Jack fruit tree is a tree known for the largest tree born fruit in the world. Jack fruit tree grows in the tropical lowlands. Fruits are large and globose multiple fruit covered with thorny tubercles. Unripe fruits can be cooked. The seeds may be baked or boiled. Amongst a number of varieties of jackfruits, the honey-jack (muttan varikka or varikka) is considered the sweetest. The flesh of the jackfruit is fibrous and starchy. It is a source of dietary-fibre. Jack fruit tree is used in the treatment of skin diseases, diarrhea, urinary retention, wound, fever and general weakness. The timber of the tree is used for making furniture.
Ammachi Plavu, the name of Jack fruit tree in the Sree Krishna Swamy Temple at Neyyattinkara near Thiruvananthapuram, is connected with the life of Marthanda Varma, the founder of Modern Travancore. It is believed that he escaped from the enemies by hiding in the hollow of the Ammachi Plavu.