Posted: 02/06/2016 at 07:23
Rock dust is finely ground volcanic rock from Scotland. It was marketed as Seer or verve , but now seems to be branded Remin. It is all the same. It is used to remineralize poor soils. up to a kilo per square yard can be applied, it works best when worked in by worms in a humus rich soil. The marketing people claim that the plants grow stronger therefore are more resistant to pests and diseases.
You can get it off of Amazon or from b and q
I used a one tonne bagful along with a couple of trailerloads of farmyard manure on my veg patch. I have not noticed any decrease in the slug population in the veg patch. I still drown a lot in slug pubs.