I know that this has been discussed before but the regulations have changed a bit (eg no glyphosate) - it is also, perhaps, an emotive issue.
At the front and side of our property we have a gravel drive and path - keeping this clear of weeds when we can only visit every 5-6 weeks is a challenge, it’s roughly 200m2.
Last visit my wife used some of this stuff
Which is a Pelargonic Acid based product - I guess it is the “safer” version of glyphosate acting on contact and not accumulating in the environment (in theory) and it seemed effective but arriving 6 weeks later the gravel is covered even worse than previously (in fact hard pushed to distinguish path from lawn in places).
The catch is that it is expensive - the local Weldom sells 910ml bottles (of which I need two) at 15.30€ each, at least it’s a bit cheaper at Leroy Merlin (20€ for 3l) but the closest store is Vannes.
I also get fairly good results from a heat gun (basically paraffin burner) which uses about a gallon of pétrole for the whole area but needs a re-pass a few days later.
Pathclear™ contains difluenican to prevent germination of new weeds but I can’t find any equivalent product in France.
Does anyone have any suggestions - the whole area is a bit too large to lay weedproof membrane and I’m not sure how much it will help anyway.
The only idea that I have at the moment is to look into a resin bound gravel solution - but that’s probably going to be at least 10k€ (and that buys a lot of weedkiller).