Creeping Jenny (Lysimachia nummularia) is a perennial prized for its small, coin-shaped leaves. While it typically thrives in moist soil, growing Creeping Jenny exclusively in water is a successful method for both propagation and creating visually appealing indoor displays. Its natural affinity for wet environments makes it an excellent candidate for sustained hydroponic growth, offering a clean, simple way to enjoy its bright foliage.
Preparing Healthy Cuttings
Successful water growth begins with high-quality stem cuttings from a healthy mother plant. Look for vibrant, green stems that show no signs of discoloration or damage. Using clean, sharp scissors or shears, make a precise cut just below a leaf node—the joint where a leaf attaches to the stem.
The ideal stem length for a cutting ranges from four to six inches. After making the cut, strip all leaves from the lower half to two-thirds of the stem. Submerged foliage will quickly rot, polluting the water and potentially introducing pathogens. The bare nodes along the submerged portion of the stem are the points from which new roots will emerge.
Establishing the Water Growing Environment
Once the cuttings are prepared, they need a clean environment to stimulate root formation. A clear container, such as a glass jar or vase, works well, allowing for easy monitoring of water clarity and root development. Fill the container with fresh, room-temperature water. If using tap water, let it sit uncovered for 24 hours to allow chlorine to dissipate before submerging the cuttings.
Carefully place the prepared stems into the container, ensuring only the stripped, leafless portion is submerged below the waterline; the remaining leaves must stay dry and above the rim. Position the vessel in a location that receives bright, indirect light, such as an east or west-facing windowsill. Direct, intense sunlight can cause the water temperature to fluctuate too dramatically or scald the foliage.
Routine Maintenance for Water Grown Creeping Jenny
Sustaining Creeping Jenny in water requires maintenance focused on water purity and nutrient availability. Change the water completely weekly or bi-weekly to replenish oxygen and remove organic matter. During the water change, gently rinse the roots and clean the container to prevent algae buildup, which competes with the plant for resources.
Water-grown plants do not require heavy feeding, but for long-term health, a diluted liquid fertilizer can be introduced sparingly. Use a balanced NPK formulation, such as 10-10-10, at one-quarter to one-half the strength recommended for soil-grown plants, applying it only once a month during the active growing season. As the plant matures, its root system will become dense. Periodically trimming the roots with clean scissors helps manage the size and encourages the growth of fresh, healthy root tips.