If you have an existing area of hard surface, you can rid it of weeds in one of the following ways:
- Carefully pour boiling water over them
- Remove them by hand with a sharp knife or trowel
- Use a flame or thermal weeder. These are particularly effective on young weeds.
You will need to repeat methods 1 to 3 every so often to keep on top of the weeds.
If you are creating a new path or patio, to minimise weed growth in future, make an impenetrable foundation layer: a geotextile membrane or a substantial mix of hardcore rubble and sand, firmly flattened to exclude all light and reduce moisture.