Will Vinegar Kill Canada Thistle?

Vinegar pesticides are available in certain garden supply stores, and some backyard gardeners already use it as a herbicide. But until today, no one has conducted a scientific test on it.

The first scientific proof that it might be a powerful weedkiller that is affordable and environmentally safe—ideal for organic farmers—is provided by researchers from the Agricultural Research Service.

In greenhouse and field trials, ARS researchers Jay Radhakrishnan, John R. Teasdale, and Ben Coffman examined vinegar’s effectiveness against common lamb’s quarters, gigantic foxtail, velvetleaf, smooth pigweed, and Canada thistle.

They evenly coated the leaves of the weeds by hand-spraying them with several vinegar solutions. The researchers discovered that weeds were eliminated in their first two weeks of existence by concentrations of 5 and 10 percent. Higher vinegar concentrations were necessary to destroy older plants. Vinegar showed a death rate of between 85% and 100% at the higher concentrations for all growth stages. About 5% of home vinegar is contained in a bottle.

One of the toughest weeds in the world, Canada thistle, found to be the most vulnerable; the 5-percent concentration had a 100% kill rate of the perennial’s top growth. This can be completed in around two hours with a 20% concentration.

Spot applications of 20% vinegar in cornfields eradicated 80–100% of weeds without endangering the corn, although the experts underline the need for greater study. An entire field would cost roughly $65 per acre to spray with vinegar. It may only cost $20 to $30 if used to treat small-scale weed infestations, such as those that may appear in crop rows following cultivation.

To meet the requirements of organic farming, the researchers only utilize vinegar made from fruits or grains.

What causes Canada thistle to die?

It is necessary to first comprehend what makes Canada thistle such a challenging weed to eradicate before beginning a control program. The Canada thistle can regrow from even a small piece of its enormous root network, which extends relatively deeply into the soil. As a result, there is no single, effective strategy for getting rid of Canada thistle. You will have to keep doing it whether you use chemicals or an organic method to control Canada thistle.

Making your yard and garden less welcoming to Canada thistle is the first step in getting rid of it. Although Canada thistle may grow everywhere, its ideal growing conditions are open spaces and low-fertility soil. Your preferred plants will develop better and be better able to compete with the Canada thistle if your soil fertility is improved, which will also weaken the Canada thistle. We advise taking your soil to your neighborhood extension service for testing.

Chemical Canada Thistle Control

Weed killers can eliminate Canada thistle. On sunny days with temperatures between 65 and 85 degrees F, this should be done (18-29 C.).

It is best to avoid using weed killers on windy days because many of them are non-selective and will kill anything they come in contact with. Use a paintbrush to apply the weed killer to the Canada thistle if you need to treat it in an area where it is close to desired plants.

Once you notice the Canada thistle has returned, repeat the weed killer application.

Organic Canada Thistle Control

Organic Canada thistle control requires a keen eye and even keener set of scissors. Simply locate the plant’s base and cut the Canada thistle off there. Avoid pulling out the Canada thistle because doing so could break the root, which would result in the regrowth of two thistles.

Every week, check the area and remove any new growth you may notice. By regrowing yet removing the new leaves, the plan is to drive the weed to expend all of its energy stores before it has a chance to replenish them.

Recall that organic methods of control are more environmentally friendly and should only be employed as a last option.

Will thistles be killed by vinegar and salt?

Unwanted thistle plants may be killed with a DIY herbicide comprised of vinegar and salt. To effectively kill weeds, the vinegar must contain at least 20% acetic acid. This sort of vinegar mixed with three teaspoons of table salt provides a potent DIY thistle herbicide. This combination should be applied to the undesirable plants once each week to help reduce the issue. Spraying plants you want to maintain with this mixture should be done with caution as it will also destroy them.

How can thistles be permanently removed?

For your lawn, use a broad-leaf herbicide containing 2,4-D or MCPP, and for your garden, use glyphosate. All plants are killed by glyphosate, thus you must be application-specific. Apply using a sponge, or cut thistle plants, insert a drop or two with an eyedropper into the stem.

How can I naturally get rid of Canadian thistle?

It is a challenging weed to manage because of its large root system, but there are efficient strategies to eradicate it. The USDA lists vinegar as one of the best methods for controlling Canada thistle. Canada thistle can disappear within a few hours if salt is added to the mix.

