At the bottom of my garden, i have a lot of things such as brambles growing by the fences that are coming through from some wasteland the other side, also the usual weeds growing between the slabs.
All i have at that end of the garden is a summer house and a shed, i don't intend to ever grow anything down there and was wondering what the best weed killer would be to use to stop ANYTHING from growing. It well away from anything i have growing in my own garden and even further away from any neighbours. I had been told bleach and water will work (which I'm sure it would) but I'm not sure how I feel about using it in due to the potential environment damage.
Does anyone have any experience of this kind of thing and what may be best to use?

If you are looking for a true soil sterilant, Pramitol will prevent growth for about a year, however I don't think it or anything equally effective would be considered environmentally harmless.

No matter what you use, eventually it will leach down into the water table or flow downhill to whatever or whoever is below you. I would use roundup (glyphosate) and try to keep it on the foliage, not on the soil. If you have a constant, every year weed problem in that area, you may have a re-seed problem - get those weeds early in the season or use a pre-emergent. I would never use bleach, its even more harmful to the environment than glyphosate.

Whatever you decide to do, wear your protective clothing and don't breathe.

to the site!
Looking up products available in England I found Kerb, Chikara, Sultan and Gem. I'm not familiar with the active ingredients, but you could ask about them at a garden center and see what they recommend.

Consider when killing weeds, regardless of your methods: sooner or later,something will take their place. Nature abhors a vacuum.

If you actually manage to kill all the existing weeds, it will only be a short time before something else replaces them. I would try to find a species to plant in their place - something which you can tolerate.

Lucy68 said: No matter what you use, eventually it will leach down into the water table or flow downhill to whatever or whoever is below you.
Whatever you decide to do, don't breathe.

greenriverfs said: Consider when killing weeds, regardless of your methods: sooner or later, something will take their place. Nature abhors a vacuum.

If you actually manage to kill all the existing weeds, it will only be a short time before something else replaces them.

When I first read this question.... My thinking was to just get a string trimmer....
Any of those chemical treatments will be deleterious.

Of course... You could just lay down some carpet... That'll stop all plant growth... until enough debris accumulates on top of carpet for seedlings to start...

While the railroad sprays harsh chems to prevent plant growth... You really need to stop and consider whether it would be healthy to live in such an environment.

Its a bad idea to completely strip the ground of plants. Soil gets compacted and doesn't hold water very well leading to erosion, etc. Also removing the plants is bad for the microbiota that helps everything grow and the wildlife that uses them for cover and food. And as pointed out above, something else will eventually grow in its place. I'd suggest either planting something native that you like in that spot or keep it trimmed.

Or perhaps brick paving around the summer house to prevent rampant weeds?