Hi Tim.
I don’t use Pon, but I do use an all mineral substrate for all of my 15+ houseplants. Turface/chicken grit. Ratio varies by species.
I couldn’t be happier, honestly, and highly recommend it. Plants LOVE it. But not very “permie” tbh. I’d probably end up divorced if I tried using fetid swamp water to fertilize my rock-planted leafchildren indoors.
