What are the herbal remedies for anxiety are there?

My father is taking 2 mg of diazepam for feelings of anxiety, which only occur time to time. It does not take them all the time, only when you feel nervous and not in control. Are there any natural remedies out there that could not take place?

St. John's wort valerian kava kava root rhodiola Asian-cola

Herbal Plant Remedies : Herbs: Turmeric for Inflammation