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Before you take action, are you sure its a magnesium deficiency? Purple stems and yellow lower leaves can be caused by other things as well.
well thats what im most sure it is. if not what do you think it is?
We'll need more info.
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It's not necessarily magnesium; nitrogen, phosphorus, and pottasium deficiencies can all cause the purple stems and yellowing lower leaves you're seeing as well. Can you provide pics and some more info?