Dec 9, 2019 #2 bobrown14 Well-Known Member Grow Journal of the Month December 2017 Photo of the Month May 2020 Yes - I use basalt - paramagnetic rock dust. Quite a bit to my soil mix actually. Like 4-6 cups per cubic foot (7.5gal soil mix). I use whats called flour its pretty fine grind. Not granulated but flour. This is how we simulate the clay layer in a natural soil but in a container. The granulated is too course.
Yes - I use basalt - paramagnetic rock dust. Quite a bit to my soil mix actually. Like 4-6 cups per cubic foot (7.5gal soil mix). I use whats called flour its pretty fine grind. Not granulated but flour. This is how we simulate the clay layer in a natural soil but in a container. The granulated is too course.