Sufficient water is a crucial ingredient to a bountiful garden harvest.
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.
Water slowly. Spraying a full blast on a garden is more likely to wash away the dirt than provide the plants with enough water. Take it easy, and let the water fall gently on the soil and plants. Water consistently. Plants do best when they’re on a regular schedule rather than a seesaw approach of overwatering followed by drought-like conditions.
No Irrigation System Needed -- Here's how I water my vegetable garden -- a flat soaker hose. There are tiny holes along the hose. Just run the hose up and down and around your rows and plantings, or around the entire bed, and turn the water on. Give the plants a good soaking. They are available at any garden, home or hardware store.