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Photinia Red Robin yellowing

One of my Red Robins is going yellow, I am guessing it is lacking in something (iron perhaps?) what can I do please.
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https://www.rhs.org.uk/prevention-protection/nutrient-deficiencies
https://smile.amazon.co.uk/Chempak-Sequestered-Iron-250g/dp/B00M48LGKO/ref=sr_1_12?crid=1YFX4OG1PIVF6&keywords=sequestered+iron+plant+food&qid=1648108424&sprefix=sequest%2Caps%2C119&sr=8-12
but anything similar with Iron/magnesium and manganese should do the trick
Billericay - Essex
Knowledge is knowing that a tomato is a fruit.
Wisdom is not putting it in a fruit salad.
1 application a year in the Spring should be all that's needed, but it can be used more frequently.
Seaweed extract would provide some of the same stuff but much less concentrated, it would still help though.
Billericay - Essex
Knowledge is knowing that a tomato is a fruit.
Wisdom is not putting it in a fruit salad.