What causes brown spots on mint leaves?
Last spring, the leaves on my mint plant were dark green and beautiful. This spring, the leaves have dark spots on them and reddish veins running through the leaves. What caused the dark spots to appear on the leaves?
Brown spots are signs of bacterial infection from the overgrowth of microbia that naturally exist in the soil. Overhead watering, excessive moisture from rain and dew, and poor air circulation around plants can contribute to the problem. A healthy plant like mint can usually survive, unlike sweet basil. It is important to avoid the splashing of wet soil onto the plant by watering gently around the stem and drip line and water early in the day. Make sure the plant gets 6 hrs. of good sun each day. Remove any leaf litter or yellow leaves, and disinfect pruning tools with a 1:10 solution of bleach to water. There is a broad spectrum organic fungicide on the market called "Serenade." Its ingredient, bacillus subtilis, is an effective control of leaf spot. Red veins on peppermint are normal. Crinkly leafed spearmint has green veins. Hope this helps!
Make sure you have a fresh mix of nutrients and water and then get a meter and PH testing kit to check levels. Also make sure your mint leaves have an ample amount of light. If that doesn't work, like “cat on a soapbox” says, the plant may have a fungal problem, fleas, mites or spiders.
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