Can I use vinegar or household products to kill weeds growing in my Ottawa driveway cracks?

Yes, white vinegar can kill weeds in driveway cracks, but it's only a temporary surface solution that won't prevent regrowth, and there are more effective approaches for Ottawa driveways.

Household vinegar (5% acetic acid) will burn the green tops of weeds within 24-48 hours, but it doesn't kill the root system. The weeds typically regrow within 2-4 weeks. For better results, use horticultural vinegar (20% acetic acid), which penetrates deeper and provides longer-lasting control. Apply on sunny days when temperatures are above 15°C for maximum effectiveness. Avoid spraying on windy days to prevent drift onto desirable plants.

Other household options include boiling water poured directly on weeds (kills on contact but requires multiple treatments), corn gluten meal as a pre-emergent (prevents seeds from germinating but doesn't kill existing weeds), and hand-pulling when soil is moist after rain. Salt water will kill weeds but can damage surrounding vegetation and isn't recommended near plant beds.

The real solution for Ottawa driveways is addressing why weeds are growing in the first place. Weeds in driveway cracks indicate that the surface material has deteriorated enough to allow soil accumulation and seed germination. For asphalt driveways, this means the sealcoat has worn away and cracks have widened. The permanent fix is filling cracks with hot-pour rubberized crack filler, then applying fresh sealcoat every 2-3 years. For interlock driveways, weeds grow when polymeric sand has washed out of joints. The solution is removing old sand, cleaning joints, and reapplying fresh polymeric sand, which hardens and prevents weed growth for 3-5 years.

Practical maintenance approach: Kill existing weeds with vinegar or hand-pulling, then address the underlying surface issue. For asphalt, plan crack filling and sealcoating in late spring or early fall. For interlock, schedule polymeric sand replacement. This prevents the weed problem from recurring and protects your driveway investment.

When to hire a professional: If you have extensive cracking, widespread weed growth, or haven't maintained your driveway in several years, the surface may need more comprehensive repair than DIY weed control can address.

Need help finding a driveway contractor for crack repair or maintenance? Ottawa Driveways can match you with local paving professionals for a free estimate.