Peace Lilies are one of the most common houseplants that are grown indoors. These plants are loved for their beautiful leaves, attractive flowers, and air-purifying foliage. Its flowers also give out a sweet smell. These plants are easy to grow, but Peace Lily leaves turning black can be a problem sometimes. If you are facing a similar problem and desperately asking yourself: why are my Peace Lily leaves turning black, then keep reading this article because we have a solution for you. We will explain the main reasons behind the appearance of black spots on Peace Lily and share the correct ways to treat them.
Why Are My Peace Lily Leaves Turning Black?
Peace Lily leaves turning black indicate some common maintenance mistakes. Improper watering, poor water quality, over-fertilization, and fungal infection can be the main reasons behind this problem. Low humidity, cold injuries, and pest infestation can also act as contributing factors.
So before you can treat black spots on Peace Lily leaves, you must know the main reason behind them. Let us explain the above contributing factors one by one so that you can pinpoint the solution to your concern: why are my peace lily leaves turning black?
1 – Improper Watering
Peace Lilies are native to tropical rainforests of America. These plants receive sufficient watering from the frequent rains. It is why these plants need more watering when grown indoors as compared to other houseplants.
Underwatering is more likely to cause black leaves of Peace Lily than overwatering. So it is important to schedule the watering frequency and water the plant on time.
How Can You Properly Water Your Peace Lily?
You should water your plant once a week for its proper growth. And prune all the black leaves, and they cannot come back to life again. Overwatering can also cause black leaves due to standing watering, so you should avoid overwatering the plant as well. Do not water until the top 2 inches of the soil is completely dry.
2 – Poor Water Quality
Tap water contains many impurities, mainly chloride and fluoride. When these impurities get absorbed into the soil, they displace other essential nutrients. Instead of absorbing the essential nutrients, the plant absorbs the toxic chloride and fluoride. These two lead to a change in leaf color. Some leaves will turn brown, some yellow, while others will have black spots. So poor water quality is one possible answer to your question about why are my Peace Lily leaves turning black.
How to Improve Water Quality for Peace Lily?
You should use a filter for filtering your tap water. But if you do not have a filter at home, you should leave the water overnight as most impurities will evaporate or sit at the bottom in 24 hours.
The best way would be to use distilled water as it does not contain any impurities.
3 – Over-Fertilization
If this plant is fertilized more than the necessary amount, excessive salts build up in its soil. The collected salts clog the soil, making it impossible for roots to absorb water. No water absorption means no nutrient absorption. When some essential nutrients, such as copper, iron, magnesium, and potassium, will not be absorbed, parts of leaves will start to die due to necrosis. This is how over-fertilization becomes the reason for Peace Lily leaves turning black at tips.
How to Remove Excess Nutrients From the Soil?
Place the plant in a sink under a tap and let the water run through its soil. Once the excess water has drained from the soil, do this process again. Repeat it 3 to 4 times until all the impurities have washed away. Then set your plant aside until excess water drains from the drainage hole. Move back its pot to its original spot.
4 – Fungal Infection or Root Rot
If the soil is kept moist for the most time, it becomes prone to fungal infections and root rot. These turn the plant leaves black or black spots to appear on the green leaves. If you notice any such spots, remove the leaves immediately. The next step is to treat the fungal infection.
How Can You Treat Fungal Growth?
Even if you remove the damaged leaves, the fungus can be already present on healthy parts without you even knowing. So to eradicate fungal growth completely, you should use a fungicide.
Baking soda is the best antifungal agent, and it is also less damaging to the plant foliage. Mix one tablespoon of baking soda into a liter of water and spray the foliage with it.
If your plant has root rot, cut all the damaged and mushy roots, and wash the healthy ones. Also, re-pot the plant.
5 – Low Humidity
As mentioned earlier, Peace Lily is accustomed to living in rainforests. It means it needs high humidity to thrive, just like in rainforests. You should mimic the environment to that of its natural habitat by providing it with high humidity levels. If it is placed in dry air or low humidity, its leaves transpire quickly. With time, the leaves start to wilt and turn black. So if you are wondering why are my Peace Lily leaves turning black, you should check the humidity levels of your room. If the humidity is lower than 50%, you have got your answer: the black spots are due to low humidity.
How to Increase Humidity for Peace Lily?
You should use a humidifier to increase the humidity levels for your Peace Lily. But if installing a humidifier seems like an expensive way to you, you should try misting the plant. Daily misting also increases the humidity. You can also group your Peace Lily with other plants to create a highly humid environment.
6 – Cold Injuries
This tropical plant is not cold-hardy; it cannot survive in the cold. If the temperature drops below 25ºC, this plant cannot function well. In colder surroundings, Peace Lily can get cold injuries. These injuries occur due to disturbed metabolism as the water is not absorbed properly by the roots. The leaves start to wilt and turn black.
How to Fix This Problem?
You should not remove the damaged leaves immediately. Just move the plant to a warmer room; a greenhouse would be the best option. This plant will take some days to come out of the shock and become healthy again. When the temperature levels come back to the optimum range at the beginning of spring, you should remove the damaged leaves.
7 – Pest Attack
If you have checked for all the above factors, but none of them seem to be the main problem, then you should start looking for some hidden pests. Pests can also be one of the reasons for Peace Lily leaves turning black. This plant is prone to mealybugs, spider mites, and scales. These pests suck sap from the foliage and eat the leaves, leaving the leaves damaged. The damaged leaves then turn black.
How Can You Get Rid of Pests?
The best way to get rid of pests is to use DIY pesticide solutions. You can make one by using neem oil, rubbing alcohol, or dishwasher soap. Just mix 1-2 drops of either liquid in a liter of water. Then using a spray bottle, spray the foliage with this water. All the pests will be killed with this solution.
Peace Lily is an aesthetically pleasing plant that increases the lively factor indoors. But unfortunately, this plant is prone to black-spotted leaves. But now that you have read this article, you know exactly what to do and how to find the answer to your issue: why are my Peace Lily leaves turning black? Just pay attention to the above factors; find which one is causing problems to your plant, and start the treatment!