Clay soils stay warmer longer in the fall. Clay particles are the smallest sized soil particles. Soil high in clay content has reduced pore space for air. Clay soils become water logged quicker and do not drain well. These soils are slow to warm up in the spring and should never be worked when wet because the structure will be ruined.
Clay soils are easy to compact.
Additions of organic matter are recommended regardless of whether the soil is too high in sand or clay. Organic matter retains moisture and provides a source of nutrients, which is important in sandy soils. In clay based soils, organic matter binds the small clay particles together creating larger pore spaces for air. Drainage and structure is improved. The pH of the soil is a measure of the acidity or alkalinity of a soil.