There is seemingly no end to miracle additives on the market, all offering gardeners the appealing promise that they will make your plants bigger or healthier - or possibly even both. Often there is little, if any, way of knowing whether or not they work the claims made by these products may simply not have been adequately tested, and sometimes it’s hard to tell what’s in them. There are at least three that should make you pause for thought before parting with your hard-earned cash: rockdust, biochar and mycorrhizal fungi.
Rockdust
Apparently there's almost nothing this finely ground
