A clay soil is one that is made up of mostly clay particles. A simple test can be done to determine whether your soil is clay or not. Clay is typically very dense, and retains moisture well; it also tends to be nutrient rich which is good for attracting positively charged particles for healthy plant and grass growth. However, clay can also be slow draining, easily compacted making it difficult for root growth, and more alkaline. With the proper soil and lawn care plan in place, clay soil can be improved.