I agree with Dutch Pimp. I have never had a grow, that the entire crop was ready at the same time. Not even on accident. I gave-up trying years ago. But like he said, tiz a good way to get to know your strains.

My indica doms, I let go till the first signs of rusty trichomes appear. Good night-time couchlock. More difficult to function in a social setting, but great for severe mellowing-out. More of a sedative effect.

My sativa doms, I harvest those slow-pokes when 90% or so of trichs are cloudy. A lighter buzz allowing social interaction without the forgetting of your name. More of a "wow...look at the lights" kind of effect.