I have been there. Very cozy environment and friendly people there. The herbal products are sold at an affordable price !
TKC Herbal Nursery is Tropical Herbal Farm with about 500 or more herbs planted. The area is about 30 acres (12 hectares). It is open to the public 7 days a week including public holidays from 9.30 am to 5.00 pm.
There is no charge for entrance.