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Several methods of orchid fertilization
Homegrown orchids can thrive or struggle, and proper fertilization is one of the most important factors in their care. The climate plays a big role in determining when to start feeding. In southern regions, where it's relatively warmer, you can begin fertilizing after the Spring Festival. However, in northern areas, where the weather is colder, it's better to wait until March or early April, when the temperature starts to rise.
Experienced orchid growers often use well-decomposed dried cow manure mixed with 10 times the volume of potting soil, along with a small amount of phosphate fertilizer, to create a rich base fertilizer. However, city dwellers may find it difficult to obtain mature dry cow dung. In such cases, water-fermented organic materials like bean cake, rapeseed cake, cottonseed cake, or sesame cake can be used as alternatives. These can also be added directly into the potting mix as a base fertilizer, but it's important not to let them come into direct contact with the roots, as this could cause root rot.
During the growing season, liquid fertilizers are also effective. After fermenting the cakes in water, the resulting solution should be diluted 5 to 10 times with clean water and applied every two weeks. A simple and efficient method for beginners is to use a balanced NPK fertilizer with a concentration between 0.025% and 0.1%, which is about 1/3 to 1/4 the strength used for ordinary flowering plants. Additionally, when spraying pesticides, you can add a small amount of chemical fertilizer to the spray solution—it can help improve plant health and growth.
Orchids are very sensitive to over-fertilization, which can easily damage or even kill them. Beginners are advised to use very diluted organic fertilizers to avoid the risk of "burning" the plants. With patience and careful attention, your orchids will reward you with beautiful blooms.