The Q&A Archives: Shrubs Yellowing

Question: I have several green leaved shrub plants outside and now some of the leaves are turning yellow.

My neighbor says they need iron, what do you think?

And will a treatment of miraclegro give them all they need?

Answer: Some plants will yellow as a sign of needing iron, but usually the problem is more complicated than that and has to do with the soil pH being ill-suited to the plants you are trying to grow. There are other possible reasons for plants to yellow, including over watering and herbicide drift, as well as other soil imbalances. You might wish to take a sample to your County Extension (690-2655) for a more specific diagnosis of the problem, and while you are there, see if they will help you with some basic soil tests and interpreting the results. Unfortunately, although fertility may be part of the problem, without soil tests you have no way of knowing what will really take care of it.

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