In the Beechgrove Garden, Jim is attempting to turn yellow into green as he tackles the lawn, which has turned a washed-out yellow after all the rains of winter. And continuing the theme of upgrading the 20-year-old Beechgrove Garden, Jim takes on an unloved corner of the low-maintenance garden, removing a rotting fence and pruning a wayward quince. Brian Cunningham visits the Royal Botanic Garden in Edinburgh, which is home to one of the most impressive alpine collections in the world, for inspiration as to how to recreate that in miniature back in Beechgrove.