Newb getting ready for flower

Why are all my stems this color? Should I be concerned?

Could be genetics or phosphorus deficiency. Almost looks like a citter hole in the left stem bottom picture

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I agree with Hornhead. Did you see any red.purple stems when they were seedlings or in early veg?

do you know the strain u planted? could be natural.

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Leaves are a bit yellow. Couldn’t find it on the chart, but this may help.