The Pothos plant (Epipremnum aureum) is a popular and resilient houseplant known for its heart-shaped leaves and trailing vines. While most plants require soil, Pothos is exceptionally adaptable and can thrive long-term in various growing conditions, including water alone. Although traditionally cultivated in potting mix, this species’ flexibility allows it to be maintained in an aquatic environment.
The Role of Potting Mix
The purpose of a potting mix is to provide a comprehensive support system for the plant’s root structure. A good soil blend offers essential anchorage, allowing the plant to establish a firm base for its vining growth. Beyond physical support, the mix is the primary mechanism for moisture regulation, retaining water while allowing excess to drain away.
A quality soil mixture must ensure proper aeration, delivering oxygen directly to the roots. Without adequate oxygen, the roots cannot effectively absorb nutrients, leading to decline. The ideal blend for Pothos is a well-draining, slightly acidic mix, often achieved by combining standard potting soil with materials like perlite or orchid bark to enhance porosity. This setup allows the plant to access organic matter and minerals necessary for steady and vigorous growth.
Thriving in Water Alone
Pothos can successfully live in water long-term because it naturally grows on other surfaces in its native habitat. This allows the plant to develop specialized aquatic roots, which are morphologically different from soil roots. These “water roots” are thinner and more efficient at extracting the dissolved oxygen present in the water.
To start a Pothos in water, a cutting with at least one node—the small bump on the stem where a leaf emerges—must be placed in a clean vessel. Ensure the node is submerged while keeping all leaves above the water line to prevent them from rotting. The cutting should be situated in a location that receives bright, indirect light, which fuels root development. New roots typically begin to emerge from the submerged node within two to four weeks.
Practical Care Adjustments
Growing Pothos in water requires a different maintenance routine than growing it in soil, primarily concerning nutrient delivery and water cleanliness. Since water does not naturally contain the wide spectrum of micronutrients found in soil, plants grown aquatically rely entirely on manual fertilization. A diluted, water-soluble liquid fertilizer, often applied at one-quarter strength, must be added to the water every four to six weeks during the active growing season.
Water quality is another significant factor that must be actively managed to prevent stagnation and the buildup of mineral deposits. The water should be changed completely every one to two weeks to replenish dissolved oxygen and remove any waste byproducts released by the roots. Allowing tap water to sit uncovered for 24 hours before use can help the chlorine dissipate, which reduces the potential for chemical damage to the delicate water roots.