How do I cut weeds growing through my Ottawa driveway cracks?

Weeds growing through driveway cracks are a common Ottawa problem, especially in spring and summer. You can cut them with a string trimmer, pull them by hand, or use targeted herbicide application, but addressing the underlying crack that allows soil and seeds to accumulate is the permanent solution.

The most effective immediate approach is using a string trimmer (weed whacker) to cut weeds at ground level. This works well for grass and broadleaf weeds growing through asphalt cracks or between interlock pavers. For stubborn weeds with thick stems, use a sharp knife or hand weeder to cut below the surface. Hand-pulling works best when the soil is moist after rain, as you can often extract the entire root system.

Chemical control can be highly effective for persistent weeds. Glyphosate-based herbicides (like Roundup) kill weeds down to the roots when applied directly to the foliage on a calm, sunny day. For organic options, white vinegar with high acetic acid content (20% or higher) burns weed foliage on contact, though it may require multiple applications. Boiling water poured directly on weeds provides immediate results but only kills what it contacts. Always follow label directions and avoid spraying on windy days to prevent drift onto desirable plants.

Ottawa's climate creates ideal conditions for driveway weeds. Spring snowmelt and summer thunderstorms wash soil and organic debris into cracks, creating perfect growing medium. Our freeze-thaw cycles widen cracks each winter, allowing more soil accumulation and larger weeds the following growing season. Dandelions, plantain, and crabgrass are particularly aggressive in Ottawa driveways because they tolerate the harsh conditions and salt exposure.

Prevention is more effective than repeated cutting. For asphalt driveways, fill cracks wider than 5mm with rubberized crack filler before weed season begins. This eliminates the soil-filled crevices where seeds germinate. For interlock driveways, remove old polymeric sand from joints, clean thoroughly, and reapply fresh polymeric sand, which hardens when activated and resists weed growth for 3 to 5 years. Regular sweeping removes debris before it can decompose into growing medium.

Professional crack sealing is worthwhile for asphalt driveways with extensive cracking. Hot-pour crack filler applied by a contractor creates a permanent seal that flexes with freeze-thaw movement and prevents both weed growth and water infiltration that accelerates crack widening. This typically costs $2 to $5 per linear foot but eliminates the annual weed battle while protecting your driveway investment.

For severe weed problems indicating widespread base settlement or drainage issues, the cracks may be symptoms of deeper structural problems requiring professional assessment. Weeds growing through large gaps or heaved sections suggest the driveway base has failed and needs repair beyond simple crack filling.

Need help finding a contractor for driveway crack repair or sealcoating? Ottawa Driveways can match you with local paving professionals who can address both the weeds and the underlying crack problems permanently.