Raymond makes his version of a rhubarb custard; Kate learns how vanilla became one of the world's most popular flavours.

Summer has arrived at Kew and everything in the garden is blooming.

With the on-set of autumn, the vegetable garden is set to produce a bumper harvest and Raymond and Kate prepare to cook up some fall favourites.

Winter is setting in, but some crops love the cold and Raymond learns how brassicas cope in this frosty season; Kate visits Kew's Millennium Seed Bank.