This month marks the transition between summer and autumn, with two important seasonal divisions: *Liqiu* (around the 7th or 8th) and *Shuishi* (around the 23rd or 24th). The average temperature remains similar to the previous month, hovering around 29°C. It's still one of the hottest months of the year, so maintaining shade is crucial. When temperatures stay below 28°C, it's safe to use curtains or shades to protect orchids from direct sunlight. For indoor orchids, ensure good ventilation and cooling to avoid overheating.
As the season shifts, air humidity decreases, making watering more critical. Increase your watering frequency and be mindful of the ancient wisdom that warns about the dryness of autumn. If there's a prolonged drought, make sure to keep the environment moist. If humidity drops too low, consider misting the area to maintain proper moisture levels. This helps prevent the leaves from becoming brittle and supports healthy growth.
With the heat of summer subsiding, orchids have used up a lot of nutrients in their pots. It’s time to start applying organic fertilizer mid to late this month. Apply once every ten days, but always dilute the solution properly after sterilization. Alternate between different types of fertilizers for balanced nutrition. This month, increase phosphorus and potassium to encourage bud formation and support the growth of new shoots and early spring buds. However, avoid over-fertilizing—apply only when the growing medium is slightly dry, and do it in the evening when temperatures drop below 30°C. Water the orchids the next morning to help them recover.
A typhoon may hit this month, so it's essential to secure your orchid containers and protect them from strong winds. After the storm, check the shading structures and repair any damage to prevent sunburn on the plants. Typhoon aftermath often brings hot and windy conditions, so timely maintenance is key.
Insect activity is high this month, so pest control becomes a priority. Use appropriate insecticides—such as omethoate for scale insects and diclofen for red spider mites. Avoid using carbofuran, which can be harmful. Reduce light at night, as it attracts moths and other pests that may damage the orchids. This is also a high-risk period for diseases like soft rot and stem rot, so regular sterilization is necessary. Use antibiotics like streptomycin, fungicides like chlorothalonil, and systemic fungicides like thiophanate-methyl. Don’t just spray the leaves—treat the entire growing area. Perform these treatments in the evening when the sun is setting.
Autumn sunlight helps strengthen the orchid’s structure, improves its resistance to pests and diseases, and enhances cold tolerance. After *Liqiu*, gradually expose the orchids to more sunlight, but avoid intense afternoon heat. Once temperatures drop below 28°C, you can begin removing the shade cloth earlier in the day.
This month is also the peak blooming period for Jianlan. After flowering, promptly remove the spent blooms to encourage nutrient absorption and promote stronger growth. Trim damaged or diseased leaves to prevent the spread of infection. Remove any dead or burnt leaf tips to keep the orchids looking neat and healthy.
Lastly, avoid repotting, dividing, or introducing new orchids this month. The current conditions make it risky—newly divided plants are more susceptible to disease, and older ones may struggle to establish themselves. Wait until the weather stabilizes before performing any major orchid care tasks.
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