Hi Marlene, Why Are My Mint Leaves Turning Black: Everything You Need to Know to Prevent Black Spots on Mint Leaves. If the brown or black spots are on the underside with a corresponding yellow splotch on the top of the leaves, suspect rust, a fungal infection. Just like any other herb plant, you need to ensure rich and moist soil for mint. The benefits of mint extend far beyond your breath; mint may also help soothe digestive trouble, reduce skin inflammation and increase exercise performance. Mint Geneva, Switzerland. How to Store Fresh Mint Leaves in the Freezer (2 Quick and Easy Ways) When you want to keep fresh herbs for more than a few weeks—perhaps even months—enter the freezer method. First and foremost, if you think that the disease is at a mild stage, you must separate and remove the infected leaves from the rest of the plant. Why mint leaves turning black? Another common reason for having black spots on mint leaves is mint rust. Mint is a rapidly growing herb that thrives best in full sun to partial shade. The next step is to create two to three holes at the bottom of your plant container. These spots can start off small, but if left untreated, can grow to the size of the entire leaf. Save to My scrapbook There’s no fungicide treatment for verticillium wilt; thus, it is best to completely eliminate the mint plant. Mint plants do not thrive in high-salt content, therefore leach the soil at least three times to flush out any residues. This site is a participant in the Amazon Services LLC Associates Program, an affiliate advertising program designed to provide a means for sites to earn advertising fees by advertising and linking to Amazon.com. Thus, it is best that you fertilize your mint plant’s soil once or twice in a year to provide sufficient nutrients for healthy growth. If that is the case, then it is time that you free up some space for better aeration. You May Also Enjoy: Why Is My Mint Turning Brown? Direct exposure of high temperatures can dry up mint leaves and turn them black. However, if the base of the plant stem is brown or black, then it will be very difficult to save your mint. Have you tried numerous options available out there but still failed to maintain its health? Below 7 reading indicates the high salt amount, you can minimize its presence by mixing it with other soil and creating a potting mix. Do you ever wonder why the leaves of your mint plant turn witty and black? I have a lot of wild mint in my yard, which I love. Aphid causes mint leaves to turn black and eventually … Today I noticed the same type of aphid-like tiny dots on a different mint plant about 25 ft away, clear on the other side of the garden as well as a host load of strawberry leaves with a different type of leaf blight (the leaves of which I also removed). Posts: 16. posted 3 years ago. Tip #4: Remove the affected areas by cutting them off from the stem to make sure the rest of the mint stem grows healthy. Soil that is too dry and lacks moisture content makes it harder for herbs to grow. They always come back the next year, but I don't like to use the mint with these spots. Over-fertilizing your mint plant can hamper its growth and can invite weeds to grow on it. Herb plants will develop yellow to black foliage if it does not meet certain conditions. Let us look at some common reasons for mint leaves turning black and how to prevent it from happening black spots on mint leaves: You may have heard that mint plants require regular watering, but keep in mind that overdoing it can lead to black or brown leaves on the bottom layer of the plant and overgrown roots. Moreover, it would be best if you use a fertilizer that has organic matter in it. This can be because of a disease or exposure to high temperatures. To guarantee that there is no transfer of fungus, just wash the rest of the healthy leaves with water. The extra space will allow the roots to spread and grow well. or why black spots on mint leaves? Leaf blight of mint occurs during winter or cool weather. Verticillium wilt comes from a fungus in the soil. It looks like the faeces of insects, probably the aphids. So, ensure you find the balance between both. After completing my bachelor of science in agriculture, I'm serving as a civil service officer at the Department of Agricultural Extension, Bangladesh. Keep your mint plant far away from driveways or pathways as it will ensure it stays safe from dust and any other physical damage. Once that is done, start a habit of watering your plant less, especially during cool or moderate months, when the water does not evaporate easily and sits around the plant’s roots. Mint rust occurs because of fungal spore infestation, and apart from black leaves, you’ll notice mint leaves turning yellow or bright orange during late summer. Mint rust is a common fungal disease of garden mint, but also affects marjoram and savory. Finally, if your mint leaves are turning black then the above mentioned actionable tips will solve your problem. Mint Aphid is one of the insects that can turn your mint leaves black. If you move your mint plant to a cooler spot, the chances are that the humidity would still be high there. We are compensated for referring traffic and business to Amazon