Water the peonies during dry periods. Cause: if peony flowers grow in alkaline soil, their leaves will turn yellow after a period of time. The leaf curl happened as soon as the peony started growing and to bud stage as you can see. Water peonies when the top 1 to 2 inches of surrounding soil becomes dry. Spray on your peonies every 10 to 14 days throughout the summer months. Prevent cultural damage by planting peonies in full sun to partial shade and fast-draining soil. Dooley holds a Bachelor of Science in business management and finance. Infected tissue becomes tough and leather-like. Prevent leaf blotch by keeping the peony leaves dry, as the fungus spreads easily through water. Stop the introduction of peony wilt to your garden by removing weeds and debris from around the plants. This has never happened before. But they go on and bloom very well for me when the weather warmed up and the leaves started to look normal. A lack of water will make the leaves curl. But you don't have to cover the plant--frost won't kill the a peony plant, and in fact "dying back" for the winter is perfectly normal. You can also use a homemade solution—mixing together a tablespoon each of baking soda, horticultural oil (or canola), and liquid dish soap (without bleach) with a gallon of water. She has worked as an accountant, after-school director and retail manager in various locations. Plan the perfect garden with our interactive tool →, University of Minnesota: Diseases of Peony. If left untreated, the spots will grow and collide, causing entire leaves to turn purple or reddish-brown. Clear the ground surrounding the plant often to remove weeds and debris. If the plant gets too dry, the leaves will eventually fall off. Learn which plants thrive in your Hardiness Zone with our new interactive map! The underside of each spot is reddish-brown in color. Leaves curl on peonies under certain conditions. Frost will make the plants die back for the winter. Lack of water can make their leaves curl up to avoid having to nourish them. The fungus will eventually spread to the plant's stems, discoloring the tissue as it goes. Typical symptoms include glossy purple to brown spots and blotches on the upper surfaces of the leaves. Leaf blotch is a result of the fungus Cladosporium paeoniae. The fungus Phytophthora cactorum causes this disease, with symptoms similar to peony wilt. If they don't care, it will not only aggravate the phenomenon of yellowing, but also lead to death. Remove any plants with mosaic, or "leaf curl." For plants in the ground, you can place a plastic bag over them to insulate them from the cold. Tiny red to purple spots appear near the veins of the peony leaves. Peony bushes absorb water through soil. Copyright Leaf Group Ltd. // Leaf Group Lifestyle. For plants in the ground, you can place a plastic bag over them to insulate them from the cold. This disease is caused by the fungus Botrytis paeoniae. University of Illinois Extension: Red Spot, Leaf Blotch, or Measles of Peonies, University of Minnesota Extension: Diseases of Peony. Peonies subjected to prolonged periods of insufficient water and exposure to temperatures above 90 degrees Fahrenheit may suffer from leaf scorch, or the browning of leaf tips and margins. Although peonies (Paeonia spp.) Check to see that the roots aren't damaged if the peony plant is getting plenty of water and there is no sign of insect damage on the leaves and flowers. Black spots on peony leaves are caused as a result of watering the peony bushes from the top. All Rights Reserved. Sometimes an insect or small animals might have disturbed the roots, preventing water from getting to the plant. Botrytis blight is a common fungus disease on peonies. When they curl it is a signal that something is wrong with the plant. Prevent leaf blotch by keeping the peony leaves dry, as the fungus spreads easily through water. Tara Dooley has written for various websites since 2008. This will prevent them from becoming frostbitten. Peony leaves will turn brown if certain cultural requirements are not met or if they become infected with leaf blotch, peony wilt or phytophthora blight. If this happens, take steps to correct the situation before it harms the peonies any further. are easy to grow and require little maintenance once established, they are not without problem. Water the peonies during dry periods. They don’t need water to be sprinkled on their surface. Plants cannot come back from such a virus, and the virus will spread to other plants if not removed. Clear the ground surrounding the plant often to remove weeds and debris. If the plant gets too dry, the leaves will eventually fall off. No longer able to support itself, the dead tissue collapses and hangs downward, giving the plant the appearance of wilting. Fertilize peonies in the spring with a low-nitrogen, slow-release fertilizer. Last spring the buds on my peonies swelled up but turned brown and dried up before the flowers emerged. Spray the soil, leaves and stems with a fungicide in the spring. Remove and burn infected plants immediately to eradicate the disease. When botrytis appears, it’s very important to clean up the peony patch of all plant debris in fall, putting it out with the trash. Brown peony leaves may also be a result of the phytophthora blight. Avoid planting peonies in the hottest areas of your garden. Some peonies seem to be affected by this. Leaves curl on peonies under certain conditions. A lack of water will make the leaves curl. Deadheading peonies helps, as does cutting back peonies in fall. Use clean pruning shears and gardening tools when working around peonies. © Copyright 2020 Hearst Communications, Inc. Taylor's Guide to Growing North America's Favorite Plants; Barbara Ellis. Remove and destroy infected plants and surrounding soil to stop the disease's spread. University of California IPM Online: Peony - Paeonia spp. Lack of water can make their leaves curl up to avoid having to nourish them. This doesn't mean the plant will die, but it doesn't help the plant look pretty. If done so, they become an ideal environment for germination and growth of fungi. But if you aren't ready for it to happen yet, placing a plastic bag over the plant or bringing it in the house overnight will prevent it. This doesn't mean the plant will die, but it doesn't help the plant look pretty. Bring in potted peonies when weather conditions suggest temperatures might drop below freezing. Dark grey fuzzy mold may be present on the infected tissue. Peony plants may develop brown leaves if certain cultural requirements are not met. If the stems and leaves of your peony suddenly turn brown and begin to wilt in the early spring or summer, the plant may have contracted peony wilt. Symptoms include curled leaves, patterns of yellow spots on the leaves, and shortened growth. If left unattended, the plant could eventually die. How can I prevent this? Knowing how to recognize and prevent these problems will ensure that your peonies remain healthy and green. The fungus attacks and kills the tissues of the peony's leaves, stems and flower buds. One indication of this happening is the leaves wilting and curling. Over-fertilizing your peony may eventually burn the plant's leaves, causing them to turn yellow, then brown. The best prevention method is to plant disease-free peonies in an area with fast-draining soil and adequate air circulation. This is just one of the diseases that can affect peonies. The fungus attacks the stems and leaves of a peony, turning the tissue dark brown or black. The only thing that I found that was different with this year was very mild winter and then followed by a very cold early spring. Or, it could be one of the most common disease of peonies: peony leaf blotch, This disease is caused by the fungus Cladosporium paeoniae and is also known as stem spot or measles. Powdery mildew is another of the common peony diseases which covers leaves with a white powdery coating.