Hi Karen: That was interesting about your using the APS-12 system, which I immediately looked up. (I usually start seeds in the BioDome system with the little sponges, but I have learned here that the tiny begonia seeds need seed starting mix.) I'm going to try the APS system, and I had a question regarding the "Germinating Mix" that Gardener's Supply sells with the APS system, which is a mixture of sphagnum peat moss and vermiculate, with some trace minerals. I discovered two different bags of seed starting mix in my basement, and I wondered if you or the others seed-starting mavens on this thread could recommend which would be better for general seed starting? They seem very different in composition.
"Hoffman Seed Starter": sphagnum peat moss (50-60 %); vermiculite; limestone (PH adjustor); wetting agent
"Natural Beginnings Seed Starting Mix": coir; perlite; worm castings; mealworm guano
