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I have a gardenia gifted to me 18 months ago that I am struggling to achieve consistent good health with. I have rotated between Kahoona and Osmocote for gardenias etc over appropriate intervals, I had good flowers but continually suffer poor leaf health on and off. I know the culprit is likely to be magnesium or iron, but do not know. Hoping someone with better knowledge than me can tell me what I should try. Thanks
