Harnessing the potential of wikis in teacher education is a significantly challenging task. Researchers suggest that incorporating wikis in the educational process requires a proper design rationale. This paper extends the previous research scope by proposing a wiki-based framework for organising collaborative Learning Design (LD) activities in teacher education. Aiming to exploit wiki's functionalities to foster collaborative LD tasks, cultivate LD knowledge and promote collaborative learning behaviour, the innovation of the particular framework stands in two elements. The first one is setting a blended learning context organised around five stages by adapting Salmon's model to gradually familiarise student teachers with wiki functionality, collaboration, and the LD process. The second one involves balancing individual and collaborative tasks through the five stages to cultivate trust and promote work-sharing among groups of student teachers. The proposed framework's effectiveness has been explored in an empirical study conducted in a professional graduate diploma in education offered by a Greek Higher Education Institution. Following a convergent mixed-method research design, we collected quantitative and qualitative data such as the preservice teachers' perceptions gathered through a survey questionnaire, the wiki logs and the wiki pages developed. Initial evidence is promising for the proposed framework's potential to effectively utilise a wiki for collaborative LD and LD knowledge development. Also, a quite welcome finding regarding the potential of the proposed framework is the well-accepted collaborative writing among preservice teachers showing their commitment to author their learning designs and revise the content created by their peers.