Reasons Why Peace Lily Leaves Slowly Turn Yellow and How to Deal With It
Thank you for the invitation. There are many reasons why peace lily leaves turn yellow. I have stressed repeatedly that you should take pictures, as pictures can serve as a reference and make it easier for a horticulturist to give you more direct care advice, or you can describe more details. Pot size, indoor temperature and humidity conditions, and your location all matter. The climate in the north and south is different, and care methods also differ slightly, especially in winter. In the north, indoors with heating, there are many care points to pay attention to. In short, the more you describe and the more pictures you provide, the easier it is for a horticulturist to diagnose pests and diseases for your beloved plant.
Based on care experience, I will roughly analyze several situations. The questioner can match them one by one and find the answer.
1. Peace lily leaves slowly turn yellow, with a single flower, and the flowering period exceeds 1 month, then slowly turns yellow, which indicates the flower has finished blooming. This is normal plant metabolism. Flowers bloom and fade, and there is always a time for that. The questioner does not need to worry too much.
Solution: For the spent flower, simply cut it off along the branching point at the leaf axil at the base of the stem. Right after cutting, be careful not to spray water and keep the wound dry. Avoid rot. For the outer flower branches, you can also hold the flower pot with your hand and use upward force, and the flower scape will pull out. If the questioner wants to extend the flowering period, the flower can be placed in a slightly cooler and shadier place, and the flowering period will be extended a bit.
2. Disease causes the peace lily leaves to slowly turn yellow. If the flower turns yellow and wilts before fully opening, and there is also rot, it indicates the plant is infected with pathogens.
Solution:
A. Medication can be used. Choose a fungicide, such as chlorothalonil or carbendazim or thiophanate-methyl or azoxystrobin or mancozeb. Spray 2-3 times in a row, once every 7-10 days. If there is no improvement, try agricultural streptomycin. Because no disease photos can be seen, the symptoms are unclear, and it is also impossible to determine whether fungi or bacteria are causing the disease. The questioner can only try on their own. Spray the stems and leaves and drench the roots at the same time.
B. If the indoor climate is suitable, about 15°C or above, you can consider changing the soil and replanting. If the soil carries pathogens, changing the soil can reduce the disease. Go to the flower market and buy clean, disinfected, pest-free peat soil (coconut coir soil, pine needle soil, leaf mold soil), perlite, and vermiculite mixed at 3:1:1. When repotting, check the root system, cut off diseased and rotten roots, let them air dry for a while in a naturally ventilated place, spray some fungicide, and replant. Rinse the original old flower pot clean with running water, expose it to the sun for disinfection, and set it aside for later use.
3. Other points to note:
A. In the north, for radiators, air conditioning vents, and underfloor heating, raise the feet and saucer. Prevent the plant from being dried out and speed up the yellowing of flowers.
B. For watering, choose misting. Do not spray too much. Water accumulating in the leaf center will cause rot and speed up yellowing.
C. In the south, when outdoors, avoid rainy weather.
D. Be careful of low-temperature freezing damage, and do not expose the plant to high-temperature scorching sun.
E. Be careful of pests, such as spider mites, aphids, and other damage.
That is roughly the analysis. If you have different opinions, leave a comment to discuss and exchange views. You can also share it with more people who need it. The questioner and fellow flower lovers, if you still do not understand, you can take pictures and continue to ask questions in the Q&A. Follow me and invite me to answer. I will reply as soon as possible.
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