In the village of Jongowe in the Zanzibar archipelago, women are the guardians of extensive agricultural knowledge. Yet male authority circumscribes this feminine sphere in the form of ritual and scientific "experts." Annual planting is dependent on the advice and goodwill of genies, spiritual beings who are ritually summoned, celebrated in song and dance (ngoma), and formally consulted by elder male ritual leaders. At the same time, a male government extension agent has introduced agricultural extension programs that bring new planting calendars, farming techniques, and seed varieties to the village. Through these male ritual and scientific authority figures, ecological knowledge in the village is controlled, classified, and contested. However, recent challenges to local land use have cast new light on the ordering of agricultural knowledge. I suggest that although the control of knowledge and resources in Jongowe may be most obviously understood through an idiom of gender, the most important epistemological distinctions in this community may lie elsewhere. [traditional knowledge, agriculture, gender, ngoma, Zanzibar] bs_bs_banner Culture, Agriculture, Food and Environment Vol. 35, Issue 2 pp. 102-111, ISSN 2153-9553, eISSN 2153-9561.