Sphagnum moss is a high-quality growing medium for cultivating orchids

Sphagnum moss, also known as peat moss, is a plant of the genus Sphagnum in the family Sphagnaceae, and it mostly grows on rocky cliffs or beside streams and springs in temperate and cold-temperate forests. Fresh sphagnum moss is white-green or bright green, loose and cotton-like, densely interwoven into patches, with stems creeping and appressed, having irregular branches or pinnate branches, and the stems and leaves are nearly the same shape. After cleaning and drying, sphagnum moss is pale white, soft and loose, with high water absorption, capable of absorbing 15 to 20 times its own weight in water, while also having strong water retention and air permeability.

　　The most ideal growing medium for orchids

Orchidaceae plants, especially tropical orchids, are mostly epiphytic orchids with well-developed root systems, requiring a growing medium with good physical stability, excellent looseness and air permeability, and water and fertilizer retention capacity. At first, people did not know that sphagnum moss was the most ideal growing medium for Orchidaceae plants, until Taiwan, China successfully used sphagnum moss as a growing medium for large-scale Phalaenopsis production, and people discovered that sphagnum moss had good results such as high survival rate, fast growth, low cost and environmental friendliness. With the vigorous development of the Phalaenopsis industry in the mainland, and as more and more sphagnum moss was developed and utilized, people began to understand the excellent characteristics of sphagnum moss as a medium, namely that the material is clean and free of pathogens; has good water retention, drainage and air permeability; is not prone to rot and can be used for a long time; and is convenient to use. In addition, sphagnum moss also contains rich organic matter and various nutrient elements such as nitrogen, phosphorus, potassium, calcium, magnesium, sulfur and iron, which can save on fertilizer application. Some orchid growers have tested that growing orchids with sphagnum moss has a 30% to 50% higher shoot emergence rate than using ordinary growing media.

　　How to identify high-quality sphagnum moss

Generally speaking, sphagnum moss growing in shady places or on backlit slopes is pure green, with relatively tender branches and leaves, and the epidermal cells are more easily brittle, with average water absorption, poor air permeability, easy acidification and spoilage, and relatively ordinary quality; that growing under strong light or on sunny slopes is reddish-red, about 8 to 10 cm long, with relatively thick and robust branches and leaves, and good physical stability. Most sphagnum moss sold on the market is packaged in compressed blocks, making it difficult to judge its quality. So, how can you choose good sphagnum moss? You can refer to the following two methods:

　　Method 1: Tap lightly and observe whether there are crumbly residues

High-quality sphagnum moss has a high degree of structural integrity and is regularly compact after compression, without breakage or pulverization. You can hold it in your hand, tilt one corner, and tap the bag lightly to observe whether a lot of crumbly residue falls into the corner of the bag. Sphagnum moss with too many broken bits is of poorer quality.

　　Method 2: Check the packaging

Some domestically produced sphagnum moss uses immature or smaller-sized sphagnum moss, and its physical properties are relatively unstable. By comparison, imported sphagnum moss has relatively stable physical properties and is of relatively higher quality, especially the dried sphagnum moss produced in places such as New Zealand and Chile, which is of better quality. If you need to buy higher-quality sphagnum moss, you can choose some imported sphagnum moss.

　　Correct methods for using sphagnum moss

Sphagnum moss from different producing areas differs in its physical and chemical properties, such as thickness, length and pH, and its use also requires attention. Generally, high-quality sphagnum moss facing the light is suitable for planting small seedlings, while poorer-quality sphagnum moss facing away from the light is suitable for planting medium and large seedlings; thicker sphagnum moss should be planted more firmly, while finer sphagnum moss should be planted more loosely; weaker sphagnum moss is not recommended for use. In addition, it is recommended to soak and wash it thoroughly before use, and to disinfect it if necessary; adhere to a watering method combining moisture and drainage. When planting orchids, watering should be “see dry, see wet,” so that the sphagnum moss is not prone to salt accumulation and acidification, thereby giving full play to ideal fertilizer retention, water retention and air permeability.