Q: What is green roof growing media?

A: Green roof growing media can be defined as an engineered soil that both mimics and improves on the properties of natural soil. Native soil is the product of a natural process that has occurred over thousands of years. Although native soil works perfectly in its natural environment, it cannot be used on green roofs due to its excessive weights, its inability to retain sufficient amounts of moisture, as well as its inability to drain excessive amounts of moisture properly.

On the other hand, green roof growing media faces several additional requirements since it ultimately must promote plant life in an environment which is very different from the natural surroundings of these plants.

In short, an ideal growing medium should support plant growth, be lightweight, and should retain and drain water simultaneously. It also must perform all of these functions in an extremely shallow system.

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