This article is about the pedagogical potentials and challenges of co-drawing in science education. It builds on video data from three primary school classrooms where students worked in pairs to draw some science content on a shared paper. Grounded in a sociomaterialist approach, we analyse how students, drawing tools, paper templates, visual resources, and science concepts collaborate during drawing activities. Our findings reveal that even though two students share a paper they do not necessarily negotiate their understandings of the science content they are asked to draw. For example, one student may shape a verbal and visual narrative about the science content with little input from the other, or negotiations may focus more on drawing techniques and composition than on understanding the science content. However, the article identifies a promising scenario in terms of science learning opportunities, when both students draw within a confined space on the paper. In such cases, it seems that science learning emerge while drawing and that both students are involved in a joint learning process.