Any tourist who is interested in flora and in knowing about various species of plants has to surely visit the orchidarium and the green house in the Botanical garden. Yercaud is the place where the famous Kurinji flower blooms in plenty and the specialty of this flower is that it will bloom only once in twelve years.
The National Orchidarium which is located 2 km from the Emerald Lake has a wide variety of orchids which includes 30 orchid species that are exclusively found here. Many endangered species of orchids are persevered in this orchidarium which is ranked the third largest of all the orchidariums in India.
Besides Kurinji, Vernonia shevaroyensis and lady's slipper orchid are among the others on display here.