United Kingdom, Oct. 20 -- King Charles has secretly recorded a podcast episode with Cate Blanchett.

Unearthed: The Need For Seeds features Oscar-winning actress Blanchett, 56, and the 76-year-old monarch, as well as Dr. Elinor Breman of the Royal Botanic Gardens, Kew, talking about the Millennium Seed Bank.

The globally famous seed bank - opened by King Charles in 2000 and managed by Royal Botanic Gardens, Kew - serves a vital role in preserving nature, and strives to protect plant species from being lost to climate change and environmental threats.

In the 22-minute podcast episode - which was recorded in Windsor, Berkshire, South West England, in July - Cate said: "There is an urgency to the work that the seed bank does.

"I was shoc...