I didn't realise that - what really keeps me from getting a tea bush, though, is the fact that a) I mostly drink black tea, and that would need fermenting; b) most of the black tea I drink is actually decaf; and c) care instructions say something about "needs a light and warm place the whole year round"... and things that don't survive winter in the wintergarden are more or less doomed here. Having an exploding 20 m high tree here, though, certainly is also a good argument against it!