The gardener keeping Derek Jarman's visionary patch of shingle at Prospect Cottage alive

The artist, filmmaker and gay activist Derek Jarman only gardened at Prospect Cottage for eight years before his death in 1994. His partner Keith Collins kept Derek’s vision alive for 25 years, and now that role has passed to Keith’s friend – the writer and nurseryman Jonny Bruce. For the latest episode of How My Garden Grows, we travelled to Dungeness to meet Jonny and figure out why this inhospitable patch of shingle was on the right side of history …