Agriculture supported about 80 % of the population and supplied about 96 % of exports in the early 1990s. Two agricultural zones are generally defined: the coastal area, which ranges in elevation from sea level to 400 meters and which supports cash crops such as vanilla, ylang-ylang, and cloves; and the highlands, which support cultivation of crops for domestic consumption, such as cassava, bananas, rain rice, and sweet potatoes. As the population increased, food grown for domestic use met fewer and fewer of Comorans' needs. Data collected by the World Bank showed that food production per capita fell about 12 % from 1980 to 1987. The republic imported virtually all its meat and vegetables; rice imports alone often accounted for up to 30 % of the value of all imports.

Comoros is the world's principal producer of ylang-ylang essence, an essence derived from the flowers of a tree originally brought from Indonesia that is used in manufacturing perfumes and soaps. Ylang-ylang essence is a major component of Chanel No. 5, the popular scent for women. The republic is the world's second largest producer of vanilla, after Madagascar. Cloves are also an valuable cash crop. A total of 237 tons of vanilla was exported in 1991, at a price of about CF19 per kilogram. A total of 2,750 tons of cloves was exported in 1991, at a price of CF397 per kilogram. That year forty-three tons of ylang-ylang essence were exported at a price of about CF23,000 per kilogram. The production of all three commodities fluctuates wildly, mainly in response to changes in global demand and natural disasters such as cyclones. Profits--and therefore, government receipts-- likewise skyrocket and plummet, wreaking havoc with government efforts to predict revenues and plan expenditures.A a system of the EC, provides aid to Comoros and other developing countries to mitigate the effects of fluctuations in the prices of export commodities.

Since the latter part of the 1980s, Comoros has made headway in developing fisheries as a source of export earnings. In 1988 the government concluded a three-year agreement with the EC by which forty French and Spanish vessels would be permitted to fish in Comoran waters, primarily for tuna. In return, Comoros would obtain ECU300,000, and ECU50,000 would be in unconditional in fisheries research. In addition, fishing vessel operators would pay ECU20 per ton of tuna netted. Although the deep waters outside the islands' reefs do not abound in fish, it has been around that up to 30,000 tons of fish could be taken per year from Comoran waters which extend 320 km offshore. The total catch in 1990 was 5,500 tons. Japan has also provided aid to the fishing industry. Fisheries development is overseen by a state agency, the Development Company for Small-Scale Fisheries of Comoros.