Yes, you can absolutely grow a Peace Lily (Spathiphyllum) in water. This method, a form of hydroponics, leverages the plant's natural adaptability. From a botanical perspective, a Peace Lily is not a true aquatic plant, but it possesses robust and versatile root systems that can absorb oxygen and nutrients directly from water, provided certain conditions are met to mimic its natural tropical forest floor habitat.
Peace Lilies are terrestrial plants with fibrous root systems. In soil, these roots anchor the plant and absorb water and dissolved minerals from the spaces between soil particles. The key to hydroponic success lies in the root's ability to respire. Roots need oxygen for cellular respiration to generate energy. In waterlogged soil, they suffocate and rot, but in a well-maintained water culture, the system is designed for gas exchange. The parts of the roots above the waterline and those suspended in the oxygenated water can absorb the necessary oxygen, allowing the plant to metabolize and thrive.
Transitioning a soil-grown Peace Lily to a water environment must be done carefully to avoid shock. First, gently remove the plant from its pot and thoroughly rinse the root ball under lukewarm water until all soil particles are washed away. This is critical, as leftover soil can decompose in the water, fostering harmful bacteria and fungi. You may notice two types of roots: thicker, white roots and finer, hair-like roots. It is normal for some of the finer roots to be damaged during this process. Before placing it in its water vessel, you can trim any roots that are black, slimy, or visibly rotten.
Simply using tap water is insufficient for long-term growth. The plant will initially live off nutrients stored in its roots, but these will deplete. For sustained health, you must provide a hydroponic nutrient solution. Use a balanced, water-soluble fertilizer diluted to a quarter or half strength to prevent root burn. The choice of vessel is also important. Use a container, such as a vase or jar, that allows you to submerge only the roots, keeping the base of the stems and all the leaves completely above water. This prevents crown rot. Furthermore, using an opaque container or keeping it in a place away from direct light will inhibit algae growth, which competes with your plant for nutrients and oxygen.
To keep your hydroponic Peace Lily healthy, consistent maintenance is required. You should change the water completely every two to four weeks. This refreshes the oxygen content in the water, flushes out any accumulated waste compounds from the roots, and replenishes the nutrients. When you change the water, take the opportunity to rinse the roots gently and clean the inside of the vessel to remove any algal film. Always use room-temperature water to avoid shocking the plant's root system. With proper care, your Peace Lily will continue to grow its root system and foliage and can even produce its iconic white blooms, signaling its contentment with its aquatic home.
