Dig out as much of the weed as possible before cleaning out any remaining dirt or debris from the crack with water and a stiff wire brush. Allow the concrete to dry before continuing.
Aside from being aesthetically unpleasant, weeds poking through sidewalks pose several threats to your asphalt, and family. If left unattended, the weeds will thrive, grow and can eventually create severe concrete deformations and heaving, which is only mended by tearing out the slab. Larger weeds are also tripping hazards, and will continue to reemerge after countless applications of herbicides. Manually eradicate the weeds before prepping the cracks and applying a quick-drying joint sealant.
Spray the weeds with a 5-percent acetic household vinegar. Concentrate the spray on the weeds, reapplying several times over a two- to three-day period or until the weed tops and roots are dead.
Pack the crack tightly with sand before filling it with a quick-drying joint sealant. Cut the sealant’s tip and insert it directly into the crack. Squeeze the product into the crack and overfill to allow for the shrinkage that occurs after drying.
Allow the crack sealer to dry for 12 to 24 hours, or according to the package directions. Examine the crack and reapply, if necessary, to fill any remaining small holes or voids in the hardened product.
Just be cautious with commercial weed removers . These chemicals can wash away in heavy rain and wind up in your neighbor’s yard or even local water systems. Don’t over-apply, and follow instructions on the package to make sure you’re keeping yourself, your neighbors, and local wildlife safe.
If removing the weeds doesn’t work, you can try chemical warfare. One organic trick is to use standard kitchen white vinegar as a weed solution. Vinegar removes most weeds through acidifying and destroying their roots.
Weeds leave your driveway and sidewalks looking a little ragged. Luckily, removing them can be simpler than you’d think.
The problem is that water cools relatively quickly. If you’re using boiling water as a weed remover, you’ll need to have a kettle nearby constantly heating more. It’s probably the cheapest solution, but it’s difficult to use on more than a few plants at a time.
Ready to learn more? Then keep reading for details.
There’s also the safety problem with boiling water. It can hurt you just as easily as it can hurt plants. If you’re pouring boiling water over a plant, there’s a serious risk that it will splash and hit you. Unless you have a power washer that can heat and spray water well away from where you’re standing, boiling water isn’t the best way to handle weeds.
It’s a simple weed-removal method – just light them on fire. The heat should reduce the entire plant to the roots. However, it’s important to follow fire-safety guidelines with this method. Watch out for dry grass or sparks. You want to remove weeds, not burn down your house! This method is best used only for weeding in the middle of concrete slabs or patios, not in your yard or garden.
Use a Small Propane Torch
Have a great day. Thanks for reading!
Finally, if nothing else has worked, you can use heavy-duty weed removers. There are several weed removers that linger for months or years where they’re sprayed. “Extended release” or “year-long” guarantees are a good clue that you have something that will stick around.
The Spruce / Jayme Burrows
When to Kill Pavement Weeds
Kathleen Connolly has been an advanced master gardener and accredited organic lawn care professional for over 30 years. She specializes in lawn care, horticulture, and landscape design. Kathleen earned a Master's Degree in Landscape Planning and Design and Sustainable Land Use Planning and Design.
Before Getting Started
Here are some common, effective ways to control the weeds and grasses that infiltrate the cracks in paved surfaces. If a recipe calls for salt, make sure to limit its use to hardscape areas only; do not allow the salt to run into lawns and gardens.