Bluegrasses do very well on the sandy limestone soils of central Kentucky, another reason that the 'Sport of Kings' flourishes there. A well drained soil that is fit for forage will be even more fit for horses if it is fairly level or rolling. Steep slopes are not ideal, nor is land with stagnant standing water. In contrast, limestone bedrock forces water to travel laterally across its surface, and the result is often natural springs offering mineral-rich water. Whatever the soil type, it is important that it not be too high in clay content.
Clay soils can be very slippery for horse hoofs when wet.
The amount of acreage needed to keep each horse fed depends on climate, vegetation, and time of year, but the average is around two acres per horse. Good grass is good for horses. Even so, some horses need other feed supplements in order to maintain optimum health. In the winter, pasture production typically falls well short of what horses need, and fine quality hay is offered instead. It is often easier to add vitamin and mineral supplements to a horse's feed than to add fertilizers to the soil.