Does the countdown to harvest start when the buds form or when you change to 12/12. I mean if you change to 12/12 on say Nov 9 do you harvest around end Jan. This is sativa. Thanks
When counting days of flowering begin at the start of the 12/12 light cycle. Don't harvest based on a calendar, get a pocket microscope or jeweler's loupe and examine the trichs to see when the plant is ready.