The best time of day to water your vegetable plants is early in the morning. This is because of two main reasons.
The first is that watering your plants early in the morning before the sun becomes very strong, will allow the water to move down as deep as possible and soak into the soil without getting evaporated. This is a way of using water as efficiently as possible.
The second reason is that watering your plants before the sun comes out and early in the day will help your plant roots completely dry up by evening. When plant roots remain damp overnight, it creates an ideal breathing ground for plant pathogens that cause diseases.
Not everyone has a schedule that will provide them with enough time to water all their plants in the morning, but there are a couple of steps you can take to make watering your plants early in the morning possible.
Despite all your efforts, if you are still unable to water your vegetable plants early in the morning, the next best time is in the afternoon, as the sun is starting to go down. This is the next best time because evaporation will again be lower and the soil will still have some time to get dry before the day turns into night and gets darker and colder.
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