So mixing potting soil, excellent potting soil, is the essence of good permaculture gardening. Today we've started with about a half a barrow full of well rotted cow manure, this has some sand and some saw dust mixed in. I'm not to thrilled about it, but like I was saying, this mixing of soil is more of an art form than a science, so there is no absolute formula. You want to keep in mind the general blend of ingredients. Obviously if we use pure manure, we'd have way too rich of a mix. So we immediately want to bulk up our mix with some peat moss. Peat moss is an organic product, mind in pea pods, and it doesn't have much in the way of nutrients, but it's going to give our soil a little body, and it's going to give the soil some water retention capacity. So, now we've got the peat moss and the manure mixed together. You notice I did not measure, I'm using more intuition than calibration here. So we got peat moss mixed with manure, and now I'm going to add perlite, being very careful not to breath the perlite dust, it's not a good thing. Perlite is again, an organic mineral, actually a volcanic mineral substance. And the perlite is going to add bulk and again, aeration and water retention capacity to our mix.