Phalaenopsis cultivation and management methods and technical key points

1. Growing medium: When planting, place growing medium at the bottom of the pot, at least 1/2 of the pot volume. For the medium, sphagnum moss (suitable for small and medium seedlings), all tree-fern fiber, a mix of tree-fern fiber and sphagnum moss, or a half-and-half mix of tree-fern fiber and charcoal granules works very well. Others such as vermiculite, peat soil, tree-fern roots, and coconut husk chips can also be used as growing medium.

2. Watering: Phalaenopsis is native to primeval forests with relatively high humidity. It also has no thick pseudobulbs to store nutrients and water. Therefore, Phalaenopsis should be cultivated and cared for in a ventilated, high-humidity environment. The optimum humidity during the day is 70%; humidity at night can be slightly lower, especially when flowering. Water more during the peak growth period and less during the dormant period after flowering. In spring and autumn, water once a day around five in the afternoon; in summer, when the plant grows vigorously, water once each at nine in the morning and five in the afternoon; in winter, when light is weak and temperatures are low, watering once every other week is sufficient, and it is best done before ten in the morning. If a cold wave arrives, do not water; keep the plant dry, and resume watering after the cold wave has passed.

3. Light: Phalaenopsis requires less light than most orchids. For outdoor cultivation, the required light intensity is about 40% of full sun, and direct strong light must be avoided. Shading can be adjusted according to the intensity of sunlight in different seasons: 80% shading in summer, 60% shading in autumn, and 40% shading in winter. The shading method is to use shade netting with a suitable shading rate. Using wooden slats or bamboo strips also works very well. In places where the annual average light is relatively low, shading can be reduced as appropriate. For indoor cultivation, light with an intensity of 600-1000 foot-candles is sufficient.

4. Temperature: The optimum growing temperature for Phalaenopsis is 20-30°C, with the night temperature kept above 18°C and the daytime temperature around 26°C. In summer it must not exceed 35°C, and in winter it must not fall below 10°C; otherwise growth is inhibited. Flower bud differentiation requires temperatures below 18°C; after differentiation, raise the temperature to between 20-25°C to induce rapid growth of the flower spike.

5. Fertilization: Before flowering, mainly use nitrogen fertilizer, applying decomposed soybean cake water at a concentration of 20%, once every two weeks. As flowering approaches, mainly use phosphorus and potassium fertilizer, applying decomposed chicken and duck manure liquid fertilizer at a concentration of 20%, once every ten days. During the growing period, a prepared dilute mixed fertilizer of nitrogen, phosphorus, and potassium can also be used, sprayed on the leaves in an appropriate amount once a week. Fertilize after watering in the afternoon. After several applications, flush the orchid pot and plant thoroughly with plenty of clean water to prevent residual inorganic salts from harming the roots.