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Red stems


Shane247
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AFAIK there can be many reasons, ranging from 

 

general NPK

sulphur

mag

 

Which could be caused by:

 

overwatering

cold

pH

salt buildup

mixing nutes poorly

 

Sometimes a sign of stress. Could just be strain expression, though less likely when it's long streaks IMO. 

 

Would need to watch for other symptoms if one was to pin it to something specific.

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