gritty mix - can't find gypsum!
I just picked up the three main ingredients for the gritty mix (granite, turface and fir bark fines) - which were not easy to find here in Toronto. What I couldn't find anywhere was gypsum. None of the garden centres I went to (of 4), nor any of the big box stores in the area.
What would happen if I omitted the gypsum? I also could not find "Foilage Pro" fertilizer, so have to stick with the ones I have - none of which seem to have calcium or magnesium listed in the extra nutrients. Is there an decent substitute for gypsum? Of course, if anyone knows where to find this locally, please let me know.
I'm planning to use this mix to re-pot my (slightly struggling) adenium arabicum.