Broome will use her hour to raise awareness of Kew's Millennium Seed Bank partnership and its global conservation work.
Her slot of the plinth comes two weeks ahead of Kew's MSB partnership celebrating a milestone in its 10-year history when Kew will announce that the conservation project has collected, banked and conserved 10 per cent of the world's 250,000 wild flowering plant species.
Broome said: "When I entered I didn't think there was a chance that I would get selected. I never win raffles — so it is awesome that ‘my turn to win' came up when they were picking plinthers.
"A few months ago I was hired as a fundraiser for Kew. Though I knew a lot about the different work they do - beyond what you see in the Gardens — I really didn't quite understand the importance and global impact of their work. So I hope that my time on the plinth can help to raise more awareness of Kew's global conservation work - particularly Kew's Millennium Seed Bank partnership.
"The vital diversity of plants is under enormous threat — and we need plants. They give us air, food, shelter, medicine, help to combat climate change, and are an intrinsic part of the ecosystem.
"By supporting Kew's Millennium Seed Bank, you can help to save a plant species. The seeds we conserve now may give future generations the options they will need to mitigate against and adapt to the threat of climate change."
Subscribe to Horticulture Week for more news, more in-depth features and more technical and market info.