I jsut bought some hard winter wheat berries from WF while I wait for my sproutpeople order. I had heard that the best medium for growing was vermiculite, but I can't find it. The lovely people at home depot told my dh that pearlite is the same thing. I am pretty sure it's not, but as I have it here and my berries are done soaking and need to be planted...is it okay to use, both pH and nutrient wise?