Carbon dioxide

In cold weather, with no ventilation, a minimum carbon dioxide concentration of 1000 vpm (~1000ppm) is recommended during the day. In the summer, with ventilation, the application of supplemental carbon dioxide at a concentration up to 400 ppm has been found economically useful in other countries, but this technique is too new in Canada to support definite recommendation. Regions with a moderate (sea) climate, such as British Columbia, are more likely to benefit from carbon dioxide applied in the summer. But in regions with a continental climate, such as southwestern Ontario, the need to ventilate the greenhouse actively throughout the hot summer probably renders the practice uneconomical.

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