Christina has now completed her AHRC-funded CDA PhD in the Department of Geography, RHUL, and at RBG Kew. Her research focuses on the cultural history of the arboretum using RBG Kew as a case study (from 1759 to 1939), exploring the themes of landscape, place, collections, botanical networks, and the histories of science and horticulture on site.

This research is mainly archival, based at RBG Kew as well as other garden and arboretum archives in the UK, US and elsewhere. She developed a version of object biography for this research based around living trees called Tree Biographies (see Plant Perspectives 2.2, 2025), to better explore how individual trees have had agency in shaping the landscape and the purpose of this botanical collection. Viewing trees as embodied history, agents of landscape change, and markers of social and scientific history has been key to her research.

She also successfully revealed the historic hidden voices of the workforce of Kew in a social history of education and labour in the arboretum, through researching memoirs, correspondence, and work journals, looking at historic tools and practices. Exploring the gardeners' relationship with landscape, botany and plant collecting has offered key new insights into the history of an arboretum that is both local and global. In her discussions of the 'global' at Kew her thesis analysed data regarding the global network of 'Kewites' of this period, as well as Kew's partnership with the Arnold Arboretum in the US, and how the oak collection at Kew was brought together and now represents a large proportion of the world's Quercus species.