All aquatic plants have the exact requirements for nutrients, sunlight, humidity, CO2 and oxygen levels, and any other circumstances that may play a role in sustaining their health over time. It would be best if you met these criteria for the plants to remain healthy. Today, we will discuss whether aquatic plants require oxygen and the quantity of oxygen that these plants need. To respond to your inquiry in a way that is uncomplicated and straightforward: yes, plants that grow in water do require oxygen to survive.