This paper investigates the emergence and development of horizontal ties between educational innovators, their role in disseminating educational innovations and maintaining grassroots dynamism in the educational system. Though the significance of horizontal ties in innovative economies is highlighted in earlier studies, the findings of their impact on educational innovation outputs are not definite. Taking into account a strong centralising tendency in the Russian educational system, this research question seems to be of high relevance. Employing empirical data and qualitative analysis we built a coherent model of the collaborations and partnerships that provide resources, knowledge, promotion and informational support for innovative projects in education. As a main result, we identified formats of innovators' horizontal ties in the educational sphere and the difference between the effects of internal and external ties. The analysis showed that the conception of explorative and exploitative learning is relevant to the educational system and allows researchers to explain a range of patterns. Furthermore, we argue that under resource constraints, educational innovators take on new roles related to fundraising educational initiatives, creating active communities and supportive expert groups.