Can orchids be grown on coal slag?

Can orchids be grown on coal slag?

Orchids can be grown on coal slag. Coal slag is the residue left after coal is burned. Coal slag is generally granular or irregular blocky, so when used to grow orchids, it can increase the air permeability of the soil and is more convenient for drainage. The nutrients it contains can also provide nutrients for orchids.

Advantages and disadvantages of growing orchids on cinders

Advantages: The particles of coal slag are of different sizes, so when used, it can improve the water and fertilizer retention capabilities of orchid soil. Such soil will not become compacted and will not contain pathogens. The phosphorus and potassium elements contained in it can also promote the growth of orchid roots and leaves.

Disadvantages: The air permeability and drainage of coal slag are relatively good, which will cause the soil's water absorption to become relatively poor. In addition, if the alkaline substances contained in the coal slag are not cleaned up, the soil will become compacted and the roots will be burned.

How to grow orchids with coal slag

1. Soaking: Coal slag contains a lot of alkaline substances and some sulfur elements, so you need to soak it in water several times when using it, and then select coal slag about 1 mm in size.

2. Soil preparation: The processed coal slag can be mixed with soil as a planting medium for orchids, or it can be placed at the bottom of the flowerpot or on the surface of the soil.