1) The document analyzes niche-regime interactions in learning and innovation networks for sustainable agriculture across Europe. 2) It identifies five modes of interaction between niches and the mainstream agricultural regime: compatible, complementary, emergent, divergent, and oppositional. 3) The analysis finds transition to sustainable agriculture involves dynamic, diverse, and irregular interaction in the "fuzzy" space between niches and the regime, leading to a series of adaptive changes rather than a single regime change.