Check greenhouse ventillation
ON SUNNY DAYS the greenhouse can heat up so much that the difference between day and night temperatures can affect plant growth. Lowering the day temperatures with ventilation will help keep levels consistent. Open vents on the sides and in the roof a little so that air is drawn through the greenhouse. This airflow reduces fungal disease but will increase the plants’ demand for water. Don’t forget to close the vents again in the afternoon to protect plants from the low night temperatures.