I remember about 10 years there was a current affair program said that Australian custom should change the rule to allow people to bring in 花旗參, whether this rule has been changed I don't know. 花旗參 has a special term not just american ginseng.
The fact that it is not on the 擁帶物品紙 does not mean a thing. For it is herbal product so according to the 擁帶物品紙 you must declare it, then the custom will look at it and decide whether it is allowed to bring into the country or not. You should email the custom for clarification:
[email protected]
寄去澳洲 - you still have to declare what you send. The custom may scan it or even open it. Even if it is allowed to import, you may need to pay tax for large quantity.