In the early 20th century the sandy zone along the coast was nearly barren, but the more elevated region behind the coast with broken surfaces and sandy soil produced fruit and most tropical products when conditions were favourable. The natural vegetable production was important, and included manigoba or Ceará rubber, carnahuba wax and fibre, cashew wine and ipecacuanha. The principal agricultural products were cotton, coffee, sugar, manioc and tropical fruits. The production of cotton increased largely with the development of cotton manufacture in Brazil.