Igor,
Most of those pots are 16" across the top. There are seven of them, they are the different varieties of cuttings I kept from last year. I plan on going bigger, but hoping at least some of them will stay in those pots for this year. The next step up is the 24" from HD. I know I'll likely move the Falcon up to a 24" or one of the bigger clay pots in the other picture. The middle tree in the other picture is Petit Negra (RT), which I'll be moving up to a bigger final clay pot in the next month. I prefer clay, but I've decided to only put the trees I know I am keeping for sure in them, save alot of work and money for a bit anyway. This summer I'll have to get that heavy duty hand cart from Global Industries with the 24" folding nose extension, I'm going to build a sort-of V-shaped box out of plywood to serve as a spacer to keep the pot and tree away from the cart.