Biju Narayanan follows multi-level and high-density farming for exotic fruits like durian and longan in Kannur. He retails rambutan at ₹300 per kg and mangosteen at ₹400 per kg besides providing farming consultation, agritourism, and nursery services. The engineer turned agripreneur now cultivates 95 acres of land in three districts of Kerala under the Ulikkal Agrofarms brand.