In the Beechgrove Garden, Carole and George have a tough job of taste testing the new super-sweet tomatoes and thin-skinned cucumbers in the tender veg polytunnel. Jim visits Glasgow Botanic Gardens - now in their 200th year of existence - to see how the new young gardeners of Glasgow are being trained through a unique apprenticeship scheme. George is in his horticultural element as he visits Rosa Steppanova in Lea Garden at Tresta on Shetland. This extraordinary garden is 12 hours and 200 miles by sea from Beechgrove, and yet it is an astounding display of plants from all around the world.