Organic soilamendments can increase beneficial soil organisms, organic matter, and improve moisture retention. The following list contains a variety of soilamendments from animal... The right organic soilamendments will breathe new life into tired super soil both during a grow and when you recycle your substrate. By replenishing nutrients when your plants need them... Soilamendments contain these nutrients in varying amounts and can be used to supplement your garden soil if a nutrient is found to be lacking. Essential plant nutrients include Recommended Potting Soil & SoilAmendments for the northwest gardener. Swansons is pleased to offer a variety of high-quality potting soils and soilamendments... Amendments are added to soil to change and improve it. Unlike fertilizers, which add nutrients to soil, amendments modify the condition of the soil itself. Most soilamendments are added to improve the structure of the soil, to increase the organic content so that the soil is more capable of holding nutrients and moisture. A soilamendment can alter the soil’s physical properties, including texture, pH, and nutrient levels.Soilamendments can fix all that. They provide an array of benefits, including Fertilizers are also technically soilamendments, although most of them only improve the soil over the short term. Even slow-release fertilizers still only last until they are fully dissolved. Your garden soil is one of the most essential components to growing healthy plants. If it is in poor condition, you will need soilamendments to nourish it again. What SoilAmendments to Avoid. There are several common soilamendments that should be avoided