Artificial media and potting mixes Used in greenhouse potted plant and container nursery production. Add weight and large pore space to pots. Most artificial mixes that have a lot of peat moss are very hard to get wet if they become very dry. Wetting agents are added to help spread water throughout the pot. Compaction occurs when media is packed into the pot.
Roots develop poorly because of poor air and water-holding characteristics.
Depth of pot determines how well a pot drains. Taller pots drain better than shallow pots.