I have a lovely ficus and I would like to plant it in one of those giant
chinese urns, about 3 feet high,

don't plant it in anything that doesn't have a drain hole.

Iris,
Central NY, Zone 5a, Sunset Zone 40
"If we see light at the end of the tunnel, It's the light of the oncoming
train."
Robert Lowell (1917-1977)