How much american ginseng can i bring in?

I have 10 lbs of American (Wisconsin) ginseng and was hoping to purchase about 5-10 more pounds. I purchased these in bulk from American farmer, and they are to be for 1 lb. gifts to my future in-laws (father-, mother-, sisters, aunts and uncles). Do I need to pay any taxes or duties on these. I will pack in freezer bags and label for each person with their name (in English).