The Irish Revival was, amongst other things, an attempt to ‘re-enchant’ the Irish natural world as both a protest against Anglicisation and Enlightenment values. Through a study of the poetry of a lesser-known Revivalist poet, Seumas O’Sullivan, who was a keen natural historian, and thus engaged with the popular discourses and practices of natural science in the period, this chapter discusses Revivalist nature poetry as a form of ‘re-enchantment’. In doing so, it also considers how engagement with natural history in the period effected a shift in the poetic relationship to materiality, considering the movement between Celtic Revival poetry and later Revivalist work in term of a closer attention to the physical world.