Okay... I use DG for my bougies. Arizona is essentially a huge granite pit so I mine from the back yard. Have to use a mask due to the risks of contracting Valley Fever(like I need to worry about catching something else these days)stability is granite grit.
Which would you suggest for better water retention DG or Lava? ... I have both black and red. From all I have read Montezumas are essentially desert tolerant Baldies to put it simply.