The Philodendron ‘Pink Princess’ is a popular houseplant celebrated for its distinctive pink variegation against dark green, sometimes almost black, foliage. However, a common concern among owners is “reversion,” where the plant’s characteristic pink coloring diminishes or disappears in new growth. This article explains the phenomenon of reversion and offers guidance on how to manage it, helping to maintain the plant’s vibrant appearance.
Understanding Reversion in Pink Princess Philodendrons
Reversion in a Pink Princess Philodendron occurs when new leaves emerge predominantly or entirely green, losing the desired pink variegation. This pink coloration results from a genetic mutation causing a lack of chlorophyll in certain leaf cells. The plant is a chimera, containing different genetic tissues: some producing chlorophyll (green) and others lacking it (pink). Even if a plant produces only green leaves, it remains genetically a Pink Princess Philodendron. The green sections contain chlorophyll, essential for photosynthesis and energy production, while variegated portions rely on these green parts for survival.
Primary Causes of Pink Princess Reversion
Insufficient Light
Insufficient light is the primary factor contributing to a Pink Princess Philodendron losing its variegation. Inadequate light forces the plant to produce more chlorophyll to maximize photosynthesis. This increased chlorophyll production often comes at the expense of pink variegation, leading new leaves to be predominantly green.
Genetic Instability
Genetic instability is another cause of reversion. Since pink coloration is a mutation, some plants are inherently more prone to reversion due to their specific genetic makeup. Green cells, more efficient at photosynthesis, can outcompete variegated cells, leading to a reduction or loss of pink over time.
Environmental Stressors
Environmental stressors can also indirectly contribute to reversion by weakening the plant. Factors like extreme temperature fluctuations, nutrient deficiencies, or improper watering can make the plant less resilient. A stressed plant may prioritize survival functions, such as maximizing chlorophyll production, over maintaining its ornamental pink coloration.
Optimizing Conditions to Maintain Variegation
Bright, Indirect Light
Bright, indirect light is essential for maintaining the vibrant pink variegation of a Pink Princess Philodendron. Too little light encourages green leaves, while too much direct sunlight can scorch delicate pink areas. Ideal placement is near an east or west-facing window, or a few feet from a south-facing window, possibly filtered by a sheer curtain. Supplementing with grow lights can provide consistent light and enhance pink coloration, especially in homes with insufficient natural light.
High Humidity
High humidity benefits Pink Princess Philodendrons, indirectly supporting variegation. These plants thrive in conditions similar to their natural rainforest habitat, ideally requiring 50-80% humidity. A humidifier effectively provides consistent moisture in drier indoor environments. Misting is less effective and can sometimes encourage pests or diseases.
Balanced Nutrition
Balanced nutrition supports vigorous growth and provides the energy needed for the plant to maintain variegation. During the growing season (spring and summer), apply a diluted, balanced liquid fertilizer monthly or every 4-6 weeks. Avoid over-fertilization, as it can stress the plant and potentially lead to root burn. During fall and winter, reduce or pause fertilization when growth naturally slows.
Light Pruning
Light pruning of purely green stems, before significant reversion occurs, can help direct the plant’s energy towards variegated parts. Pruning during the active growing season (spring to early fall) allows the plant to recover quickly and channel energy into new growth with desired pink tones.
Addressing a Reverted Pink Princess
Selective Pruning
If a Pink Princess Philodendron has started to revert or fully reverted to green, selective pruning can encourage variegation to return. Cut back stems that have lost their pink coloring to the last node that displayed variegation. This encourages new growth from an area of the stem still containing the genetic potential for pink. Use clean, sharp pruning shears and make cuts just above a node or leaf junction to promote healthy regrowth and reduce disease risk.
After Pruning
After pruning, carefully observe new growth. The plant’s response may not be immediate; it can take several months for new variegated leaves to emerge. Consistent optimal care, particularly bright, indirect light, is essential during this recovery. Gradually move the plant to a brighter area to allow acclimation and prevent leaf burn.
Propagating
Propagating variegated sections, if any exist, can also obtain new plants with a higher likelihood of retaining variegation. Cuttings with at least one node and a few leaves can be rooted in water or a suitable medium. This method leverages existing variegated tissue to produce new, potentially more stable, variegated offspring.