Will thistle die in hot water?

Boiling water kills weeds effectively and just needs a few supplies. The steps are listed below.

  • On a stove fire or an outdoor burner, start by bringing a big pot or kettle of water to a boil. You can estimate how much water you’ll need by looking at the size of the weeded area.
  • Use oven mitts to delicately transfer the water to the weeded area once it has reached a boil and reached a temperature of scalding hot.
  • Pour the boiling water on the weeds in your lawn, driveway crevices, or garden paths gradually while being mindful to keep it away from any desirable plants nearby.
  • As required, repeat the procedures above.

It’s not complicated, as you can see. Having said that, take into account these additional suggestions for the ideal weed control outcomes.

Wear Pants, Long Sleeves, and Closed-Toed Shoes

It’s crucial to keep in mind how harmful hot, boiling water may be if it gets on your skin. We advise against pouring hot water on weeds while wearing flip-flops and shorts because you run the risk of hurting yourself. To prevent accidently splashing any water on yourself, put on slacks, long sleeves, and closed-toed shoes.

A Tea Kettle is Easier to Pour than a Pot

A tea kettle can be easier to pour if there are valuable plants in the area you wish to conserve. Boiling water is one of the greatest natural solutions, but it can also kill any plants it comes into touch with. If there is an electrical outlet close to the weeded area, an electronic tea kettle can be a terrific solution.

Be Careful Transferring the Boiling Water

As soon as you remove the boiling water from the burner, it will start to cool, therefore it’s critical to move it as fast as you can to the weeded area. Having said that, move the hot water with extreme caution since it may spray or spill.

For maximum safety, you can think about boiling the water next to the weeds you intend to pull with an outdoor gas fire.

Cut the Weeds Down First

Consider trimming the weeds a little, especially if they are growing in big bunches, so that you can more readily reach deep taproots. This will enable more hot water to be applied directly to the roots, increasing the likelihood that the results will last.

Any weeds you remove should be properly disposed of to prevent regrowth.

In my garden, how do I eradicate Canadian thistle?

You can see Canada thistle plants, but they actually form a complex web of what appear to be individual plants thanks to a network of underground rhizomes. In fact, removing particular weeds can exacerbate the situation. When you pull it, it breaks, and the rhizome to which it is attached can produce two more plants to take its place!

To entirely eradicate them from your lawn or garden, a sustained effort is required. Here are a few ideas:

  • Start by using a pair of household scissors to cut the plants off at ground level. They will indeed regrow. But each time you remove one, the thistle’s capacity to generate food is diminished, gradually weakening the entire patch. The plants will eventually die if you keep cutting them off.
  • Use a weeding instrument like Grampa’s Weeder to eradicate certain plants if you’d prefer to pull the weeds.
  • If neither choice is feasible, using a high-quality herbicide to spray will produce effective results. Use a triclopyr- or carfentrazone-containing product. Canada thistles and other difficult broadleaf weeds can be controlled by powerful herbicides like Monetrey Turflon Ester or Gordon’s SpeedZone.
  • Bonide Weed Beater Fe is a natural option if you’d like that route. A non-selective, glyphosate-free substitute is Natural Armor Weed and Grass Killer, which will “Burn off only the surface growth; save the roots. That’s alright. Consider this as “cutting them off chemically rather than with scissors. Organic weed killers can require many treatments to be successful, and if used improperly, they can damage your lawn.

How quickly does vinegar destroy weeds?

A: Using commercial weed killers close to fruit or vegetable plants can raise safety concerns about some of the chemicals in those products. Is vinegar effective at killing weeds? You are fortunate. When used properly, vinegar can destroy weeds effectively. It is a natural herbicide and is equally safe to use while dressing a salad as vinaigrette. Additionally, vinegar comes in huge bottles that are affordable and practical for cooking and cleaning, so it is not a one-use item that will collect dust on a garage shelf.

Vinegar kills weeds quickly—usually within 24 hours—but it has no preference for the plants you want to grow or the weeds you want to destroy, so use it sparingly and under the correct circumstances. The concentration of the solution and the weather both affect vinegar’s effectiveness. A professional can handle the problem if the weeds are severe or if you are concerned about the integrity of your garden.

