Answer: Bags of potting soil seldom list their specific contents or the ratio of ingredients; the best way to judge what is inside is by lifting the bag. A heavy bag probably contains more clay; the soil inside is dense and won't hold as much oxygen. A light bag contains more peat moss and less clay, which allows more oxygen and moisture around roots. You can simply purchase any brand of potting soil and amend it with peat moss to acidify it, bringing the pH down to 5.0 Peat moss improves the balance of air and water, and also softens soil texture for good root growth. It contains no nutrients, but has a low pH (between 4.0 and 5.0) that benefits alkaline soils. If peat moss dries out, it shrinks and sheds cold water. To re-wet, mix thoroughly with hot tap water before using, or stand plants in pots that contain dried-out peat-based mix in a bucket of warm water until thoroughly wet.
Hope this information is helpful.
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