The Raven ZZ plant, known for its distinctive dark, almost black foliage, is a popular choice for indoor greenery. Owners often become concerned when these normally deep-colored leaves begin to show reddish discoloration, which typically signals the plant is experiencing stress.
Understanding Raven ZZ Leaf Color
Mature Raven ZZ leaves typically display a striking dark green to deep purple-black hue, giving the plant its “Raven” name. New growth often emerges as bright lime green, gradually darkening as the leaves mature. Any deviation from this characteristic coloration, particularly red or purplish tints, suggests a response to environmental factors. Plants produce protective pigments called anthocyanins, responsible for red, purple, or blue colors, often as a defense mechanism when stressed.
Primary Causes of Red Discoloration
Excessive Light Exposure
Too much direct or intense light is a common reason for Raven ZZ leaves to turn red. When exposed to bright, unfiltered sunlight, especially in southern climates, the plant’s leaves can develop a reddish or purplish tint as a form of “sunburn.” This protective color change is the plant producing anthocyanins to shield its chlorophyll from damage. While Raven ZZs tolerate a range of light, direct sun can scorch the foliage.
Cold Stress
Exposure to low temperatures or sudden cold drafts can also induce red discoloration. Raven ZZs thrive in warmer indoor environments, preferring temperatures between 60-75°F (15-24°C). When temperatures drop below 50-60°F (10-15°C), the plant experiences cold stress, leading to cell damage that manifests as reddish or purplish leaves. Placing the plant near cold windows, exterior doors, or air conditioning vents can cause this stress.
Natural Leaf Senescence
Like all plants, Raven ZZs undergo natural leaf aging, or senescence. As older leaves reach the end of their life cycle, they may turn yellow or develop reddish tones before dying off. This is a normal part of the plant’s growth and does not indicate a health problem. These older leaves are typically found at the base of the plant and are shed to reallocate resources to new growth.
Corrective and Preventative Measures
To address red discoloration from excessive light, relocate your Raven ZZ to a spot with bright, indirect light. Placing it near an east-facing window or a south-facing window with a sheer curtain provides suitable illumination without harsh direct sun. This allows the plant to recover from light stress and encourages its leaves to return to their characteristic dark coloration.
For cold-stressed plants, ensure a stable environment where temperatures remain consistently within the ideal range of 60-75°F (15-24°C). Move the plant away from drafty windows, exterior doors, or air conditioning vents, particularly during colder months. Maintaining warmth and avoiding sudden temperature fluctuations helps prevent further cold-induced discoloration.
If red leaves are due to natural senescence, no specific corrective action is necessary. These leaves are simply aging and will eventually fall off. You can gently remove them for aesthetic purposes, allowing the plant to focus its energy on new, healthy growth. Consistent watering, allowing the top inch or two of soil to dry out between waterings, and using well-draining soil also support overall plant resilience.