I'm really not intending to be a smarty pants, but are we talking about potting soil, or the .99 bags of compost you buy at the store?
If you've ever had to buy real potting soil, then you'd know it is actually referred to as a soil free mixture, and it already contains good amounts of peat moss and vermiculite, perlite, and other key ingredients.
It just seems odd to me that someone would mix potting soil at a ratio of 50/50 with peat moss, or 75/25 with vermiculite since it already contains these things as an alternative to dirt.
If you've ever had to buy real potting soil, then you'd know it is actually referred to as a soil free mixture, and it already contains good amounts of peat moss and vermiculite, perlite, and other key ingredients.
It just seems odd to me that someone would mix potting soil at a ratio of 50/50 with peat moss, or 75/25 with vermiculite since it already contains these things as an alternative to dirt.