You also need to evaluate the amount of sunlight that the plant receives. The lack of water means the roots are unable to provide nutrients and moisture to the plant. Prolonged saturation leads to diseases that kill an entire plant, not just its leaves. If the same symptom appears in new leaves, then it is likely … glossy green leaves and bountiful blooms. This is a powdery fungus, usually white in color, which tends to grow on the yellowing part of the leaves. Rhododendrons grow best in soil that is consistently moist but never soggy. You don’t need to worry about this if it’s just a problem for a few hours as the leaves will bounce back and become healthy again. The soil test will also show you if you need to do any amendments to the soil. Epsom Salts* According to the American Rhododendron Society, if the plant has older leaves that have turned yellow between green veins, you likely have a Magnesium deficiency.Sprinkle some Epsom Salts* around the plant to correct the issue.. Iron Sulfate*. One of the most common problems with rhododendron and other plants in the garden is the lack of water. It’s recommended that you avoid overwatering from the top, as the plant could sustain considerable damage. It is a genus of more than 1,024 woody plants that are found primarily in parts of Asia. The nights turn cooler and the days become warmer, which provides the perfect atmosphere for the fungus to spread. Spray the mixture as per the instructions on the leaves of the plant to get rid of the pests. These nutrients are required by the plant to thrive and to maintain the quality blooms. But I started seeing browning of some of the leaves. The plant will start exhibiting clear symptoms as the leaves will begin to wilt and the health of the plant will suffer drastically. If the plant gets stressed due to the transplant, it will tend to grow poorly and you may see browning of the leaves. Hi. Another common problem that can cause the leaves to turn brown or yellow is powdery mildew. This is a problem you may face in the winters especially if you live in a flat area or your rhododendron is planted in a balcony. Some other pests like vine weevil will eat away at the stems causing a lack of nutrients in the leaves and turning them brown. Your rhododendron leaves are turning brown because they may be suffering from scorched leaves. You might want to take action and get rid of the mildew as quickly as possible before it spreads to other parts of the plant. The stressed roots won’t be able to provide nutrients and moisture to the plant including the leaves causing them to turn brown. Rhododendrons should be watered regularly and thoroughly so that each plant's entire root zone is mois… Or you’re not watering the soil well enough especially when growing in a container. Your plants are going to be most susceptible to powdery mildew during the spring and the fall season. The Practical Planter is a participant in the Amazon Services LLC Associates Program, an affiliate advertising program designed to provide a means for us to earn fees by linking to Amazon.com and affiliated sites. Since the roots are unable to provide nutrients to the plant, the leaves will turn brown. These attack the pests and get rid of them. You'll find useful information here whether you're growing vegetables in an apartment, patio, or a raised bed. The latter is … Save my name, email, and website in this browser for the next time I comment. Is there anything I can do to prevent it? This fungal issue occurs because you are either overwatering the plant or the soil has got compacted by people or animals walking over it. Keep in mind that the infected parts of the plant will not be saved, so you have to cut them and get rid of them. Welcome to my website where I write about growing your own organic food in a limited space. You need to ensure that the plant gets about an inch of water every week. They will become droopy and may fall off. They sometimes contain numerous small, black fruiting bodies of the causal fungus; Rust: I’ll share what I learn as I develop my green thumb. Like pests, diseases can attack the plants including rhododendron in your garden. Underwatering has the same effect. Why rhododendron leaves turn brown? Eventually, the leaf turns brown and will fall off. If the roots are planted too deep, they don’t get the required aeration. You need to make sure that an acidic fertilizer is used for feeding the plant before it blooms, and that’s going to ensure that the plant remains healthy. The stems of the plant might also sustain some damage, and you might notice discoloration appearing at the soil level of the plant. Type above and press Enter to search. You should know that the leaves that are affected by the fungus will also begin to curl up inward and then drop off on their own. The plant is unable to get enough moisture from the roots due to the cold and this causes the leaves to conserve the moisture. This disease attacks the branches and leaves of the plant causing them to dry and turn brown. Both have doubled in size in the space of a few months and had been growing very well. After a week, you can transplant the seedling to your garden as it has gotten comfortable in the outdoor environment and won’t suffer from transplant shock. Rhododendrons, azaleas, and camellias are amongst our most spectacular flowering shrubs. The leaves could also turn brown because of a lack of water. The mulch helps keep the soil moist longer and prevents the soil from splashing on the leaves. The first impact of such an issue is on the leaves that will start turning brown and dying. If the rhododendron plant is getting too much heat in summer, the leaves will get scorch burn and start turning brown. You will also notice a distortion in the flowers. Essex, United Kingdom . I don’t recommend using chemicals in your garden but there might be some instances where you need to use them. Discovering the cause will make treatment options much more effective, and employing basic preventive practices will enable you to avoid the problems in the future. This means you need to ensure the seedling gets used to the outdoor environment. You should know that this is a serious problem because your entire plant might eventually die. I suggest hardening the plant before you transplant it outdoors in the garden. Needless to say, the plant is a mainstay in most gardens, mainly because it adds a touch of color and makes the place look incredibly pretty. The rhododendron plant prefers slightly acidic soil with a pH of 6-6.5. The rhododendron plant likes to grow in a loamy soil. And this will cause the leaves to turn brown and wilt. It is also the national flower of Nepal, and the brightly colored flowers produced by the plant usually bloom all the way from the late winter until the first few weeks of summer. This means it should be light with good aeration. But if the problem keeps occurring for many days, you need to protect the plant by using a row cover at night. This could happen due to the hot sun or cold winter winds. Happy planting! I'm Kevin, your friendly neighborhood gardener. The rhododendron plant has shallow roots and you need to keep a portion of them above the ground. The plant is about 7 feet tall and 6 feet in diameter. If you’re starting to grow a rhododendron remember that it’s better to plant them in a spot that has partial shade such as behind a tree or a wall. If you do use herbicide, make sure to follow the instructions and use the right amount. Rhododendron Leaf Problems. One potential Rhododendron problem is that the leaves are turning yellow. This helps improve the texture of the soil as well as encourage beneficial microorganisms. Pests and diseases are some other reasons for the browning of the leaves. More importantly, you should make sure that you clean all of your garden tools, preferably sterilize them once they have been used before you use them again. The plant does not do well in bright sunlight, so filtered light is the best choice for the rhododendron. So, without further ado, let’s talk about a few reasons why the rhododendron leaves might turn brown or yellow. Otherwise, you need to water the soil. These nutrients are required by the plant to thrive and to maintain the quality blooms. And if the soil contains too much clay, it will cause waterlogging and drown the roots. The former is a naturally occurring phenomenon that takes place as the result of changing weather patterns and doesn't necessarily indicate a dead plant. So, without further ado, let’s talk about a few reasons why the rhododendron leaves might turn brown or yellow. Make sure to inspect the roots when planting the rhododendron seedlings in your garden or container. This is an easy issue to fix as you can protect the plant from the sunlight. This usually happens due to a number of reasons, primarily when the conditions required by the plant are not met. Another source of these diseases if from the soil so avoid splashing it. Many leaves on my rhododendron have turned brown. If the soil is too acidic or alkaline, the plant cannot circulate nutrients well and causes leave to brown. Your rhododendron leaves are turning brown because they may be suffering from scorched leaves. You can keep the seedling outdoors for 2-3 hours for the first couple of days. I recommend adding mulch near the base of your rhododendron plant.