PharmaZanswered grow question 6 years ago Yes, water in the morning only if the soil requires it. Stomata is at its widest during low light so having it open when you first water draws up most of the moisture for the day. This is a natural process in nature. It doesn’t need to rain in the morning for this to happen as long as there is moisture in the soil. But it’s better to provide fresh oxyegenated water, which is why in the morning is best. Looking great for a window grow man!!