What is a common characteristic of clay pellets as a growing medium?

Clay pellets, often used as a growing medium in hydroponics or container gardening, have the significant characteristic of retaining moisture well. This property allows them to hold water around the root zone of plants, providing a consistent supply of moisture that is essential for healthy plant growth. They can retain air and moisture due to their porous nature, enabling a good balance of aeration and water retention, crucial for root health.

The other characteristics listed do not apply to clay pellets effectively. While they do have some weight, they are not excessively heavy or difficult to handle in most growing applications, especially compared to some other growing mediums. Additionally, clay pellets are known for their durability and do not break down easily over time, making them a long-lasting option. Moreover, they are neutral in pH, meaning they do not contribute to acidity, which allows for a wide range of plant types to thrive without the concern of altering the pH too drastically. Thus, the ability to retain moisture stands out as their defining and beneficial characteristic.