Concerns about food security are growing around the world, precipitated by climate change, resource degradation, a growing population and increasing income disparity. In India, food insecurity is high in many rural farming communities, especially among isolated tribal populations. In this study we examine how knowledge about sustainable food production is acquired and mobilized among small-scale farmers belonging to the Malayalis Tribe, who reside in the Kolli Hills region of Tamil Nadu, India. We focus on nutrition gardening and fish farming, two production practices recently introduced to alleviate poverty and malnutrition in the region. Using qualitative participatory research methods, we explored ways in which farmers are accessing, using and sharing knowledge about these practices, and barriers to equitable access. We also asked farmers what information is still lacking about these practices and what mechanisms could be put in place to improve access. This research revealed that participants in both nutrition gardening and fish farming rely primarily on external experts (non-governmental agricultural research and extension) for formal training (e.g. workshops) and advice, despite a long history and traditional knowledge of gardening and river fishing. Agricultural knowledge is also mobilized within the region less formally between individuals and households through face-to-face contact or verbal communication via mobile phones. The use of additional communication technologies (e.g. computers) to enhance access and mobilization of knowledge was perceived to be most relevant and beneficial for young, educated people.