In Guangdong, even though autumn has officially begun, daytime temperatures can still reach around 32°C. For Phalaenopsis orchids, care should still follow summer standards.
Many growers worry that orchids might “get cooked” under such high heat and therefore avoid repotting during this period. However, my experience proves otherwise: hot weather is actually the best time to repot.
From a scientific perspective, high temperatures are not harmful to Phalaenopsis—in fact, they are beneficial. Warmth boosts vegetative growth and metabolism, speeding up nutrient absorption and repair. Just as the human body circulates blood more actively in warm conditions, orchids also thrive in such an environment.
In my own cultivation, the orchids on my south-facing balcony endure summer highs of 38°C or more, yet they not only survive but flourish. Each year, new roots sprout vigorously, with fresh crystal tips appearing in abundance. After repotting, they establish themselves surprisingly quickly—sometimes within days, new roots start anchoring into the growing medium.
Another advantage of high temperatures is that orchids adapt more easily to new conditions. With their “energy switch” turned on, roots grow strongly, anchoring the plant and building reserves. These new roots act like little warehouses, storing nutrients so that when the flowering season arrives, the plant can bloom profusely.
In conclusion: Don’t be misled by the old belief that orchids shouldn’t be repotted in hot weather. Temperature itself isn’t the problem—the real risk is direct scorching sunlight. As long as you shield them from harsh sun exposure, summer and early autumn are excellent times for repotting Phalaenopsis orchids.
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