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Stems Turning Purple

I would like to know why my bok choy and cilantro stems turn purple. It seem like they have hard time growing bigger. Is the soil too rich or too light? Is it too much or too little water? Thank you very much.

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1 Comment To "Stems Turning Purple"

#1 Comment By Nikki On 02/18/2014 @ 7:37 pm

It is caused by a phosphorous deficiency. Some bone meal will help correct it.

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