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How do I stop the leaves on my rhododendrons turning yellow?

Our Advice:

You can use acidifying products such as Yellow Sulphur from Vitax or Sulphur Soil from Greenacres Direct. If you are in a hard water area, any water you apply can be treated with vinegar to acidify it. Add 1 tablespoon of vinegar into 1 gallon of water to soften it and mix it in well before watering your plants.

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