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Why are the leaves on my gardenia going yellow?

I have 5 gardenias planted along a SW facing wall that gets afternoon sun and is well drained. I have feed them with blood and bone and dynamic lifter and they are well watered. However three of them have quite a few yellow leaves. Are they lacking some chemical?

Flowers and Ornamentals • Garden Jobs

Hi Anthony,

if it is older leaves yellowing it is perhaps a shortage of nitrogen, new leaves yellowing it could be iron, if all over then maybe magnesium. With the fertilisers you have used thay should not be lacking so I am thinking your pH is probably wrong. Suggest get a pH test kit from your nursery and make sure soil is in the acid range around pH 5.5 to 6.5. A fast acting liquid such as Aquasol Soluble Plant Food used occasionally will support the other 2 slow acting fertilisers.



Answered: 11 Jan, 2019

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