The Temperate House at Kew Gardens was due to shut because of its deteriorating state. However, multi-million pound grants from the Heritage Lottery Fund, Department for Environment, Food and Rural Affairs and private donations means a five-year restoration scheme can now go ahead.
The 150 year-old Grade 1 listed building is home to the South African Cycad and the Chilean Wine Palm, the world's tallest glasshouse plant.
Martin Stew spoke to the Head of Glasshouses at Kew Gardens, Greg Redwood.
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Before the final declaration on Friday, the Conservative candidate looked set to lose the City Hall race to Labour's Sadiq Khan.
The Tooting MP has been the frontrunner in the counting process ahead of Tory challenger Zac Goldsmith.
It's not just London where elections have been taking place today. There were council elections taking place across the home counties.