Cucumbers are among the oldest cultivated vegetables. Similar to tomatoes, they cannot tolerate rain, as the leaves rapidly become sick and the fruit can rot. Nevertheless, they regularly need a lot of water because they only have a shallow root system. Despite the temperature requirement, outdoor growing of cucumbers in particular for preserving cucumbers has proved successful in favourable locations. However, these are concentrated around the processing companies for preserved foods which are thus climate limited.
Salad cucumbers are produced almost exclusively in protected cultivation under foil or glass. The yields are more than twice as high as in open field cultivation. Cucumbers are susceptible to mildew and viruses like all plants in the pumpkin family. Varieties with resistance and/or tolerance to individual diseases are advantageous.