Hi Hedge. I was hoping that you would see these pictures as I know you are interested in cacti. I am afraid I have very little in the way of help for you. I have germinated cactus seeds from perhaps 15 or more different genera but have had problems with Gymnocalycium. Some need to be refrigerated for a period of time but I can't remember if Gymno is one of those. I simply used a commercial cactus mix as a seed medium and planted them in shallow rows made with a toothpick. I only covered every other row and if I remember correctly, I didn't see a great deal of difference between the covered and uncovered seed. I germinated them in a south window and used a clear plastic dome to keep the humidity up. Some say that a fungicide should be used, but I never found it necessary. Some germinate quite rapidly (probably a survival mechanism in nature) in about 3-5 days, but others took forever! I prick them out into small pots when they reach ~1/2" tall. Perhaps someone with some real knowledge will chime in and give you some solid advice. In the above pictures, the orange flowers are of Echinocerus pentalophus and the pink ones are of a Trichocerus/Echinocerus/Lobivia hybrid. Good luck with your seed, Hedge.
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