Temperate House will welcome visitors to experience the “brand-new splendour” of the iconic building after its entire framework was repaired and thousands of glass panes replaced.
The project, supported by the National Lottery , led to 500 plants being taken out and housed in a temporary nursery, with a staggering 10,000 going back in by the reopening next May.
While retaining its Victorian aesthetics, the house will “embody cutting-edge engineering techniques” and is expected to be a “vital, forward-facing beacon of contemporary plant education".
Richard Barley, director of horticulture at RBG Kew, spoke about the “lengthy and delicate” restoration to Kew Gardens' "most incredible" building.
“A few weeks ago, I watched as some of the world's rarest plants were moved, with the utmost care, into the Temperate House,” he said.
“It was a seminal moment, kicking off the countdown to May's reopening of what has to be Kew Gardens' most incredible building."
Mr Barley added: “Temperate House will be for everyone – from young to old, for budding gardeners or aspiring artists, for those making a pilgrimage from great distances, and for our local community.
“When our first visitors first swing open the doors, they will find these plants encased in a glistening cathedral, the new glass allowing the sun to stream in, the ironwork restored to its glossy best.”
Temperate House, which was first built in 1863, will be home to 1,500 species of some of the world's rarest and most threatened plants.
After the restoration, Temperate House will “tell the stories of plants that Kew has rescued” and the journeys taken to reach the sanctuary of their new home.
A visitor might find the Dombeya mauritiana plant, almost extinct in the wild until one was found growing in the Mauritian highlands.
On top of that, Kew Gardens visitors could find themselves encountering Taxus wallichiana, exploited for the Taxol market - a chemotherapy drug - in Nepal.
A programme of interactive events and artistic entertainment, running throughout next summer and designed for the whole family, intends to “bring the stories of these plants to life”.
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