All vegetables, like humans, require water to function and grow. Water is an essential element for plants to absorb nutrients, it is vital in the manufacture of food. Water is constantly lost through the process of transpiration, from the surface of the leaves. When the amount of water lost through transpiration is more than which is absorbed by the roots, the plants begin to wilt and whither, resulting in poor health for the crops and highly reduced yields. Water is also lost from the soil as it evaporates and warmer weather may cause a loss of up to 4.5 litres per square meter. However, you have to be careful not to overwater, as this may result in reduced soil aeration affecting root and shoot growth. It could also affect flavour adversely.
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