Top soil vs Potting soil in quality control
Recently, I purchased bag of the Acehardware topsoil, which was on sale for $0.99. The soil did look black, but I looked at the ingredient list and it said sand and peat. There was no indication of what PH the stuff is.
Actually, the reason I ask is that I was trying to do a raise bed to grow stuff that requires a lower PH. Soil test indicate the PH is around 7.5. I have plants that according to specification needs PH 7.0 or less. Instead of amending the existing soil with sulfur, I figured I could just start with lower PH soil. I thought getting topsoil would be better because I didn't want all that extra stuff that comes with potting soil.
In retrospect, may be that wasn't such a great idea. Topsoil is likely to be a local source, so PH is likely to be high, too. I am pretty sure topsoil is more than sand and peat. Potting soil is probably more consistently forumulated, particularly on PH?