Hi SouthPark
One thing I have in good supply is lava rock! It is used here for everything: drainage in pots, paths, driveways, mixing with concrete, mulch on top of 'soil' around plants, mixed with asphalt for road surfaces, etc etc.
I've debated with myself about using it for my Phals but I worry that I will damage the roots when I initially pot them in it and then anytime that I might have to repot - the pieces have such sharp edges! In your pics the pieces you use look much smoother/have rounder edges, or is that just the way it appears in the pics?
Most of my Phals are now in S/H using ECP after I discovered I could get ECP in the Cannabis Grow shop, but I like the idea of using a local, natural medium.
I can take a close up of my lava chips tomorrow but for now just a pic of the ever present heap in my garden!
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