[zpyro]

I've seen plants grown in a perpetual harvest setup that way. The youngest plants were in the middle, oldest on the outsides.

If doing a SCROG, you might want to use clones because if you end up with males/hermies it will be a huge PITA to remove them from the screen, especially if you don't notice it before they start releasing pollen. If that happens you'll get all kinds of seeds.