at what temp does marijuana start turming purple

any ideas?

If its not a purple strain only the leaves will turn purple. Around 40 degrees

doesnt happen to all strains but most will get cool leaf colors anyway. from low 30s-high 30s is the temp range. any less then freezing for too long will kill them

I think its around 40's farenheight thats when I star noticing it going on around here. But I have no clue about an exact temp.

my plants turned purple and my grow room only gets down to 65 maybe 60

the actual buds or just the leaves@dude above?

I am almost positive that the buds will only turn purple if it is in the genetics. Cold temps will only bring on dark colored leaves, but some strains will have the leaves turn purple regardless of temps like the plant in avatar