I can only rely on personal experience when a couple of years ago I was notified that seeds I had ordered from China had been confiscated by Australia Customs being told that they were a bio-security risk. further correspondence was ignored except to be told the seeds were incinerated. That is a fact Skeggley.
I didn’t say that wormwood from Australian stock was not permitted, if that is what you are referring to, which is a different matter to attempting to import plants here.