What is the primary characteristic of sand in greenhouse management?

In greenhouse management, sand is primarily valued for its ability to provide good aeration and drainage. This characteristic makes it an excellent component of potting mixes and growing media. The coarse texture of sand allows air to move through the soil easily, which is essential for healthy root development as it ensures that roots receive adequate oxygen. Additionally, sand facilitates drainage by preventing the soil from becoming waterlogged, thus reducing the risk of root rot and other moisture-related issues that can adversely affect plants.

While sand is indeed often sterile and can contribute to a more structured growing environment, its real strength lies in promoting optimal air and water movement in the soil. This is why it is commonly incorporated into various soil mixes, particularly for plants that prefer well-draining conditions.