I am preparing a very hot, very dry area of my garden to become a scree garden. It will have a weed supressing blanket and the 5+ cms of small shards of slate. On top will be three very large planters with phormiums.
The ground previously had some shrubs, brambles and a few blackthorn growing in it. I have removed all the vegetation and dug out almost all the roots, only leaving small, thread like roots.
I have attempted to buy caustic soda to "sterilise" the soil before putting down the weed blanket but I have been told that the use of caustic soda is now banned here in France. I have been offered glyphosphate but it seems to me that this would be pointless on bare soil.