Driveway weeds growing through cracks
Tools: crack weeder or old screwdriver, stiff broom, kettle, caulking gun · Materials: polymeric sand (pavers), asphalt or concrete crack filler, salt or horticultural vinegar (spot use only)
Steps
- Pull or dig out the weeds with the roots using a crack weeder; do it after rain when the soil is soft.
- Pour boiling water along the crack to kill remaining roots and seeds; repeat a week later.
- Sweep the cracks clean and dry them.
- Concrete or asphalt: fill cracks with a flexible crack filler from a tube so seeds have nowhere to lodge.
- Pavers: sweep polymeric sand into the joints, tamp, and mist with water so it sets hard.
Stop and call a pro if
- cracks are wider than 1 cm or the slabs are heaving — roots or frost are lifting the driveway
- weeds are woody (tree seedlings) — the roots may be under the slab
- you want to use herbicide near a lawn, a well, or a watercourse
What a pro does that you can't
A landscaper or hardscaper re-lays sunken pavers on a proper base, seals a whole driveway, and removes tree roots that keep lifting it.
DIY cost: $10–40 for filler or polymeric sand