Calmag?

Pictures of the entire plant but those leaves look plant needs a good feeding.
I thought it also could be from being in direct sunlight on outdoor plants too..my biggest one had crazy looking striped purple steady I figure it is stressed it's been hot as hell most days..my other smaller ones seem healthier and have green stems tho ..
 
I thought it also could be from being in direct sunlight on outdoor plants too..my biggest one had crazy looking striped purple steady I figure it is stressed it's been hot as hell most days..my other smaller ones seem healthier and have green stems tho ..
Striped purple sounds like possible magnesium deficiency. But again better pictures help.
 
my comment was made to separate the purple on the leaves from the branches and main stem, it could be nothing but if there is a problem with your plant the leave stems are not going to tell you, the branches and main stem may. Purple can happen for many 'no problem' reasons, the best you can usually do is ensure your plant is as healthy as possible before you go chasing something without knowing it's an issue.. Something that can help us all better answer you is a picture of the entire plant and let us know your feed routine

www.royalqueenseeds.com/us/blog-should-you-worry-about-purple-or-red-cannabis-stems-n1311
 
A nice dose of balanced feed and add a nice dose of calmag. Epsom salt is ok but it has no calcium, just magnesium and sulfur.
 
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