Natural Genetic Colouration (Not a Problem)
Many flowering varieties express purple, red, or pink pigmentation in the last 2 weeks of flowering - this is completely normal and indicates anthocyanin expression triggered by night temperatures dropping.
What usually causes it
- Genetic trait
- Slightly cooler night temperatures encouraging colour expression
Walk the questions if you are not sure this is the match. The notes above are the same ones the tool ends on.