Premium potting mix contains peat moss, screened mulch, compost, and perlite. Pearlite is a white mineral that improves aeration in the soil, while peat moss will add more acidity to your soil and lower your PH levels. If you have poor aeration and yellowing leaves on your plants, this may be the fix you need. Peat moss and perlite retain moisture, but allow water to run through and release heavy metals. This potting mix can also be planted directly into, so this is an excellent product for indoor starts. It will promote healthy root growth and production. -Our potting mix is screened to ⅜”-