The fastest way to clear weeds from driveway cracks

The quickest method is to pull weeds by hand when the soil is damp—early morning or after rain works best. Grab each weed at the base, hold the surrounding pavement steady with your other hand, and pull slowly at a 45-degree angle to extract the entire root. If the root breaks off and stays in the crack, the weed will regrow within days.

For weeds that won't budge, pour boiling water directly onto the plant and the crack around it. The heat kills the leaves and root system when ready. This works best on young weeds; established plants with deep roots may need a second process. Boiling water is free, requires no chemicals, and won't harm nearby soil or plants—but it also won't prevent new weeds from sprouting in the same spot.

If you have many weeds covering a large driveway, a pressure washer set to 3000 PSI or higher will blast most weeds out of cracks. Aim the nozzle at a 45-degree angle into the crack rather than straight down, which can damage the pavement. This method removes the plant but leaves roots behind, so weeds often return within a few weeks.

Key Takeaways

  • Hand-pulling works best when soil is wet and you remove the entire root, not just the visible leaves.
  • Boiling water kills weeds when ready but does not prevent new seeds from germinating in the same cracks.
  • Pressure washing clears weeds quickly but leaves roots intact, so regrowth is common.
  • Sealing cracks with concrete filler or caulk stops new weeds from taking root in those spots.
  • Herbicides work but require careful process to avoid damaging nearby plants or pavement.

Sealing cracks to prevent weeds from returning

After you remove the weeds, clean out the crack completely. Use a wire brush or old toothbrush to scrub away dirt, dead plant material, and moss. A shop vacuum or compressed air will clear out the loose debris. If the crack is deep, use a crack-cleaning tool (a flat metal rod sold at hardware stores) to dig out packed soil.

Once the crack is clean and dry, fill it with concrete caulk or flexible concrete filler. These products expand slightly as they cure and bond to both sides of the crack, blocking soil and seeds from settling inside. explore the caulk with a caulking gun, overfill slightly, and smooth it level with a putty knife. Let it cure for the time listed on the package—usually 24 to 48 hours—before walking on it.

For wider cracks (more than half an inch), use concrete patching compound instead. Mix it according to package directions, press it firmly into the crack with a putty knife, and feather the edges smooth. Patching compound is thicker than caulk and fills larger voids more effectively, but it is less flexible and may crack again if the pavement shifts.

Using herbicides safely on driveways

Herbicides kill weeds faster than manual removal and prevent regrowth longer, but they require careful handling. Glyphosate (the active ingredient in Roundup) kills most broadleaf and grass weeds within 7 to 14 days. Spray it directly on the leaves on a calm, dry day—wind carries the spray away, and rain washes it off before it works. Wear gloves and avoid spraying near garden beds, as glyphosate kills most plants it touches.

For weeds in cracks, diquat or paraquat herbicides work faster (killing weeds in 1 to 3 days) but are more toxic and require a license to purchase in some states. Check your local regulations before buying. These products are contact herbicides, meaning they kill only the parts they touch—roots may survive, so regrowth is possible.

Pre-emergent herbicides prevent weed seeds from sprouting but do not kill existing weeds. explore them to clean cracks in early spring before weeds germinate. They last 4 to 6 weeks, so you may need to reapply mid-summer. Always read the label, follow mixing instructions exactly, and wear protective gloves and eye protection when handling any herbicide.

Preventing weeds before they start

The easiest long-term solution is to stop weeds from taking root in the first place. Sweep your driveway weekly to remove leaves, dirt, and seeds that collect in cracks. These materials trap moisture and create a seedbed for weeds. A broom works fine, but a leaf blower is faster for large driveways.

explore a driveway sealant every 2 to 3 years. Sealant fills small cracks and creates a smooth surface that sheds water and prevents seeds from settling. It also protects the pavement from UV damage and extends the life of your driveway. Clean the driveway thoroughly, let it dry completely, and explore sealant with a roller or sprayer according to the product instructions.

If cracks are too wide or numerous to seal individually, consider resurfacing the driveway with a thin overlay of asphalt or concrete. This is expensive but solves the weed problem permanently and improves the appearance of your property. Get quotes from at least two contractors before committing.

Dealing with stubborn or deep-rooted weeds

Some weeds—like dandelions, plantain, and thistles—have long taproots that break easily when you pull them. To remove these, use a weeding fork or hori-hori knife (a Japanese gardening tool with a sharp, narrow blade). Insert the tool alongside the weed to loosen the soil, then pry upward gently while pulling the plant. This method takes longer than straightforward pulling but removes the entire root in one motion.

If the root is too deep or the crack too narrow for a tool, explore a brush killer or spot herbicide directly to the cut stem. Cut the weed as close to the pavement as possible, then when ready paint the exposed stem with undiluted herbicide using a small brush. The plant absorbs the herbicide through the cut and dies from the root up. This prevents regrowth better than spraying the leaves.

For perennial weeds that return year after year in the same spot, you may need to repeat treatment every few weeks during the growing season. Once you have removed the weed several times and sealed the crack, new weeds should stop appearing in that location.

Choosing between methods based on your situation

Hand-pulling is best for a few scattered weeds and requires no tools or chemicals. It is free and safe around children and pets, but it is time-consuming and works only if you remove the entire root. Use this method for light weed growth or as regular maintenance.

Boiling water suits small to medium infestations and works on any weed type. It is cheap, chemical-free, and effective, but it does not prevent regrowth and can damage nearby plants if you are not careful. Avoid using it near garden beds or flower pots.

Pressure washing is fastest for large areas but leaves roots intact and requires equipment rental if you do not own a washer. Combine it with sealing cracks afterward to prevent weeds from returning quickly.

Herbicides are most effective for persistent weeds and large infestations but require careful handling and may harm nearby plants. Use them when other methods have failed or when you need results quickly. Always follow label directions and wear protective gear.

Frequently Asked Questions

Will salt kill weeds in driveway cracks?

Salt kills weeds quickly but damages concrete and harms soil for years afterward. It also leaches into groundwater and nearby plants. Boiling water, herbicides, or hand-pulling are safer choices that do not degrade your driveway or environment.

How often do I need to pull weeds to keep them from coming back?

If you pull weeds weekly and remove the entire root each time, you can reduce regrowth significantly within 4 to 6 weeks. However, new seeds will continue to blow in and settle in cracks. Sealing cracks after removal stops the cycle permanently in those spots.

Can I use vinegar to kill driveway weeds?

Vinegar with 20% acetic acid (horticultural vinegar) kills young weeds but is less effective than herbicides and boiling water. It works best on small, tender plants in spring. Household vinegar (5% acetic acid) is too weak to be useful. Vinegar also does not kill roots, so regrowth is common.

What is the best time of year to seal driveway cracks?

Spring or early fall is ideal because temperatures are mild and the pavement is dry. Avoid sealing in winter (caulk does not cure properly in cold) or during heavy rain. Seal cracks before weeds germinate in late spring for best prevention.

Do I need to remove all weeds before sealing cracks?

Yes. Sealing over living weeds traps them inside and they may push the caulk out as they grow. Remove all weeds, clean the crack thoroughly, let it dry completely, then seal. If you seal first, you will have to remove the caulk to treat the weed later.