1 = innocuous and boring
2 = somewhat interesting
3 = useful with no dangerous qualities
4 = useful but might have some unpleasant side effects
5 = useful but use with caution
6 = useful but considered dangerous
7 = somewhat useful but highly dangerous
8 = somewhat useful but could kill you if you're not careful
9 = no uses found and dangerous to be in proximity
10 = you are dead if you touch, inhale or are within 6 inches of this plant