Posted: 09/05/2014 at 23:49
Hi, i have my auto vents adjusted to open as soon as it gets around 18C, i like to have good airflow to reduce the chance of disease. i grow tomatoes & cucumbers last year but the tomatoes did a lot better than the cucumbers/melons.
Its up to you if you want to cater more towards the tomatoes or the cucumbers. you can make the GH more humid by wetting the floor.
Position for roof vents depend on you, i think one on either side of the roof would provide better airflow. Is your GH sheltered from the winds? the wind can snatch it and rip it off. i had that problem today, it was warm enough in the GH so the vents started to open yet it was really windy outside.