Many places sell soil amendments to help the gardener grow the best crop they can. When we look at nature, we notice the constant supply of dead, decomposing material littering the ground. This is the way the soil is constantly replenished. The composting of leaves and grass and non-animal kitchen wastes in our gardens results in the most useful organic material that can be added to our soil. The needs for other amendments vary, but can be determined by soil testing.
Organic content is the most important feature.
Research shows that compost can be the single most effective soil additive for strong growth and disease resistance. Organic compost is sold by the bag or truckload from reputable suppliers if you cannot make enough of your own. If you purchase large amounts of soil amendment make sure you receive a list of ingredients. Some suppliers may try to sell useless amendments that have no value in our gardens. The secret of a well-nurtured organic yard and garden is to let the natural process of decomposition take place.