In much of Florida, soil and sand are almost synonymous terms. Typical soils allow rapid, downward movement of water and many nutrients. Thus, they dry out quickly and are not compatible with plants having high water and nutritional requirements.
Sandy soils are more likely to allow leaching of chemicals into groundwater and waterways.
The simplest way to avoid these problems in the landscape is to use only plants that are compatible with the site. If you want a vegetable or rose garden, be prepared to modify, or amend, the soil. In that case, frequently add organic matter, such as compost, to the planting bed. This will retain moisture, provide nutrients and attract beneficial organisms like earthworms. However, many lots contain fill dirt from other areas, so site-specific pH testing is a good idea.