The tree gang, headed by Jon Hammerton, deal with a diseased tree, while in the Palm house, keeper Emma Fox is on the attack against a plague of thrips. Outside, preparations for a giant badger sett are also underway.

Displays co-ordinator Phil Griffiths prepares the mighty titan arum for its moment of glory, watched eagerly by Kew's expert in foul smells, Dr Geoffrey Kite. Elsewhere the team put the final touches to the Go Wild festival and the tree gang deal with a giant bamboo emergency in the Palm House.

It's all hands on deck as the biggest planting of the year gets underway. Sarah Smith and her team have just four days to transform the Palm House border. The tree gang help out with a project at a local school and the Orangery hosts its annual charity auction.

The world's leading expert of Madagascan palms, John Dransfield is on the hunt for an exotic palm that's facing extinction, while Steve Ketley, Keeper of the fern collection has some giant moth coccoons to find a home for. Elsewhere Emma Fox is coaxing the giant waterlily into growth.

It's a nail-biting time as Head of Horticulture Nigel Taylor waits for news about UNESCO World Heritage status for the gardens and Emma Fox taks on the role of a nocturnal beetle to pollinate the giant water lilies. Beneath the Palm House Pete Morris dons his waders to restock the marine display.

Arboretum manager Ray Townsend and his team are hard at work irrigating the gardens during the hottest summer for years, while arboretum head Tony Kirkham travels to Italy to search for matching pairs of mature trees for the Pagoda vista.

The tree team are called to the Palm House to tackle a tree that is giving cause for concern. Ray Townsend travels to Japan to collect specimens and Tony Kirkham uses the old-fashioned methods of harvesting wheat, and with a bit of help, makes his own loaf of bread.

A small Japanese island is the destination for Ray Townsend as he attempts to bring back a record breaking number of seeds. Phil Griffiths has a lucky day when he discover a large tree trunk that is perfect for one of his displays in the Princess of Wales Greenhouse.

Ray Townsend meets a fellow bamboo expert while asking for directions in Japan, while back at the gardens Phil Griffiths creates a stunning display of pumpkins and gourds. In one of the galleries a scholarship student is displaying her botanical artwork

The curator of the Millennium Seed Bank, Stuart Cable, travels to Madagascar to collect seeds from endangered species and Sarah Smith and Emma Gardner delve into the past when an archaeological dig begins at Kew Palace. Randall Keynes the great-great-grandson of Charles Darwin pays a visit to the gardens in search of a rare rhododendron.

A fault is detected in the heating system for the Palm and Waterlilly houses, putting the exotic specimens in the Waterlily house at risk. Tony Kirkham plants the new trees that have arrived from Italy and Stuart Cable continues his seed collecting trip in Madagascar

As the seasons turn full circle, the tree gang gears up for the spring. Tony Hall gives the new students advice on replanting islands in the lake and there is great excitement as the world's oldest pot plant is about to produce a cone.