Prevent rapid evaporation. Foliage burning and rapid evaporation of the water results in poor use of the resources and time of the homeowner. Watering during windy conditions is also not advised as excessive evaporation may take place. Any watering that wets foliage can increase disease damage if the foliage remains wet overnight. If you must use overhead sprinklers, water the garden in the morning or early afternoon so that foliage will dry before nightfall.
Plants vary in their water requirements.
Those with large succulent leaves need more water. Onions do not need as much water as carrots. Potatoes, tomatoes, beans and sweet corn have high water requirements. Plant age is also important. Vegetables that are half grown, but in the midst of vigorous growth, need more water than vegetable plants that are mature.