and other companies linked to on this site. It starts with tiny black spots on leaves, no bigger than a pinhead. When mint leaves turn black, it is a sign of distress. Symptoms of this fungus involve twisting, curling, and stunting of the upper mint leaves. If you find them in combination with the black spots, then you can be sure that your basil is invaded by leaf miners. Mint leaves are the aromatic herbs which are used fresh as … You should observe your garden and find out tiny black eggs on plant leaves soon. During the warmer months, aphids give birth to about 5 young insects per day. How to Prevent Mint Leaves Turning Black from Excessive Heat and Humidity? Indeed, if the black spots are the feces, then the leaf miners have eaten your leaf in some spots. Does it make the mint unusable and how can I get rid of it? Drops appeal to sooty mold which makes leaves black. MINT MYTH: DO NOT EAT THIS… When I first realized how bad mint is for human reproductive health, it actually made me a bit sad. It thrives well into warm and not too humid environments. I am sharing all the practical tips on how to grow various plants, flower plants, vegetables in the garden. Fungi love slight darkness and moisture. Read on to learn how you can prevent this disease from spreading to the rest of your plants: How to Prevent Mint Leaves Turning Black from Mint Rust? There are many reasons and ways to put your mint plant in distress. Make sure you dispose of the affected leaves by either burning them or throwing them away. First, you must ensure that you’re using the right kind of soil. Try to grow the mint plant in a particularly designed pot for herb plants as they provide adequate room for optimal growth. Look for salt builds or white matter on top of the soil as high-salt indicates over-fertilization. You can easily determine the fertilizer dose by reading the instructions on the fertilizer package. Symptoms of these diseases include curling, twisting, and stunting of the upper leaves. Young mint leaves are more prone and vulnerable to pests and diseases; this always keeps a close look at them. Split it into half and pour on the roots as routine. You can transfer it indoors to keep its atmosphere warm. Additionally, try to water your mint plant in the morning so that it gets ample time to evaporate the water. How to Save Areca Palm from Root Rot (Step by Step). Dracaena is one of the most favorite foliage plants both for indoor and outdoor settings. 7 Causes of Mint Leaves Turning Black & Their Solutions, Tips to Prevent Your Mint Plant From Turning Black, Frequently Asked Questions (FAQ) About Black Mint Leaves, Ortho MAX Garden Disease Control Concentrate, Ultimate Guide: How to Grow Sage From Seed, How often do you water a ponytail palm (Well Researched Tips), Square Foot Gardening Strawberries (Unbelievable Ways), Dieffenbachia plant: Plant, Grow and Care Tips, How to grow citronella plant from cutting, 11 Top Most Expensive House Plants (Incredible Plants), Top 13 Vegetables that grow above the ground, Best 15 House plants with red and green leaves (Exclusive Guide). Remember, mint thrives best in light soil with adequate drainage to allow easy water flow to pass through it and keep the roots healthy to sustain its growth. This can cause the lower leaves to turn dry and gradually to black. Yet just today I noticed there's some white spots on some leaves surface, tried … Ramsey County Minnesota. We hope this article helps you sustain your mint plant’s health and allows it to reach its maximum potential! It needs plenty of water during summer and ensures to. Initially, the fungus appears as a greyish leaf spot, often on the underside of leaves. Is this a disease or a nutrient deficiency? And how to treat it? What caused the dark spots to appear on the leaves? Black Spot. Bacterial Blight of Mint. Eventually, with time these colors would turn black. If they still appear then going for any insecticidal soap will be the best option. Over Fertilizing the plant can decrease plant growth and invite weeds to grow on it. It is usually green, yellow, brown, or black in color. If there is an enormous presence of aphid, then spraying insecticides on it can do the job right. Mint thrives in a well-drained, moist, loamy soil with organic matter. If the pH tester shows a value below 7, it indicates that your soil is high in salt and needs to be fixed. When the plant goes into a dormant stage that turns the entire leaves black. Other reasons can fall under inadequate care in terms of temperature, watering, and soil type. If excess heat or sunlight is bothering your mint plant, the first thing you must do is to relocate the plant into a cooler or shadier place. As the bacterial leaf spot progresses, the leaves may turn yellow to brown or black before they die. It is important to regulate it within its requirement from 69-84°F (21-29°C), but you need to shade it from the extreme temperature of the sun. Tip #2: If you’ve grown your mint plant outdoors, try to transfer it indoors to provide a warmer atmosphere. Although it is not a common disease, leaf blight spreads swiftly and leads to entire mint leaves turn black and fall prematurely. 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