I grew out a pack of PE a while back, took clones from them all and selected a Mother to keep. My mom is a ativa leaning pheno, wreaks of lemon mixed fruit smell. I noticed some purpling in my pheno this summer.
Im a caregiver in Maine, gets very cold here in winter. so I tried to see how purple it can get w/ cold. I took a mature plant at 60 days flowering and left it in a dark closet in my cold garage for 72 hours. The fans leaves that were purple turned a very dark purple, almost black. The flowers themselves had purple on the inside as well as the outside, not tons but some purple. .....The cold just brings the purple out more
Im thinking theres some purple in the genetics somewhere,I get some purple even in the warm summer. Much more with colder air in the winter