Water apple green are available in the summer. Water apple green are very low in calories because of their high water content—91.6%! They have some fiber, calcium, magnesium, potassium, and Vitamin C, but little protein or fat. The immature fruit’s skin is green and glossy, ripening to red. Water apple green are considered to be good for quenching thirst, because of their high water content. Water apple green grow in tropical climates at low altitudes.