IT can be disheartening to see your beloved pothos plant changing its color from deep green into black pothos. And the worst part would be losing your favorite indoor companion to devastating diseases such as leaf spot or root rot. But what causes black spots on pothos leaves? This article is just about that.
The main causes of black spots on pothos leaves are overwatering, direct sunlight, low humidity, pests, and diseases.
Compare: Why Are Pothos Leaves Turning Brown?
How to Identify Black Spots on Pothos
Identifying black spots on pothos leaves is relatively straightforward, but it’s essential to distinguish them from other types of discoloration or damage.
Here’s how you will know you are growing and caring for a black pothos:
Color and Appearance
Black spots on pothos leaves will appear as small to large areas of dark discoloration. They may range from tiny specks to larger irregular patches.
Location on Leaves
Black spots can appear on any part of the leaf surface. They may be scattered randomly or concentrated in specific areas.
Texture
The texture of the affected areas may vary depending on the underlying cause. In some cases, the spots may be slightly raised or sunken.
If caused by diseases, the spots may have a fuzzy or powdery appearance.
Spread
Black spots may start small and gradually spread across the leaf surface if left untreated. They can also spread to adjacent leaves and new growth if the underlying issue persists.
Accompanying Symptoms
Black spots may be accompanied by other symptoms such as yellowing of leaves, wilting, leaf drop, or overall decline in plant health.
Examination of Plant
Inspect the entire plant, including the undersides of leaves, stems, and soil, for signs of pests, fungal growth, or other abnormalities that may contribute to the development of black spots.
6 Causes of Black Spots on Pothos Leaves & Their Fixes
Now that you’ve identified black pothos in your house, it is time to know the causes and fixes of pothos leaves turning black if you can.
Here are the six main causes of black leaves on Pothos leaves and the steps to fix the respective causes:
1. Overwatering or Poor Drainage
Overwatering can lead to root rot, which in turn can cause black spots on the leaves. Make sure the plant is not sitting in water and that the soil has proper drainage.
How to Fix: Allow the soil to dry out between waterings and ensure the pot has drainage holes. Adjust your watering frequency to prevent waterlogged conditions.
2. Fungal or Bacterial Diseases
Diseases like leaf spot (caused by fungi) or bacterial infections can lead to black spots on the leaves.
How to Fix: Trim away affected leaves and improve air circulation around the plant. Avoid overhead watering to prevent the spread of diseases. You can also use fungicides or bactericides labeled for houseplants, following the instructions carefully.
If you are looking for the best fungicide for houseplants, my recommendation is Bonide Captain Jack Copper Fungicide (pictured ⬆)
3. Pests
Pests such as spider mites or aphids can cause damage to pothos leaves, leading to black spots.
How to Fix: Inspect the plant regularly for signs of pests. Treat infestations with insecticidal soap or neem oil, following the instructions on the product label.
4. Nutrient Deficiency
Lack of essential nutrients, particularly magnesium or calcium, can cause black spots on the foliage of your pothos plant.
How to Fix: Fertilize the plant with a balanced, water-soluble fertilizer formulated for houseplants. Follow the recommended dosage and frequency on the fertilizer label. You may also want to use a fertilizer specifically designed for foliage plants.
Related: Best Fertilizer for Snake Plant
5. Environmental Stress
Extreme temperatures, drafts, or sudden changes in light conditions can stress the plant and lead to black spots on the leaves.
How to Fix: Keep pothos plants in stable environmental conditions with moderate temperatures (ideally between 60-85°F or 15-29°C) and indirect light. Avoid placing them near drafty windows or vents.
6. Physical Damage
Rough handling or damage to the leaves can result in black spots as the tissue decays.
How to Fix: Handle the plant gently and avoid causing damage to the leaves. Trim away any damaged or diseased parts promptly to prevent further spread.
Black Spots on Pothos Leaves FAQs
Q: What causes black spots on pothos leaves?
A: Black spots on pothos leaves can be caused by various factors, including overwatering leading to root rot, fungal or bacterial diseases such as leaf spot, pest infestations like spider mites or aphids, nutrient deficiencies, environmental stressors like extreme temperatures or drafts, and physical damage to the leaves.
Q: How do I prevent black spots on my pothos leaves?
A: To prevent black spots on pothos leaves, it’s essential to establish good cultural practices. This includes watering the plant appropriately by allowing the soil to dry out between waterings, ensuring proper drainage, providing adequate air circulation around the plant, avoiding over-fertilization, maintaining stable environmental conditions with moderate temperatures and indirect light, and practicing regular inspection for pests and diseases.
Q: How do I treat black spots on pothos leaves?
A: Treatment for black spots on pothos leaves depends on the underlying cause. If caused by overwatering, adjust the watering routine, and improve drainage. For fungal or bacterial diseases, remove affected leaves and apply appropriate fungicides or bactericides. Control pest infestations with insecticidal soap or neem oil. Address nutrient deficiencies by fertilizing with a balanced fertilizer. Additionally, maintain optimal growing conditions to promote plant recovery and prevent further damage.
My Final Thoughts on Pothos Leaves Turning Black
In conclusion, black spots on pothos leaves can signal various underlying issues, including overwatering, pests, diseases, and environmental stress.
By maintaining proper watering practices, providing adequate light and airflow, and promptly addressing any signs of disease or pest infestation, you can help prevent and manage black spots, promoting the health and beauty of your pothos plant.
Regular care and attention will go a long way in ensuring thriving foliage and vibrant growth for your pothos.
