Insane Purpleness!! Help a fellow grower out!

So my plant has been turning more purple by the day. It's getting to the point that the leaves are so dark, they're almost black.

Supposedly it could be from the recent coldwave here in Switzerland.

This plant is a Swiss Alpine Rocket (Indica) and started flowering around the 20th of July, so for 5 weeks now. I'm being told that it has 3-4 more weeks ahead, and hope that it will survive until then.

Please give me your opinions on why the plant could have turned purple and whether or not it looks like a problem.

i know that some strains actually have purple leaves when they are flowering, but I am not sure this is one of em and know nothing else about why it could be that way... maybe someone else here will know more...

Either it's temps are lower than 60 or it's starving of phosphorus. I havent heard of any other reasons why purple would show up unless it naturally turns purple. If you dont like the purpleness I'll take it :D.

Cold weather-> degradation of chlorophyll -> purple anthocyanin pigment showing through.

Otherwise looks like it's healthy enough to make it to harvest! :D

Thanks for the positive feedback, now I can sleep again! :)