Please help ! Dark purple on outdoor plants

Hello everyone !! Hope everyone is have a a good grow outdoors the season. I’m looking for help identifying what this purple is on my outdoor plants. I will attach pictures. They are about 11 feet tall and 6-8 feet wide and in the ground in western Massachusetts They have been fed with foxfarms tiger bloom. They were planted in a 5 gallon hole with some home mixed promix and perlite and bone meal with couple other things also. I had no clue they would get as big as they did. So any help on this purple I’m seeing would be greatly appreciated!
Thanks for your time !

Pheno trait

I’m pretty sure that’s a good color.

It happens sometimes. Almost always, just a genetic trait of a strain.