Quick Answer
Growing tropical plants in cold climate greenhouses poses challenges such as maintaining optimal temperature, humidity, and light conditions. This can be achieved through insulation, heating systems, and climate control, but it often requires significant energy and resource investment. The plants' specific needs must also be carefully considered.
Challenges of Temperature Control
Maintaining an optimal temperature range between 65-90°F (18-32°C) for tropical plants is crucial. In cold climate greenhouses, this can be achieved through insulation, such as double glazing or bubble wrap, and heating systems like radiant floor heating or propane space heaters. For example, a 10x10 ft greenhouse can be heated with a 30,000 BTU propane heater, providing 65-70°F (18-21°C) temperatures on a 0°F (-18°C) outside day.
Addressing Humidity and Light Needs
Tropical plants also require high humidity and specific light conditions. To achieve this, incorporate a misting system that can maintain above 50% humidity levels, and consider using LED grow lights that provide the necessary spectrum and intensity for the plants. For instance, using a 12-hour photoperiod with 20,000 lumens/m² LED grow lights can support tropical plants like orchids or bromeliads.
Off-Grid Power Considerations
When powering a cold climate greenhouse with off-grid energy sources, such as solar panels or wind turbines, it’s essential to consider the energy demand of heating and climate control systems. For example, a 2 kW solar panel array can provide 4-6 hours of electricity on a sunny day, which may not be sufficient to power a 30,000 BTU heater for an extended period. This requires careful planning and energy storage system design to ensure consistent power availability.
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