Soil amendments are organic materials mixed into soil to improve plant growth and health, resulting in enhanced soil structure for better water storage, root development and soil ecosystems. Using soil amendments will increase the organic content of your soil so that the soil is more capable of holding nutrients and moisture.

Growing mediums, also known as substrates are soil-less or inert materials that retain moisture and support plant growth. Substrates are blended in with compost and other soil amendments to create a well balanced organic potting soil.