Uses limited heat to keep the structure above freezing. Useful for overwintering some tender plants, but not the same as warm growing conditions.
HEATED GREENHOUSE OPTIONS
Heat for the plants you intend to keep.
Heating can prevent frost, maintain a cool greenhouse or support tropical plants. Each step upward in minimum temperature increases cost and changes the plants you can grow.
Choose a temperature category first
Maintains a modest minimum suitable for a broader range including many tender ornamentals and citrus, subject to each plant’s needs.
Supports plants needing consistently higher temperatures. Insulation, humidity, light and backup planning become essential.
Heat evenly and measure at plant level
Use a thermostatically controlled heater designed for greenhouse conditions. Place temperature sensors among the plants rather than close to the heater or glazing. Circulating air gently reduces hot and cold pockets, but avoid a harsh draught over foliage.
Insulation without suffocation
Clean glazing first, then use suitable greenhouse insulation while keeping vents operable. Seal obvious gaps but retain controlled ventilation: warm, stagnant air can still encourage disease. Avoid unsafe improvised heaters and follow the equipment manufacturer’s electrical or fuel-safety instructions.
Plan for failure
A cold night, power cut or empty fuel supply can damage a valuable collection quickly. Use maximum–minimum alarms where justified, keep frost fleece available and decide in advance which plants could be moved indoors.
Explore the plant directory and monthly growing calendar.
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Keep growing your knowledge.
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