Grounded theory (GT) is a popular research methodology that has been used in various fields and disciplines. Its researchers face the paradox of their method being grounded in both data and theory, potentially resulting in researcher ambivalence towards existing knowledge and constructing “thin” or “descriptive” theory as a result. In this reflective paper, the researcher uses a case example of theorising the category “improvisation,” to explore the deliberate decolonial use of literature in GT. They share detailed examples of inductive coding, analytic memoing and abduction of the category. They describe a paradigm‐changing moment of realisation when they discovered their own colonial thinking towards this category and the subsequent perspective change that occurred when they attempted to “de‐link” from their colonial thinking and apply a decolonialised lens to their category. The work of Black and Indigenous authors enabled the researcher to theorise “improvisation” as a valid, transdisciplinary practice that lies at the heart of both therapy and art making. The researcher concludes that researchers intending to decolonialise their knowledge production should take a critical‐reflexive stance towards existing theory, deliberately seeking out alternate, decolonial ways of knowing, in order to construct more vital, convivial and emancipatory theories. They also offer a decolonial reimagining of therapy as a grounded, responsive, intentional and social improvisational practice, which is co‐created between client and therapist.