When you plant them, dig in plenty of Rhododendrons encounter diseases, fungi, and climatic issues that can result in brown spots, or even entirely brown leaves. If decreasing temperatures aren't the culprit, attention should be turned toward the plant soil. alkaline, if it's not alkaline naturally. The potted azalea also needs fertilizers like any other plant. the water to wet and penetrate the peat. Without being able to see the damage up close, I am speculating that It may be due to winter injury which can be caused by several environmental factors. exception is ericaceous compost. Are you sure that you can't collect some rainwater in a container ~not necessarily a water butt? The infected parts are invaded with brown spots that expand and spread from the leaves and to the stems to infect the established rhododendron leaves. then that would be a help. The plant is about 7 feet tall and 6 feet in diameter. Prolonged saturation leads to diseases that kill an entire plant, not just its leaves. Cause Leaf scorch on rhododendrons is a response to stress. Without being able to see the damage up close, I am speculating that It may be due to winter injury which can be caused by several environmental factors. Remember they like acid conditions, and most general Arlene, ello Cuz, glad that you are finding your way around GOY sorry taken so long to reply on here, not been on for a few days.... mmmmm you know what i have had something very simular on 2 of my Rhodo's, and like yourself have others growing around it that look fine... the one in the front garden has had it, had to dig it out and dispose the one in the back seems to have picked up ok... i am thinking one of two things wronge with mine.... 1) virus 2) too much sun.... in my front garden it gets it all day... and i think the brown splotches i had were proberly due to scorching... this may sound obvious but what time of day do you water Andy? I wouldn't use tap water at all if you can help it and what ratio white vinegar did you use? Newly planted rhodies should be watered in well, and will require more organic matter such as leafmould, compost from your own heap or peat Mountain laurel and azalea are also attacked. that are suffering stress due to drought will show it by wilting, but What causes it? Dieback is caused in rhododendrons by Botryosphaeria dothidea and in azaleas usually by members of the Phomopsis genus. The leaves may turn brown due to nutrient deficiency, such as a lack of magnesium and iron. Many things can cause rhododendron leaves to turn brown. Occasionally I use Miracle-Gro soluble plant food for ericaceous plants, say once a fortnight. You might not be able to save your plant if the poisoning is too much. The site gets sun from about 2pm onwards in high summer, otherwise is shaded. It is not uncommon to see this happen on rhodies here in Central Oregon. Spots on rhododendron leaves. On the watering front I rely on rain but in a few drier spells I have used tap water with some vinegar added to it (I read this was a good thing to do???). With the humid summers here in SC, I always seem to have at least one Rhododendron with this problem. I planted two rhododendrons in May in a raised bed, next to each other. The … Note: the other rhododendron, which is planted in the same soil about 1 metre away, is doing fine, so it can't be the soil acidity can it? damage the surface roots. Is there anything I can do to prevent it? The stresses triggered by unfavorable weather can cause: Browning on the tips of leaves; Browning along the margins of leaves; Extended browning and crispy leaves; Curled leaves crust that sheds water and stops it reaching the roots. My rhododendrons have brown edges on the leaves. This could happen due to the hot sun or cold winter winds. to let the rhodie roots breathe. Add another photo hot, dry weather I would water at least every ten days. or the alpine garden using the sprinkler we obviously use tap water and have never had a problem. foliage in the evenings is also a good idea, especially if the soil 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. are in the pot when you get them, and after planting give them a good Location also plays a role with winter moisture and water use. attention in their first season than well-established rhodies. May 8, 2015 | Gardens. Remember to use acid Unfortunately it will just be brown for the duration of the winter. water, preferably rainwater as tap water is often treated to make it •Rhododendron Wilt: Also known as Phytophthorn root rot, this soil borne fungal disease is most common in locations where the soil is frequently wet. Waterlogged roots suffocate and shut down, leaving no avenue to replace water lost to drying winds and sunlight. Plants die rapidly. The two primary reasons that rhododendron leaves turn brown are cold weather and rhododendron wilt. This will help retain moisture in the If you see your rhododendron leaves turning yellow, review each and every element of the plant’s care. Brown Rhododendron Leaves. Part or all of the plants may be affected. ideally you should get them watered before that happens. In this case foliage in the evenings is also a good idea, especially if the soil. Best offers for your Garden - https://amzn.to/2InnD0w ----- Brown Leaves on Rhododendron. wide (5 cm), elegantly darker freckled. A fungus called phytophthera takes hold if the roots are in overly damp conditions. The most common symptom of winter injury in rhododendrons/azaleas is leaves turning brown. Thank you. hot, dry weather I would water at least every ten days. But our water comes from bore holes near the river Spey and is only lightly treated. If we have to water the veggies. Rhodies do need plenty of water, especially in hot dry weather and 2 – Powdery Mildew. Water stress can occur under both extremes of flooded, overly-saturated soils or under drought conditions when too little water is present. Poor drainage and overwatering are common causes of browning leaves and stems. Infested branches become weakened and may break off. glossy green leaves and bountiful blooms. Grows on You is a community for gardeners. I suspect they did not get enough water when we had the two week heat wave. Usually the injury is due to winter desiccation where the plant dries out as it cannot access any water from the frozen ground. However, the soil mix is comprised of quite gravelly soil, which was there originally, mixed with lots of ericaceous compost before planting.