What are the properties of potting media? Understand them clearly before planting

In recent yearsorchid growingranks have been growing steadily. Orchid-growing methods differ from place to place and country to country, and orchid growers each have their own tricks when it comes to using potting media. There is no need to say more about the various types of potting media, but however they vary, they all come down to the same principle: the potting medium must be absolutely loose and fluffy. A medium that is too hard has excellent air permeability but is not good for orchid root growth, and if it has too many sharp edges and corners it will damage orchid roots. A medium that is too fine tends to become compacted, has poor air permeability and is not good to use. Every type of potting medium must have the property of not becoming compacted after three years of watering. (Song Mingyuan, Anhui)