I do most things like Michelle when it comes to pots, except I use 2 gal pots 90% of the time because they will only be in the pots over winter then shipped in the spring. Anything thats going to stay here longer will go in the raised boxes in the display area or the hybridizing area.
I have did the pot in a pot thing in the past and it worked very well. I would use three gallon pots and start with two or three fans so they could stay in place a couple of years before the pots got to crowed and needed devided.
Mulch to hide the pots
Final results