When should I begin to flush?

Hey! I would say now is the time to start, get to it.. they look great!! 👏👏 Heres a little bit more info that could interest you.. Harvest window opens when you start getting amber pistils(hairs). Normally when there's 70% amber and 30% white pistils they're ready to start flushing but that's not always the case. The best way to check is looking at the trichomes. Clear trichomes haven't reached their full potencial, cloudy ones are full of THC and amber are losing THC while gaining CBN. So depending on your preference whether you want more of a head high or body high. I normally start to look at trichomes when there are about 50/50% white and amber pistils. I harvest when after examining and finding 70% cloudy trichomes and 30% amber trichomes. For me that's a prefect combination, depending on the strain as well. Have in mind if you use nutrients you'll need to flush the roots, watering only with PHed water for at least a week. I normally start flushing when after examining I find an 80-90% cloudy trichomes. Good luck and happy growing!