But watering at the wrong time, or in the wrong way, can actually make plants less resilient during hot weather. Here are five common watering mistakes gardeners make and what to do instead. Watering in the Middle of the DayThe hottest part of the day isn’t the most efficient time to water. Do this instead: Water early in the morning whenever possible. Deep watering, checking the soil before turning on the hose, and watering at the right time of day can keep your garden healthier while using less water.