Water in the morning to give plants a drink at the beginning of the day. Being hydrated helps plants combat the heat of the day & givesfoliage time to dry, which helps prevent diseases. If you can't water in the morning, the next best choice is the evening, once things have begun to cool down. Don't get foliage too wet, especially if your edibles are prone to fungus. At mid-day, water only the BASES of plants that are wilting significantly.
