Organic soils are soils that are made from decomposed plant or animal material. Sphagnum moss, manure, composted bark fines, and decayed leaves or grass can create organic soil. Because they are made of decayed material, organic soils can contain good nutrients for your plants. You can make your garden soil more organic by buying organic soil or soil amendments and working them in.
There are many types of amendments that can be mixed into your native soil to add organic matter.
This is the soil amendment you can make yourself, for free. You can use decayed organic materials such as grass clippings, leaves, fruit and vegetable food wastes, and coffee grounds. Put it in a compost pile and let it decay. The result is a rich organic amendment. If you don't want to make your own, you can buy it in bags or bulk.
Commercially available manure is rich in organic nutrients. But remember, not all manure is alike. Look for farm manure from steers, cows, or chickens that has been mixed with bedding material and allowed to compost for at least 2 months.
This material comes from decomposed peat moss mined from bogs. It has lots of nutrients and excellent water-holding capacity. Use it on your acid-loving plants such as azaleas and rhododendrons.
Leaf mold is a great source of nitrogen and potassium for your soil. Better yet, it costs you nothing since you make it by composting your own leaves.
Sawdust made from trees, trimmings and bark helps to improve the drainage and texture of organic garden soils. Mix it into your organic soil for a light, airy texture. Be careful not to use sawdust from treated lumber, because of the chemicals used to treat it.
Of course, you can save yourself the trouble of making, buying, and mixing separate amendments altogether. Instead, go for a blended garden soil, such as Miracle-Gro® Organic Choice Garden Soil.