There is a growing evidence that 'biophilia' (Depledge, Stone and Bird, 2011) is an important aspect of human experience. There is a commensurate recognition by many schools (and educators) of the importance of natural environments for the wellbeing and cognitive development of children, particularly in the 21st century context of high-stakes testing, parental concerns about safety, and legal constraints upon children's adventurous play. However, my early research in this area suggests that pre-service teachers commence university study with a 'nature lag': many have limited experience of learning and playing in natural environments. There are implications here for their future practice - and perhaps also for their personal understandings of the world.