Another key to better growth with Smart Pot® is heat release. Plastic containers trap and hold heat. The Smart Pot® is made of fabric that releases heat and aerates the root zone. Aeration allows evaporative cooling to occur in the container, extending the growth cycle. Do this simple test – place a temperature gage in your plastic pots on a sunny afternoon. Too hot for root growth! Now remove the plastic pot and find the “hot side of the pot”, the area that faced the sun. No root growth here. With the fabric Smart Pot, heat is released, the full container area is utilized, and better growth is the result.