Shall I nuke the suckers? (Weeds)

I don't want to use weedkillers or any pollutants on the paths because they may not always be paths. The plot is still evolving so Gaud knows what it will be like next year.
Somewhere in my shed I have a blowtorch attached to an airosol bottle I used for soldering copper tubing on my central heating system. If I can find it, and even though it will involve a lot of bending, it may give me an idea of how a gas torch will perform.

If I gaffer tape it to a cane I may not need to buy a new one!