In some cases it is a good idea to make wire frames to go over doors or ventilators to keep out birds or domestic pets, and sometimes small children. All can do much damage in a few minutes. Much depends on individual circumstances and the greenhouse situation as to whether it is worth going to the trouble.
Gutters can be had to fit most greenhouses, or the ordinary domestic plastic guttering can be fitted if necessary. Guttering is useful to lead away water and prevent excessive saturation of the greenhouse floor due to see in winter. It also prevents mud splashing on glass-to-ground greenhouses. Unfortunately many people think that the collected rainwater should be used for their greenhouse plants. In fact, to do this is to invite disaster. Rainwater collected from a roof is likely to contain weed seeds, and innumerable pests and diseases. Often the matter is made worse by storage in open butts in which dead leaves and filth accumulates, all adding to the pest and disease build· up. don’t, then, use such water for irrigation in your greenhouse. There is no point in using carefully prepared and sterilised compost if you do.
When a greenhouse is sited some distance from the dwelling house it is often useful to fit a weather vane. This greatly helps in selecting the best ventilators to open for ventilation, seeing which is the lee-side and noticing changes in wind direction. In some areas wind rushing through a greenhouse can create devastation, and in gales can even damage the structure if vents are opened directly facing the tempest. Modern weather vanes are now available in aluminium alloy in many attractive designs that may enhance the appearance of a greenhouse.