The pot is Chinese about 18" by 12" or so. Not a real expensive one, but gets the job done. The "sword cut corners" are the reason I got it--that and it's quite shallow which work pretty well with forests. It hasn't spalled like other Chinese pots I've had. Seems to be quite frost resistant, as it's been left out in temps below 10 F for a few years. Can't remember where I got it, though--it was a while ago. The trees are about 15 years old, from pencil thin (and thinner) whips I got from Bill Valavanis.
I've got to repot this forest and another amur forest. These things break in growth in mid-Feb, so repotting them can be a challenge. Freezing your butt off with frozen soil in the snow is a drag.
I will try to get some photos of scrolls soon.