A good gardener needs soil that is loose and crumbly A good gardener hungers for friable soil. It's a term to describe soil texture that is loose and crumbly, easily penetrated by roots and water. Soil takes on a friable texture when you work organic matter into it once a year. Even applications of mulch will gradually break down and improve soil, especially if you work older mulch into the soil before you add a new top layer.
Soil texture is determined by the proportion of each of the different-sized particles it contains.
Few of us are blessed with loamy soil. Most of us deal with a soil containing too much clay or too much sand. Clay just needs to be kept aerated so it does not compact and develop drainage problems that suffocate and rot plants. To improve clay, double dig your vegetable or flower garden. Sandy soils have problems retaining moisture and nutrients.