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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.

He started by attending a demonstration on lasagna mulching led by artist-in-residence and horticulturist Leigh Adams at the Los Angeles County Arboretum’s Crescent Farm.