I was looking through some older newsgroups for some information about Giant Sequoia trees and found the following exchange:
[partially re-phrased by me]
Fanta : I have a giant sequoia, approx. 17 in tall (43 cm). That is
from the ground up, not including the roots. Currently it is in a pot.
My question is, how big should the pot be?
Starlord : You're looking at a tree that gets pretty big. You don't want
a pot, it would do better in a bowl. You should try and get a bowl about
the size of the Rose Bowl.