Framed by decolonial theory, this paper explores how language and literacy ideologies, including Anglonormativity, or the expectation that children should be proficient in a standardised version of English and are deficient if not, shape language and literacy practices in South African classrooms. While not legitimised, the use of fluid language practices in classroom discourse in the Global South is well documented. Less explored is the impact of language ideologies on children's written text production. Using the tools of linguistic ethnography, I focus on the literacy practices emergent bilingual children are engaged with in a Natural Science lesson in year 4, the first year of their transition from 'home language' language of instruction (LOI) to monolingual English LOI. A close analysis of the practice of learners making notes in the lesson shows a pretextual gap between the expectations of the activity: that the children will be proficient in the 'English' used for note-making as well as orthography and layout conventions of written notes, and the heterographic writing they are able to produce. I examine the written products of note-making against a contested history of the use of African languages for writing fiction, and the exclusion of African languages from formal education, thus within a context of coloniality of language. I argue that the concept of "ukuzilanda" can inspire the expansion of literacies in African languages in education, enabling us to build from an existing literate and oral tradition.