Ajwain is almost similar to cumin seeds, grown in central, northwestern, western and eastern states of India.
Ajwain, also known as bishops weed, grows to a height of up to 90 cm with thick foliage. The fruits bear single seeds, which becomes the part usable as the spice. The seeds are separated from fruits by crushing them under feet or by hand.
Use of Ajwain as a spice is not common in south India. Certain Bengali preparations in North India and some preparation from Arabic world uses this spice.
The seeds are valued as Ayurvedic medicines because of its tonic properties. The seeds can ease asthma and digestive problems. It is also used in the treatment of diarrhea, cough etc.