Peat is the surface organic layer of a soil that consists of partially decomposed organic matter, derived mostly from plant material, which has accumulated under conditions of waterlogging, oxygen deficiency, high acidity and nutrient deficiency.

What is peat soil good for?

Peat moss helps the soil hold nutrients by increasing what is called the CEC or "cation exchange capacity." Peat moss has a low pH, so if you use much, lime should be added as well. Plants that do well in acidic soils, termed "ericaceous" such as blueberries and rhododendrons, benefit from peat moss.

Is peat soil good or bad?

Many gardeners trust peat as a growing medium. But it's not always ideal. It is a poor mulch, quickly dries out, and is easily blown away. Peat compost alternatives have been refined over many years to provide a fantastic growing medium.