Hello, if a rhododendron is full of buds and well established and has been fine for about 8 years but this year the leaves look pale green around the edges would you use Sulphate of Iron or a controlled release ericaceous fertiliser such as Miracle Gro?
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http://gardenprofessors.com/phosphate-toxicity-and-iron-deficiency/
feed with iron. Note in the text how phosphate should be avoided...