hmm, your temps are perfect. i wouldn't worry about it too much unless it starts to affect the health of the plant. I had the same thing on my last grow, but it was due to low temperature, nothing bad came from it
amstron Reviewed by amstron on . What to do about reddish-purple leaf stems? The plants seem to be gowing well and are relatively healthy, but as of this week, some of the new growth has reddish/purple stems. What should I do to correct this problem? Your advice is appreciated! Rating: 5