Greenhouse managers recommend to keep temperatures above 10 degrees C minimum at night, unless you have delicate tropical plants, which shouldn't be exposed to temperatures below 15.6 degrees C. Day temperatures, should be -15.0 to -12.2 degrees C higher on cloudy days and -9.44 degrees C higher on sunny days.
Do not respond to ambient temperature in the same way at each stage of growth. Germination requires warmer temperatures, while later states may require cooler temperatures. Different types of plants like different temperatures. Tropical plants need warmer temperatures. Cooler-climate plants may not grow in damp tropical heat.
Adjust the temperature of your greenhouse to suit the plant, its stage of growth and its preference for sunshine by using fans, misters, shade screens, heaters and solar collectors. Solutions may be as simple as opening the windows, or turning on the fans for an hour a day.
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