It is a common method to use volcanic stone to grow dendrobium, but of course, volcanic stone is generally added to bark, coconut coir and other materials to mix into planting materials.
Volcanic stone is also called pumice or porous basalt, which is a very precious porous stone formed by volcanic glass, minerals and bubbles after the volcanic eruption. Volcanic stone is characterized by its light weight, loose porosity, good permeability and rich in macronutrients such as silicon, aluminum, iron, potassium, sodium, calcium, magnesium, manganese, phosphorus and many other trace elements.
The unique porosity, air permeability and water permeability of volcanic stone are suitable for growing orchids and succulents, which require high air permeability, and can be used as planting substrate and bottom drainage layer. Volcanic stone can be used as a substrate for soilless cultivation, green roofs, and indoor potted planting material. When used alone, it can be supplemented with nitrogen, phosphorus and potassium in time to make flowers grow normally, but it can also be mixed with various kinds of vermiculite, coconut coir, peat, bark, etc., which is a good planting material for gardening.
Volcanic stone is very porous, it has the characteristics of water retention and air permeability of granular soil, while the texture is hard, harder than terracotta, no short-term chalking troubles, no problems with bacteria and insect eggs, volcanic stone itself with trace elements, can provide the necessary nutrients for flowers, can make flowers grow more vigorously, but when choosing volcanic stone need to pay attention to, do not choose the volcanic stone with excessive sulfur content However, when choosing volcanic rocks, you should be careful not to choose those with too much sulfur, as sulfide reacts with water to form acid, which can easily cause root burning.
Volcanic stone can insulate and absorb excess water, promote the growth of flowers in a suitable environment, keep the soil loose, and play a regulatory role in soil growth conditions. It can also reduce pests and bacterial contamination, especially the voids of volcanic rocks have many effects on the roots of flowers, which can fix the roots of flowers and reduce the occurrence of root rot disease.