I buy all my stuff in big buds, like whole colas. I take what i need for the day, grind it up, bag it up and then i just dip into it during the day, saves time.

I dont see what harm it could do to gind it all up and then save it, or pick from it every now and agian. I guess it's easier and quicker.

But if you get large amounts and then grind em up and collect the kief, you can make a nice bit of hash aswell, then you can choose what to smoke. Green or solid.