Aim. The focus of this study is on the perspective of facilitators of evidence-based aged care in long-term care (LTC) homes about the factors that influence the outcome of their efforts to encourage nursing staff use of best practice knowledge. Design. Critical incident technique was used to examine facilitators' experiences. Methods. Thirty-four participants submitted critical incident stories about their facilitation experiences through face-to-face interviews, telephone interviews, and/or a web-based written questionnaire. The resultant 123 stories were analysed using an inductive qualitative approach. Results. Factors at individual and contextual levels impacted the success of facilitators' work. The approaches and traits of facilitators as well as the emotionality and intellectual capacity of nursing staff were the individual factors of influence. On a contextual level, the inherent leadership, culture, and workload demands within LTC homes, as well as externally imposed standards were influential. Conclusions. Primary factors influencing the facilitation of best aged care in LTC homes appear to be largely relational in nature and intimately connected to the emotionality of those who work within these settings. Enhancing the interactional patterns amongst staff and leaders as well as promoting a positive emotional climate may be particularly effective in promoting better aged care nursing practice. © 2009 Blackwell Publishing Ltd.