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Plant Care Guide > Choy sum > Temperature
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Ideal Temperature Range for Choy sum
(Brassica rapa var. parachinensis)
Choy sum, also known as Choy sum
Choy sum thrives in a warm environment, favoring temperatures between 68 to 95 °F (20 to 35 °C). To maximize growth, maintain this range and adjust protection against cooler or hotter extremes according to seasonal shifts.
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What Is the Ideal Temperature Range for Choy sum?

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Ideal
Tolerable
Unsuitable
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Lovingly monitor the temperature around your plants and adjust their environment as needed. A thermometer can be your ally in this heartfelt endeavor.

Temperature Essentials for Choy sum

essentials
Regional wintering strategies
Choy sum prefers relatively warm temperatures, so maintaining temperatures above 20°C during winter cultivation is beneficial for plant growth. The minimum temperature should be kept above freezing point to prevent the plant from freezing damage. When the outdoor temperature approaches -5°C (25°F) during winter, it is advisable to bring Choy sum indoors or provide protection by setting up a temporary greenhouse or using materials such as plastic film or fabric to wrap the plant.
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Signs of Low and High Temperature in Choy sum

Symptoms of Low Temperature in Choy sum
Choy sum has moderate tolerance to low temperatures and thrives best when the temperature is between 20°C and 35°C. During winter, it should be kept above 0°C. When the temperature falls below -25°C, the leaves may darken in color. In severe cases, water-soaked necrosis, wilting, and drooping may occur, and the color of the leaves gradually turns brown.
Solutions for Low Temperature in Choy sum
Trim away the frost-damaged parts. Immediately move indoors to a warm environment or set up a makeshift greenhouse for cold protection. When placing the plant indoors, choose a location near a south-facing window to ensure ample sunlight. If there is insufficient light, you can use supplemental lighting.
Symptoms of High Temperature in Choy sum
During summer, Choy sum should be kept below 35°C. When the temperature exceeds 38°C, the plant's growth slows down, the color of its leaves becomes lighter, and it becomes more susceptible to sunburn.
Solutions for High Temperature in Choy sum
Trim away the sunburned and dried-up parts. Move the plant to a location that provides shade from the afternoon sun. Water the plant in the morning and evening to keep the soil moist.
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