Yarbadosi schreef
I don't think it's illegal because I have seen it once growing in an
ornamental in the UK.

+ + +
Newsflash: the fact that it is not illegal in the UK has no bearing on the
question if it is illegal in Australia. The worldwide introduction of US-law
everywhere is still some time off.

Also the fact that a plant grows somewhere does not mean it is legal (cf
Cannabis, which is grown in quite a few spots)
PvR