They form PNG's second biggest language group. Other languages are spoken in Simbu's eastern and southern areas. Tok Pisin is the main second language. Simbus are known for their gardening ability. They have developed ways of draining and enriching soil that help them grow food on the same steep hillside year after year, and at higher altitudes than in neighbouring provinces.
Sweet potatoes are the staple except along the southern border.
Sago is dominant there. Simbu people also grow many fruits and vegetables. Pigs are the main meat, eaten mostly at ceremonial feasts. Most edible wild animals have been killed in the heavily populated areas. Simbu cultural centres are located at Ku and Kerowagi.