Solutions The most common cause of Alocasia leaves turning yellow is overwatering. Treat as described above. This fungus infiltrates the plant and grows rapidly inside these water and nutrient carrying tubes. If things still don't get better, may have to just discard the plant. Providing proper and consistent soil moisture is important in caring for an Arrowhead Plant. Would this be the reason? Too much water can be just as damaging to leaves. When the leaves of the plant begin to die, they will start turning yellow. As the blisters age, they harden and form white or brown wart-like bumps and eventually cause the foliage to yellow and drop. Fungicides are available against mildew but you must choose one that is specifically for mildew on marigolds. Leaves turning red is usually not a symptom of overwatering. In some cases, leaves become curled or twisted or turn yellow due to the infection. Chlorophyll is what gives the green color to leaves and allows the use of sunlight for food and energy production. This may be what is causing your yellowing marigold leaves. To understand the science behind this, we must first look at the contents of a typical leaf and its relationship to the plant’s overall health. This has happened whenever and whatever garden I've planted either French or African style marigolds: within a day or two the leaves start turning purple, sometimes a lot, sometimes a bit. It makes your health plant a dead bamboo plant. So, this holiday season, we created a giving campaign for two of our favorite non-profits who are working to help put food on the tables of hungry families across the U.S. and around the world. The excess water then builds up in the plant causing small, swollen blisters on marigold leaves and flowers. Powdery Mildew – The most familiar symptom of a powdery mildew infection is powder. Tagetes, yes, commonly known as French Marigold. Insufficient light, low humidity, and lack of warmth, nutritional deficiencies, pest infestation, or disease are other possibilities. Leaves of affected plants may yellow before flowers sprout small, deformed leaf-like growths. Oftentimes, treatment with neem oil can help with this. Kristi Waterworth started her writing career in 1995 as a journalist for a local newspaper. Sign up to get all the latest gardening tips! If it is warm and your marigold leaves are turning purple, the problem is very likely within the soil. Sometimes they pull out of it, sometimes not. Why are the leaves on my Aglaonema turning yellow? From there, her meandering career path led to a 9 1/2 year stint in the real estate industry. © Copyright 2020 Hearst Communications, Inc. American marigolds are most susceptible to this problem, but French and dwarf varieties are not. Aster yellows is caused by a very small organism known as a phytoplasma. Hoya leaves turning yellow because of the incorrect amounts of light, water, and fertilizer. This may not seem relevant to your marigolds with yellow leaves. Yellow leaves on marigolds can be attributed to many things. The most common reason plant leaves turn yellow is because of stress. Provide affected marigolds with well-draining soil and water sparingly -- too much moisture will only encourage further fungal growth. Causes of Hoya Leaves Turning Yellow A lack of water will cause the plant to slowly dry out, with the leaves turning yellow from the tips downward. You cannot cure marigolds with aster yellows. You’ll know your plants have leaf burn if the yellow leaves on marigolds are actually a yellowing of the tips and margins of the leaves. Our marigold leaves (in India) have been turning white too. Whether due to inadequate watering, excessive heat, or pest infestations, yellow leaves are a sign of sickly cannabis plants and must therefore be addressed as soon as possible. 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