Zanzibar and its surrounding islands are also known as the Spice Isles. Curiously, this is a wholly imported conception, as there was no real concentration of spices growing here until the Arabs and the Portuguese came and planted spice and fruit varieties they had encountered on their travels around the world. Everything seems to grow on Zanzibar, and so now the farmers grow peppercorn from India, lemongrass from Southeast Asia, avocado from Peru, cloves from Indonesia, and vanilla from South America. In essence, the ecosystem of Zanzibar changed completely with the settlement of the Portuguese.
And yes, cloves come from red flowers on a tree and peppercorn grow on a vine. Cardamom comes from overground root-like pods produced after flowering, and pineapple takes 6 months to mature (and one can only harvest one fruit per plant per year). All of these, as well as cinnamon, turmeric, and other spices are now an integral part of the Swahili diet and kitchen. I would love to know what food tasted like before the Portuguese came.
(Zanzibar, Tanzania; August 2017)