black on buds and leaves

Hi can someone help me with what this is? at first it was on a plant or two and now it seems to be on many of them. Both on the leaves and on the buds...
 

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interesting - its definitely not below 60 at night - I'm in the north east. Is there anything I should give them? Thanks for the help
 
It is a P lockout, caused usually by an excess within the plant and cooler temps. Flush the plant throughly and reapply nutes with your next watering. this is an easy fix so don't worry, usually caused by feeding to high of P in your NPK and not enough K. K is needed in near equal parts of P in order that the plant can process the P correctly.
Good Luck to you
 
yeah i thought it was a purple strain at first - last year i had 1 of maybe 10 that was purple. the thing is they all look really good and healthy they just are turning purple - there isnt any mold and they are not squishy at all... i would say of the 15 plants 8 have the purple on them. hmmm... i got the seeds from a friend who collected them over a year - i guess i should check with him to see where they came from was purple... ok thanks a bunch
 
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