I had a few of my outdoor plants go purple over winter, one was hands down the winner taste and flavor wise.
Was running 90 plants indoor so could not risk taking cuttings and bringing them in.
One thing I did notice from the purple girls is that they all finished up about 2 weeks faster than the ones that stayed green.
All seeds from the same flower.
Thats intresting mate!
Outdoors I use a strain I worked out myself its F12 now.
F1 cross was made indoors. From here everything went outdoors.
SensiStar x Black Domina is the genetics.
2/3 phenos are red-purple
Both green and purple take nearly the same time to finish.
What I observed is that the purple phenos handle cold and desease better than the green ones.
Quality is just the same as well as taste.
The stuff that makes plants purple ... I forgot the name cytocin or something like that its called is a kind of natural frost protector.
Why your purples have been earlier Idk.
But early in my part of the woods is good because we loose a lot here in wet septembers/oktobers so first week of september here is ideal outdoors.
Peace
Edit:
It seems to me there are two different genoms for the purple color.
- induced purple.... dependent to low temps
- independent always red/purple in every given temprange