How much water do plants transpire?
Plant transpiration is pretty much an invisible process—since the water is evaporating from the leaf surfaces, you don’t just go out and see the leaves “sweating”. Just because you can’t see the water doesn’t mean it is not being put into the air, though. During a growing season, a leaf will transpire many times more water than its own weight. An acre of corn gives off about 3,000-4,000 gallons (11,400-15,100 liters) of water each day, and a large oak tree can transpire 40,000 gallons (151,000 liters) per year.
