In this week's programme we visit a brand new hotbed of horticultural research in the UK: RHS Hilltop – The home of gardening science. In the heart of RHS Garden Wisley, this state-of-the-art facility will house groundbreaking research into problems affecting real-life gardens, and offer visitors unique insights.

We meet award-winning designer Ann-Marie Powell who talks us through the stunning spaces surrounding the building, featuring an array of edibles and wildlife-friendly planting. Plus our resident history maven Fiona Davison shares the story of how Wisley ended up at the forefront of gardening science over a century ago.