Summer brings rising temperatures and increased humidity, creating ideal conditions for all types of orchids to thrive. During this season, it's crucial to focus on several key aspects to ensure healthy growth and prevent damage.
First, shading is essential. Orchids prefer a cool and well-ventilated environment. As summer progresses, sunlight becomes stronger, especially in the north, where orchids are often moved out of greenhouses. They can be placed under shaded trees or near bamboo groves, or in shade houses with indirect light. To encourage bud development, allow them to receive one hour of gentle morning or evening sunlight. In late summer, increase shading to protect against heat, and water frequently in the morning, afternoon, and evening while ensuring good air circulation.
Second, pest control and sterilization are important. In southern China, summer is hot and rainy, which creates a perfect breeding ground for pests and diseases. To keep potted orchids healthy, spray pesticides around the growing area every seven days to prevent infestations.
Third, watering must be carefully managed. Orchids that are planted in materials like red clay bricks, volcanic rock, or eucalyptus soil may need water once or twice daily. However, if using moisture-retentive materials such as pond mud, compost soil, or peat, watering every two to three days is sufficient, provided you mist the leaves regularly in the morning, afternoon, and evening. The goal is to maintain a balance between dry and moist conditions to meet their growth needs.
Watering should ideally take place before sunrise and after the day’s heat has subsided. Issues like root rot, leaf spots, and bud decay are often linked to improper watering practices.
Fourth, fertilization requires caution. Use balanced NPK fertilizers for green leaf varieties, and only phosphorus and potassium for blooming types. All organic fertilizers must be fully fermented and diluted with clean water. Apply liquid fertilizer every 10 days from early spring to mid-summer, preferably on sunny days. After fertilizing, flush the pot with clean water within the first hour or the next morning to avoid root burn. Avoid fertilizing new growths, diseased plants, or weak, old orchids. Also, stop fertilizing when temperatures exceed 30°C, and avoid doing so on rainy days or during flowering periods.
By following these care tips, your orchids will have the best chance to flourish throughout the summer months.
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