Are there ways to make your own media for growing plants from single cells, such as liquid culture media, from mostly natural ingredients? I am especially interested in formulas in which a plant protoplast cell can survive, which among other things means that the media used at the protoplast stage should not contain ammonia. All formulas I have found on the internet require lots of specialized artificial ingredients, but are there natural alternatives? One or two (maybe three) artificial ingredients are still acceptable, I am thinking of reducing the number of artificial ingredients from a long list to something more manageable. As far as possible, the ingredients should be easy to obtain from gardening.