Cucumbers thrive in warm conditions and have some cold resistance, but they require a certain temperature difference between day and night for optimal growth. The ideal fertility temperature range is 18-30°C, with the most suitable temperature being around 24°C. Through gradual low-temperature acclimation, cucumbers can tolerate short-term exposure to as low as 1°C, but this can lead to frost damage. When temperatures drop below 10°C, growth becomes stunted or abnormal. On the other end, temperatures above 45°C cause wilting, and when it exceeds 32°C, respiration increases, leading to poor growth. At over 35°C, plant development slows significantly, and above 40°C, plants may die.
During the growing season, maintaining a temperature difference between day and night is crucial. Ideally, daytime temperatures should be between 25-30°C, while nighttime temperatures in the middle of the night should be around 18-20°C, and in the later part of the night, 12-15°C. This creates a temperature difference of approximately 10°C. The cooler nighttime temperatures help reduce plant respiration, improve the transport of nutrients, prevent leggy growth, and ultimately increase yield.
For seed germination, the minimum temperature required is 12.7°C, with a maximum of 38°C. The ideal germination temperature is 28-32°C. Below 18°C, the growth rate slows down, and above 35°C, the germination rate declines. Seedlings should not be exposed to temperatures below 13°C or above 33°C. For root development, the ideal temperature range is 20-22°C, with a minimum of 12°C and a maximum of 38°C. Above 32°C, root respiration increases, which can be detrimental. Therefore, transplanting cucumber seedlings in early spring should occur only after the temperature stabilizes above 12°C to ensure healthy growth.
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