I started adding shale to my soil 3 years ago...I have both loamy soil & clay fill on my property. It does wonders to help loamy soil retain more moisture & helps clay allow roots to grow better & not compact so tightly. I add shale & compost with all new plantings to ammend the soil. It is the best thing I've found to allow my plants to flourish!
I keep a 40lb bag on hand & do add it to my potting soil!
I also like to use this soil for my containers that already has it in it...
Vortex™ Potting Soil from Lady Bug Natural Brand... High performance formula consisting of a blend of five beneficial compost, mineral sand, expanded shale and perlite.
Hope this helps,
Lila
