Purple/red stems

[†ù®Ké¥ š†ûƒƒïñg]

This is my second grow, the first oen was indoor. Now, I decided to go outdoor since its getting warmer outside. My plants are only 1 and a half old and they have decent size fat leaves with a second set comign in. But, soem of thier stems are purpleish or redish. What does this mean? I'm sure it's not a nute defciency. It got to 50's this week, is it cuased by cold? But, it's wamred up since then shouldn't it go away? Also, my plants accidently got watered two days ago yesterday and today on accident and I think there over wated becuase the leaves are curving down a little, will they be ok?

[2cesarewild]

Most likely it's the cold, if your plants for some reason can't uptake their N could be another reason, but you say you got nutes covered, and cold can cause purple... Just let the leaves return to normal looking, they'll be fine. It's called weed remember, shit is pretty versatile in terms of dealing with environment, the plant is so strong.