions instead of pulling them up? Not Roundup.... does vinegar, dawn soap and Epson salts work? Or is there a better one?
A:
Dandelion plants are difficult to kill because of the long (6-18 inches long) tap root, small pieces of which can grow again. Dandelions are perennial weeds, living several years. They lose their leaves in the fall, then grow again in the spring.
The best time to control them is in the fall when dandelions are transferring sugars from the leaves down into the roots for winter storage. At this time herbicides will also get taken down into the roots to help kill the dandelion. Triclopyr (brush killer) is effective against dandelions, and does not kill grasses. Be sure and carefully read the instructions on the herbicide container for proper dilution, safety and application rates.
Household vinegar is not strong enough to kill dandelions.
Household vinegar is not strong enough to kill dandelions. Household vinegar is only 5% acetic acid. Horticultural vinegar which is used to kill weeds is 20% acetic acid. That's a very strong acid and can cause significant injury to you. Using horticultural vinegar requires gloves, long sleeves and pants and a mask so you don't get it in your eyes. The other problem with vinegar is that it kills the leaves, but the tap root remains, so the dandelion comes back.
Dawn detergent won't affect the dandelion, and epsom salts are magnesium sulfate. If your soil is deficient in magnesium epsom salts can provide it, acting like a fertilizer.
How to control dandelions without herbicides
- Pull the dandelion when the soil is soft and moist and much of the tap root can be removed. You can also cut off the dandelion 4-5 inches below the surface.
- Spread wood chips or shredded bark as a mulch at least 3 inches deep over the area to prevent light from reaching the leaves. Leaves need light to function, so blocking light will eventually starve out the weed.
- Cut off dandelion flowers to prevent them going to seed and spreading the weeds further.
Use pesticides safely!
- Wear protective clothing and safety devices as recommended on the label. Bathe or shower after each use.
- Read the pesticide label—even if you’ve used the pesticide before. Follow closely the instructions on the label (and any other directions you have).
- Be cautious when you apply pesticides. Know your legal responsibility as a pesticide applicator. You may be liable for injury or damage resulting from pesticide use.
Want to learn more about this topic? Explore more resources from OSU Extension:Lawn and turfgrass, Weeds
Was this page helpful?
Related Content from OSU Extension
Yellow toadflax and Dalmatian toadflax are non-native plants that have become two of the most troublesome invasive weeds in North America. Infesting forests, range and grasslands, and other areas, these two weeds ... Dale K. Whaley, Gary L. Piper |Mar 2017 |Extension Catalog publicationPeer reviewed (Orange level)Yellow and Dalmatian Toadflax
Forage quality of common pasture weeds was determined through laboratory testing to compare feed value of weeds to desirable forage species and nutrient requirements for grazing livestock. Shelby Filley, Andy Hulting, Amy Peters |May 2010 |ArticleForage value of pasture weeds
Photo by Melissa Fery (Cropped from original) When moss grows in pastures, it's usually a sign of a deeper problem. Permanently getting rid of moss requires addressing the underlying problem, whether that's the condition of the soil or too much shade. Melissa Fery |Mar 2007 |ArticlePeer reviewed (Gray level)What’s that moss doing in my pasture?
This publication will take you through the steps needed to successfully plant a new lawn or renovate an old one. If you follow these steps, you will get it right the first time! Tom Cook |Mar 2002 |Extension Catalog publicationPeer reviewed (Orange level)Practical Lawn Establishment and Renovation
Photo: Devi O’Carroll (Cropped from original) Tansy ragwort is dangerous to livestock and human, and spring is the best time to battle a pasture infestation of the weed. Melissa Fery |Jun 2018 |ArticleHow to manage tansy ragwort
Photo: Andony Melathopoulos (Cropped from original) Do you have an eco-lawn? Learn more in this podcast episode with Dr. Allen is Professor of Landscape Management at Brigham Young University. Jul 2023 |Podcast episode241 - Rip out your lawn (and replace it with subalpine meadow)
Photo: Tim Walker / CC BY (Cropped from original) Moss will return if underlying reasons for its growth aren't addressed Kym Pokorny |Apr 17, 2017 |News storyIf you mind moss, get on board with preventative measures
Fed up with moss taking over your lawn? Oregon State University Extension Service turf specialist helps you learn about the conditions that encourage moss growth and the steps you can take to promote a healthy, moss-free lawn. Alec Kowalewski, Brooke Edmunds |Dec 2017 |VideoManaging Moss in Lawns
Tansy ragwort, an invasive weed that can harm certain types of livestock, is making a comeback in western Oregon. Find out how to control it and protect your animals. Shelby Filley, Andy Hulting, Gene Pirelli, Eric Coombs |Aug 2011 |ArticleTansy Ragwort
Ready for an alternative to grass? Here's how to get ready for something different. Kym Pokorny |Jul 10, 2020 |News storyWhen it’s time to say goodbye to lawn, uproot it first
Collection consisting of informational documents about lawn care in Central Oregon. Mar 2024 |CollectionLawns
Photo: Lynn Ketchum (Cropped from original) My so-called lawn needs help — it consists of clumps of grass with bare spots between. My small yard is completely fenced with a large apple tree shading much of it, so the grass gets at most 3 to 4 hours of sun ... Brian McDonald |Feb 2018 |Featured questionIs there a "no mow" lawn in my future?
Photo provided by Susan Kerr. (Cropped from original) Weed control is a constant challenge for ranchers and homeowners alike. The best way to control weeds is to create an environment conducive to healthy grass growth. Here's a detailed guide on how to do it. Susan Kerr, Tim Miller |Oct 2017 |ArticleVigorous grass growth is the best weed control
Photo: Ask Extension (Cropped from original) My front lawn has completely died off. After the big snowstorm in January, it started to turn yellow in spots and was very wet. Eventually the entire lawn yellowed and died out. I dug up a 1-ft square area a month ago... Claudia Groth |May 2017 |Featured questionIs my soil killing my lawn?
Credit: Alyson Yates (Cropped from original) A post-workshop evaluation found that 100% of respondents indicated that they planned to incorporate at least one item from the workshop into their management actions. Will Price |Mar 2024 |Impact storyExtension equips Baker County land managers to face the challenge of invasive and noxious weeds
Courtesy Judit Barroso (Cropped from original) An Oregon State University-led research team responded to the problem of glyphosate-resistant Russian thistle – a weed that infests nearly 5 million acres in the Pacific Northwest, and through four years of fieldwork, developed ... Larry Lutcher, Judit Barroso |Apr 2022 |Impact storyOSU research results in glysophate alternatives for wheat farmers
Credit Nicole Anderson (Cropped from original) The most critical steps growers can take to minimize seed shatter is to swath at optimal seed moisture and pay attention to which varieties are most susceptible to shatter. Nicole Anderson |Jul 2020 |Impact storyExtension grass seed study helps improve farm efficiency
Credit Oregon State University (Cropped from original) The OSU Extension Small Farms Program held OSU Mechanical Cultivation field days in 2018 and 2019. Clare Sullivan |Aug 2020 |Impact storyOrganic vegetable producers finding new ways to fight weeds
Have a question? Ask Extension!
Ask Extension is a way for you to get answers from the Oregon State University Extension Service. We have experts in family and health, community development, food and agriculture, coastal issues, forestry, programs for young people, and gardening.
Ask us a question