About the Authors

Katie J. Field

Affiliation Animal and Plant Sciences, Western Bank, University of Sheffield, Sheffield, United Kingdom

Rachel George

Affiliation Animal and Plant Sciences, Western Bank, University of Sheffield, Sheffield, United Kingdom

Brian Fearn

Affiliation Abbey Brook Cactus Nursery, Matlock, Derbyshire, United Kingdom

W. Paul Quick

Affiliation Animal and Plant Sciences, Western Bank, University of Sheffield, Sheffield, United Kingdom

Matthew P. Davey

mpd39@cam.ac.uk

Affiliation Department of Plant Sciences, Downing Street, University of Cambridge, Cambridge, United Kingdom

Competing Interests

BF is the owner of the Abbey Brook Cactus Nursery, Derbyshire, United Kingdom (www.abbeybrookcacti.com). This does not alter the authors' adherence to all the PLOS ONE policies on sharing data and materials.

Author Contributions

Conceived and designed the experiments: KJF RG MPD. Performed the experiments: RG MPD KJF. Analyzed the data: KJF MPD. Contributed reagents/materials/analysis tools: BF PQ. Wrote the paper: KJF MPD.