Week 1: They all sprouted and mostly look healthy. One has oddly shaped leaves. I watered once, about .5-1 liter spread around the 4 plants. Then I left for 3 days and I just got back. I have gradually increased the light intensity. The light is at about 45% power and it is 45cm from the plants. So far, so good!
Looking good, I need to get to the point where i can say "2 more weeks" confidently. Its more of a guessing game with the plants I've grown so far as there has never been enough really clear trichome changes, even harder to see on these purple varieties.
@eurorack, Thanks a lot! Just because I can say it confidently doesn't mean I'm right ;) There are other factors that also let me know that the plants are almost ready. They start to drink less water than before. Some of the fan leaves fade yellow/purple and some fall off. The pistils curl and darken. And the trichomes change as you mentioned.