Star Anise is a seed pod from an Asian tree. Not something you'll want to grow. Too much space, time, and it's not Hardy.
Burdock root adds a nice smoothness to root beer and you can grow it yourself. Wintergreen is another ingredient that I like in root beer. A few drops of wintergreen oil in a 5 gallon batch is plenty so it's easier to just buy it. Although you can probably grow it if you want.
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