Charcoal and coconut shell

Big charcoal has the effect of comprehensive acidity, and it can also absorb water and stabilize the humidity. Langen likes to attach to it. Large pieces can be used to pad the bottom of the basin, and broken can be mixed with plant materials. Coconut shell has three specifications: thick, medium and fine, suitable for large, medium, small seedlings and bottle seedlings, water retention, drainage, ventilation are good, can be used alone or mixed with other plant materials. (Xue Congxian)