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Conservatories and greenhouses, similarly, can get too hot unless shading is provided, Guy Barter, the Royal Horticultural Society's chief horticulturist, told the BBC.

For instance, even before construction began in 2022, the project built a nursery and sent horticulturists combing the hills around the site to collect about 1 million seeds from around 30 native plant species.

Sussex horticulturist Roger Parsons hopes it is still growing in a garden somewhere.

The horticulturist and broadcaster, 69, said the increasing frequency of flooding in the UK was "proving to be a much bigger problem than drought".

"I don't think any of us expected it to be the next kiwi at Kroger," said Kirk Pomper, a horticulturist and research lead of Kentucky State University's pawpaw research program.