All greenhouses require a source of heat during the winter. Greenhouse temperatures vary depending on the types of plants you're growing, with each plant having an optimum temperature and a tolerable temperature in which it can grow.
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Tropical plants require winter temperatures of at least 15.6 degrees Celsius to grow. Most orchids prefer minimum temperatures of 15.6 to 21.1 degrees Celsius. Some vegetable plants and flowers, including cucumbers, require a steady temperature of 23.9 to 26.7 degrees Celsius during the day and nighttime temperatures no lower than 18.3 degrees Celsius.
Temperatures that are lower than optimum may keep the plant growing, but not as fast as if the temperatures are on target. When the temperature drops too low, the plant's growth may stop. Plants may be damaged when temperatures fall outside of the tolerable range.
A dependable source of heat with accurate thermostats remains important in establishing temperature control both in the winter and summer. Heating systems may include space heaters that use fans to distribute the heat. Another option is hot water systems that use piping under the greenhouse benches to deliver heat.
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