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Surfacing sand: calcareous or quartz?
vincent posted a topic in PinguiculaHi everyone, I'm about to receive some Mexican pinguiculas, and I am planning to put some pure sand on top of the mix as surfacing. The aim is to avoid algae development. So, the question is: which sand? Calcareous (same as I'll put in my mix), or the usual carnivorous plants one (quartz)? Did anyone compare these 2 side-by-side, to have an idea of what is best? I noticed a lot of moss development in the pot where I have my Nepenthes campanulata with calcareous gravel surfacing.