Why grow in grow bags

Grow bags are made of breathable fabric which means superior drainage and aeration. It is the aeration that makes them superior to other garden containers. If a container has no aeration and the roots reach the walls of the container, they give a signal to the plant to make more roots, resulting in a root bound plant. Eventually the plant just kills itself with a mass of roots going round and round in the container. .

Root bounding will not happen in a grow bag. Here if a root reaches the wall of the bag, it will be “burned” off, causing the plant to constantly produce new and healthy branching roots. This is also called air-pruning. This picture shows nicely how the roots did reach the wall of the bag, but did not go round at all.