My Stems are turning red

Hey guys, im a new grower and I am growing the PUPRLE#1 from dutch passion now and Im in3rd flowering week and I noticed that in the last 2 weeks the fan leaves stems are turning red/purple but the leaves are still green, someone knows what it might be ?

Cheers guys, peace !

Some types of weed it's common. You have to look out for other signs to be sure it's not magnesium or phosphate deficiency. That's your best bet if it is showing you problems

what was the name of that strain, case closed