There are many ayurverdic herbs but the 31 listed below is specific for hair growth.
#Fact: Some believe that the top 3 ayurvedic herbs are Bhringarj, Brahmi and Amalaki (Amla); but some say Henna is up there too. I say the herbs that work for your own individual hair needs can be characterized as the best. Also they are many more ayurvedic herbs, pls. click here
Caution: It is said that both neem oil and fenugreek oil are not good for pregnant women, I am not a doctor so please check with your doctors.