Yes, a Pothos (Epipremnum aureum) can live in water virtually forever. From a botanical perspective, this plant is exceptionally well-adapted to a hydroponic existence due to its resilient nature and specific physiological traits. It will not only survive but can thrive for many years in a water-only environment if its basic needs are met, effectively mirroring its natural ability to grow as an epiphyte on trees where soil is absent.
Pothos plants possess a remarkable capacity to adapt their root systems. When grown in soil, roots develop to absorb water and nutrients from a complex medium. When placed in water, the plant generates a different type of root system—aquatic roots that are specialized for absorbing dissolved oxygen and nutrients directly from the water column. These roots are often lighter in color and less woody than their soil counterparts. The plant's stems and leaves continue to perform photosynthesis as normal, producing the energy required for growth, as long as the root system remains healthy and functional.
For a Pothos to live indefinitely in water, several conditions must be consistently maintained. The plant cannot subsist on water alone indefinitely; it requires supplemental nutrition. A balanced, water-soluble liquid fertilizer, diluted to about a quarter of the recommended strength, should be added monthly during the growing season. This provides the essential macro and micronutrients (like nitrogen, phosphorus, and potassium) that would naturally be found in soil.
Root respiration is a critical process. Roots need oxygen to create energy; without it, they will rot, killing the plant. Stagnant water becomes deoxygenated. To prevent this, the water must be changed every one to two weeks. This refreshes the oxygen supply in the water and prevents the buildup of harmful bacteria and algae that thrive on waste products and can cause root disease. Using room-temperature tap water that has been left out for 24 hours allows chlorine to evaporate, preventing chemical burn on the roots.
As with any plant, light is the engine of growth. A Pothos in water requires bright, indirect light to fuel photosynthesis and maintain vigorous growth. Direct sunlight should be avoided as it can heat the water excessively, promoting algal growth and potentially "cooking" the roots. The plant also prefers consistent room temperatures between 65°F and 85°F (18°C - 29°C), avoiding cold drafts or direct heat sources which can cause stress.
The choice of container plays a role. An opaque or dark-colored glass container is preferable as it blocks light, significantly inhibiting algal growth. When changing the water, it is good practice to gently rinse the roots to remove any slippery film. Periodically, you should trim any roots that have turned brown, black, or mushy—a sign of rot—using sterile shears. Healthy roots are firm and range in color from white to tan to green.
