Why do rhododendrons turn yellow

Iron deficiencies are best cured by adding a seaweed and iron mixture to help restore the original foliage. Seaweed stimulates plant growth and the iron added to these products helps to give the rhododendrons the nutrients they need in the manner that they need it.

You should be using Rhododendron fertiliser on an annual basis which is a type of organic fertiliser that breaks down slowly, releasing the proper amount of nutrients at the proper times. After flowering, you can give your plants additional fertilisers and it will help encourage vigorous growth and flowers the Following season.

Having seaweed and sequestered iron additives mixed with regular fertiliser can help your Rhododendron foliage if you already have neutral or acidic soil. Adding the essential nutrients once the supply has been exhausted will correct just about any issue your Rhododendron is having which is the good news.

Issues with drainage can be tackled by transplantation as can issues with improper soil, you could also choose to improve the drainage by adding lots of organic matter and grit into the soil. Problems with nutrient absorption or hard water can be properly tackled by way of seaweed and iron mixtures as well as regular Rhododendron fertilisers.

Read our detailed guide on growing rhododendrons which covers everything from planting to pests and diseases to watch out for. Welcome to my site, my name is John and I have been lucky enough to work in horticultural nurseries for over 15 years in the UK. A: So many possibilities! Second, they need very acidic soil. Third, they typically need fertilization on a regular basis. A yellowing of the leaves is usually an indication that the plant lacks an adequate supply of nitrogen. Fourth, your plants may have an infestation of the azalea lace bug, which you can detect by examining the underside of the leaf to see if there are small black spots, which are the droppings of the insect.

Finally, your plant may have a root infection of some sort there are several prospects. I would suggest that you begin with a soil test for pH soil acidity and nutrients in the area near their root balls.

Be sure to tell them you want to improve the soil for rhododendrons, so they can give you advice specific to that species. Then follow their directions for soil amendments. Second, I suggest you read the following article on the care of rhododendrons, so you can understand their needs : Azalea and Rhododendron Care and Culture.

If you check the leaves and find no droppings, you can check that off your list. Nutria can consume up to 25 pounds of food a day. Oregonian file photo. Q: Any suggestions for landscape plants that nutria will not eat that can be used in a city park adjacent to an irrigation ditch? A: The bad news is that nutria will browse most trees, even the bark of trees and shrubs. Aromatic herbs are less desired. If put in low moisture, the plant may turn its leaves yellow. A common cause for leaf yellowing in the Rhododendrons is fungal infections or pest attack.

If you notice yellow patches or blotches on your plant, it may be diseased or infested by spider mites. Lumpy, drooping leaves are mostly a result of overwatering.

Please remove your Rhododendron plant from its current soil, wash its roots thoroughly, and pot into a well-draining container. Furthermore, add some fungicide spray to the plant. Yellowing and leaf curling in Rhododendrons can occur due to various reasons. Moreover, ensure that it is placed in dappled sunlight. When your Rhododendron plant grows leggy, stretched vines, you may have to repot it.

Transfer the plant into a slightly bigger pot with good drainage and aeration. Marcel runs the place around here. Marcel is also the founder of Iseli International Commerce, a sole proprietorship company that publishes a variety of websites and online magazines. Philodendron Majesty Care — Best Secrets! Common Causes of Yellowing of the Rhododendron Plant Leaves When it comes to growing the Rhododendron plants, they are mostly hassle-free; however, occasionally, the plant may create some problems for the owner.

Some common causes for Rhododendron plants leaf yellowing include the following: Imbalanced Soil pH The Rhododendron plants are generally tolerant; however, they are quick to react when their soil pH rises above normal.

The symptoms to look for are complete curled in leaves hanging very limp and they are usually brittle to touch. Sometimes the whole plant can be affected and by the time it is discovered, it will be too late to save the plant. Other times only one branch may be affected and this should then be pruned off and burnt.

The fungicide Alliette is the product that should then be sprayed over the foliage to reduce the risk of the fungus spreading further.

It is not a good policy to replant a rhododendron in a spot where one has already died, if phytopthora is suspected as being the cause of death. Do not spread soil from this area into other areas of your garden. Wash all tools after working in this area. Remember phytopthora only attacks the odd plant and by maintaining good drainage and sanitation you lessen the likelihood of this disease occurring.