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Foliage (or leaves) are the means by which vascular plants transpire (release moisture into the atmosphere and cool itself) and photosynthesize (convert light energy or sunlight into chemical energy or carbohydrates.)
Transpiration is important to plants and to people who benefit from them. On a hot day, a large tree can transpire up to 100 gallons of water each day.
Foliage can also be the conduit for transferring baceteria and herbicides into a plant\'s vascular system.