It’s best to leave some tasks to the experts. Get a free, no-obligation estimate from local, certified lawn service companies.

Do weeds die from home vinegar?

I abhor weeds. You do not? There are many different weed killers to pick from if you visit the gardening section of your neighborhood nursery or large box retailer. But what if there was a natural way to get rid of weeds without needing to buy one of those pricey weed killers? Did you realize that your cabinets likely contain a perfectly fine weed killer? Vinegar, that is! Yes, it is true that vinegar kills weeds, particularly when used in conjunction with dish soap.

You only need a spray bottle, dish soap, and vinegar to make your own weed killer. The vinegar’s acetic acid “sucks out the water from the weed, drying it out.” The vinegar works best when the cuticle, the plant’s outer covering, is broken down by the dish soap. See how to spot weeds in your garden below.

I have to say that I am quite pleased with the outcomes. The recipe for manufacturing your own vinegar/soap weed killer is as follows:

DIY Weed Killer Recipe

  • 1 gallon of 5% acetic acid vinegar
  • Dish soap, 1 ounce
  • bottle of plastic spray.

Spray the mixture onto weeds after combining the vinegar and soap in a spray bottle.

Application Tips

Here are some recommendations before using this weed killer in your garden:

  • Because vinegar/soap weed killer is non-selective, it will also harm or destroy your prized plants. So use caution when spraying weeds.
  • Apply on a wind-free, sunny day. The sun aids in the vinegar’s ability to dry the weed. Additionally, you should wait for a windless day to avoid accidentally spraying other plants with your spray.
  • The root of the weed may or may not be killed by your vinegar weed killer. If green growth begins to appear thereafter, you might need to reapply it. You can also spray some weed killer over the root zone to completely eliminate huge weeds.
  • Not all weed varieties will be eliminated with the vinegar/soap weed killer. Try it out in your garden to see what kinds of weeds it kills.

So the next time you need to get rid of weeds, just go to your pantry and get some vinegar and soap to manufacture your own weed killer. It’s organic, efficient, and affordable! Seek out more strategies for weed control.

How can thistles be kept from growing more?

Thistle is a perennial plant that has a long lifespan. Although young plants and seedlings are the easiest to destroy, there is hope for adult plants as well. To permanently get rid of thistle, persevere.

Seedlings and Small Plants

  • Prolific planting Seedlings of thistles begin to grow in bare, unlit soil. If you pull them, you might leave some of the root behind; over time, it will resprout. Plant closely all around the thistle in your flower or veggie garden. The sun-loving young thistle weeds eventually become weakened and die as your preferred plants ripen.
  • Wrap it up. Mulch smothers new plants and prevents the development of thistle seeds. Use it to cover bare soil around young plants as they grow.
  • Snip wisely. Snip little thistles in lawns at the soil line. Mowing does not destroy it, but it does stop it from maturing. The little plant must be constantly snipped in order to weaken and kill it. (This isn’t for a serious infestation; just a random thistle.)

Dig Them Out

Recall the discussion of rhizomes? Since one mature plant’s roots may stray into your neighbor’s yard, they make it difficult to remove thistles from your garden or lawn. However, it works well to get rid of bigger plants. As much as possible, dig into the soil with a pointed weeding tool to pull out the plant’s roots along with it. Although hand weeding tools are excellent for removing individual plants, avoid doing so on the entire lawn.

Break Out the Spray

You might eventually need to spray. This is specifically true for huge infestations and mature, blooming-sized plants. Start by removing mature plants from the ground an inch or two above soil level. Then, directly spray the cut stem with your preferred weed killer. Here are two trustworthy choices. Whichever option you select, make sure to read and abide by all label directions.)

  • The organic weed treatment horticultural vinegar (30%) is efficient, quick-acting, and natural. Just like any other spray, caustic acid should be handled carefully, so keep that in mind. It is suitable for sprinkling specific plants, not broad areas. Applying it in vegetable gardens or around delicate plants is not advised because it is an organic acid and might alter the pH of the soil.
  • Glyphosate is one of the several weed sprays that are readily accessible and works well on thistle. Apply to individual cut stems an inch or two above the soil level while carefully avoiding contact with desirable plants by aiming the weed sprayer away from them. For thistles that are well-established, another spraying may be necessary in a few weeks.