Philodendron Selloum leaves occasionally turn yellow, indicating an underlying issue with the plant’s environment or care. Recognizing specific yellowing patterns helps diagnose the problem and allows for corrective action, ensuring the plant’s health and vibrant appearance.
Overwatering
Excessive watering frequently causes yellowing leaves in Philodendron Selloum, leading to root rot. Saturated soil deprives roots of oxygen, causing them to die and impairing the plant’s ability to absorb water and nutrients.
Overwatered leaves often turn a uniform yellow, becoming soft and mushy. Yellowing typically starts on lower, older leaves and can progress upwards. You might also notice dark, soggy patches on stems or a foul odor from the soil due to decaying roots. To address this, check soil moisture by inserting a finger two inches deep; water only when the topsoil feels dry. Ensure the pot has adequate drainage holes, and consider repotting with fresh, well-draining potting mix if severe root rot is suspected.
Underwatering
Insufficient watering also causes yellowing leaves. When a Philodendron Selloum does not receive enough moisture, it conserves water by shedding older leaves. The plant prioritizes new growth, often at the expense of older foliage.
Leaves that yellow due to underwatering tend to become crispy or dry, sometimes curling inwards or drooping. This yellowing usually starts on lower leaves and can be accompanied by wilting of the entire plant. To resolve, provide a thorough soaking until water drains freely from the pot. Establish a consistent watering schedule, allowing the top two inches of soil to dry out between waterings.
Light Issues
Both too much and too little light can cause leaf yellowing in Philodendron Selloum. These plants thrive in bright, indirect light. Deviations from this optimal light level can disrupt photosynthesis and overall plant health.
Excessive direct sunlight can cause leaves to develop a bleached or faded yellow appearance, often with scorch marks or brown patches. Conversely, inadequate light can cause leaves to yellow and drop, particularly older ones, as the plant lacks sufficient energy. Position your plant in bright, filtered light, such as a few feet from a south or west-facing window or closer to an east-facing window. Sheer curtains can diffuse intense light, or supplemental grow lights can be used in low-light environments.
Nutrient Deficiencies
Philodendron Selloums require a balanced supply of nutrients for healthy growth. A deficiency in specific nutrients can manifest as leaf yellowing, with distinct patterns. Nitrogen deficiency often causes general yellowing of older leaves, as the plant mobilizes nitrogen to newer growth.
Iron deficiency typically results in interveinal chlorosis, where areas between leaf veins turn yellow while veins remain green. This pattern is usually observed on newer foliage. Magnesium deficiency can present similarly, but yellowing often begins at leaf edges and progresses inwards. Applying a balanced liquid houseplant fertilizer can correct most nutrient imbalances. Ensuring slightly acidic soil pH (6.0-7.0) also helps nutrient absorption.
Pests and Diseases
Pests and diseases can cause Philodendron Selloum leaves to yellow, often as a secondary symptom. Common pests like spider mites, mealybugs, and thrips feed on plant sap, disrupting the plant’s physiological processes and leading to localized yellowing. Look for tiny webs, sticky residue, or visible insects on leaves.
Fungal infections can cause yellowing with spots, lesions, or wilting. Regularly inspect leaves, especially undersides, for early pest detection. If pests are present, isolate the plant to prevent spread and wipe leaves with a damp cloth or apply insecticidal soap or neem oil. For suspected diseases, remove affected leaves and ensure proper air circulation around the plant.
Environmental Stress and Natural Aging
Environmental stressors and natural aging can also cause yellowing leaves. Sudden temperature fluctuations, like cold drafts or extreme heat, can shock the plant, causing leaves to yellow and drop. Low humidity in dry indoor environments can also stress the plant, leading to brown tips and yellowing edges.
It is normal for Philodendron Selloum to shed older, lower leaves as part of its natural growth cycle. As these leaves age, the plant reallocates nutrients to newer growth, causing the older foliage to yellow and senesce. This gradual process affects only a few leaves at a time and is not a cause for concern unless yellowing is widespread. Maintaining stable room temperatures, avoiding direct drafts, and providing consistent humidity minimizes environmental stress.