Experts and BHG readers answer.
best time of the day to water
It's best to water in the morning. If you water in the middle of the day, much more of the water you apply evaporates, so it's wasteful. If you water in the evening, the plant's foliage may stay wet throughout the night and that creates an ideal environment for disease. So morning is best. Most of your flowers and vegetables will thrive on one inch of water per week. (Melons will use more water than that.) It's best to water deeply and infrequently rather than shallowly every day, so use a sprinkler rather than a watering wand. Set a rain guage out to measure how much water your sprinkler puts on the garden. If possible, water deeply with a sprinkler just once a week. Sometimes during the worst of summer's heat, you may end up watering twice a week. Mulch can help retain soil moisture.