over the past few weeks i have noticed that the stems on my plants are turning from light green to dark purple. I am wondering if this is something to be concerned about and/or what i can do to fix it.

well some pics would help. i would assume that if they started turning purple after they were green its possible that its just the strain. unless your leaves start changing i wouldnt worry about it.

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"Make the most of the hemp seed, sow it everywhere." - George Washington

Pictures would be helpful. Also details as to where you are into your cycle. Best of luck.

purple stems/branches is typical of one of two things: (a) strain genetics (b) stress
either way post some pics

mine are doing it also, just curious