A GodfatherOG, Brownie scout, and a mystery seed I got from a seed bank, as a thanks for being a customer. All 3are 10 days away from harvest.

Plants look great

Hey man… a question, how do you know with detail and accuracy that there are 10 days left until harvest?

The breeder provides an approximate indication of the flowering duration. Towards the end of that, when all the pistils change color, one observes the trichomes. Based on the color of the trichomes, one can then estimate when the desired ripeness level is reached.