These plants tolerate drier soil, and should be planted in well-draining pots and kept barely moist. I notice it about every 2-3 days. In severe cases, the leaves turn yellow and may fall off. Grown throughout the United States as an annual, this tender perennial is hardy in U.S. Department of Agriculture plant hardiness zones 10 and 11. Diagnosing the problem requires examining your geranium's care, and adjusting your regimen accordingly. Standard red and dark red flowering cultivars tend to be the most resistant to leaf yellowing, while white, pink, and lavender are the most sensitive cultivars. 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Feeding causes brownish, round sunken spots on leaves Nymphs are red or red and black; adults are greenish yellow with 4 black stripes, ¼ to 1/3 inch long More information on Four-Lined Plant Bugs I just flick the leaves and it fall/rolls off the leaves. Understanding the Warnings. Pelargoniums that are planted too close together also tend to develop red leaves. It’s best to water geraniums when they needit and the simple way to know that is with a finger test. Sign up to get all the latest gardening tips! Most geranium … Yellow and Curled Brown Leaves on Perennial Geranium. If you are having night time temps 55 or below, this will inhibit the absorption of these trace minerals. The tell-tale sign of this is when the affectedleaves are all at the bottom of the plant. Geraniums are one of the most loved garden plants because of their low maintenance, long bloom time and variety of flower and foliage color. I put them in my walkout basement in front of sliding glass doors that face east. I’ve had this plant for several years, and know geraniums like to be pot bound, but not sure if the problem is that it needs a larger pot. Potted geraniums often suffer from sitting in full saucers and getting waterlogged. It lives in the soil and enters the plant by its roots, resulting in yellow, red, and brown leaves on your geranium as the plant dies. The leaves turn yellow, then curl up to a crisp brown. … It is time to move geraniums back to the greenhouse or to take cuttings for next year. This may be because the plant is receiving too much water or too much sunshine, or has been planted outdoors too early or in mineral-deficient soil. Root systems rot, causing the geraniums to topple over. However, if you wish to overwinter geraniums, you should pick off the red leaves and move the plant indoors. ready to brighten hanging baskets, window boxes and sunny borders. Sign up for our newsletter. Photo: CriticallyChallenged, reddit.com. I thought perennial geraniums were hardy plants without any pests or diseases. Red geranium leaves signal the plant is stressed in some way. Many geranium hybrids are resistant to this condition. This is a physiological condition that is call oedema (uh-DEEM-a) and is caused by cells in the leaves that burst because the plant takes up too much moisture without transpiring. Red geranium leaves can be a symptom of minor problems, such as over or under watering, nutrient decencies or cool temperatures. I have tried just about everything, including all sorts of fungus and disease sprays. Why Are My Geranium Leaves Turning Red? If it is a specifically rainy period or time of drought, water may be causing red geranium leaves. Question: I saved a few geraniums from my garden and brought them indoors for the winter.Now they’re losing a lot of leaves: they turn yellow and cling to the plant. 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