purple stem

hi peeps my plant is a lemon kush 2 weeks old the thing its gone a purple colour done the stem i think its due to leting it go dry due to being at mums when im on shift work the plant looks like its wilting a bit aswell i'v replanted in coco medium and started the nuntes its not due to the nuntes as it was the same before hand can someone help me to do the best for it the plant is under a 300watt 9u cfl blub and in a 7 foot walldrode i have fresh air pumping in plz help sorry about the pic's its from my phone..

Check the ph. Thats where I always start.

Maybe its my eyes but im not seeing much of purple there, not sure I would know what it was anyways. Sorry, Good Luck!

Could be strain related, could be too much nutes, could be temps.
What are your temps, and how much did you feed?
Plant looks nice and healthy, I wouldn't worry about it.

Need more info, man. Ph?Your leaves look decent, but it could be your lights not giving the true color.
Take a shot of the leaves with your flash, when the lights are off.