By controlling the light, temperature and relative humidity inside greenhouses the optimal conditions for growth can be met and a self-contained ecosystem created. These greenhouse ecosystems can be enjoyed by hobby gardeners or by large plant producers.
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The leaves of plants need to absorb light for the photosynthesis process. Depending on the plants in the greenhouse, different lighting conditions will be needed. Most potted plants that flower and most vegetables need highlight requirements to grow. Plants needing lower light include most foliage plants and some potted flowering plants.
The optimum temperature for specific plants differs. However, the Alabama Cooperative Extension System says general temperatures for tropical or subtropical plants will be no lower than 15.6 to 18.3 degrees Celsius at night. Cool season plants can thrive at lower temperatures. Ideal day temperatures should not exceed night temperatures by 10 to 15 degrees on sunny days or 5 to 10 degrees F on cloudy days.
According to Mother Earth News, relative humidity, the amount of water in the air, should range from 55 per cent to 60 per cent. Most plant growth thrives within this range. If the relative humidity is lower than 55 per cent, plants may grow slower and will need more frequent watering. With the relative humidity higher than 60 per cent plants run the risk of contracting fungal diseases.
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