Watering in Greenhouses / Tunnels
Unlike outdoors, keeping plants grown under cover supplied with sufficient moisture to meet their needs can often be a daunting task, particularly in very hot weather, when they may need to be watered more than once per day.
Luckily there are a number of things that can be done to make this task easier.
Placing pots on capillary matting set in shallow trays part filled with water allows the plants to absorb water when they need it.
Placing a bottomless carton or plant pot at the base of each plant at planting out time ensures the water gets down to where it is most needed.
Idealy these containers want to be 0.5 -1 litre in size.
Good shading and ventilation will also reduce rates of evaporation.
Investing in an automatic drip system with a built-in reservoir, should take care of most of the necessary plant irrigation required, particularly at holiday time, this particularly suited to potted plants.
Both of these could be connected to a water timer to give even more control.
Planting out at wider spacing can reduce the need for water, the closer plants are the more water they need.