Water is generally known to consist of two molecules, hydrogen and oxygen, what then do we mean by dissolved oxygen. Well, dissolved oxygen refers to the molecular oxygen saturation in water and it has been proven to be immensely beneficial to plant growth and in the development of massive and healthier cannabis plants. Molecular oxygen finds its way into water from different sources when air traps oxygen into them and when such waters are used to irrigate plantations, they play a major role in growth and development.