“Rest now old friend. See you in the sweet bye and bye,” the emotional presenter added.
Twitter users headed straight to the comments section with messages of condolence.
“I was one of Nigel’s besotted viewers.” one user said, before adding: “Everyone will miss him, he was such a character, sending love to you and your family, hug Neil tight tonight.”
On Instagram, the gardener added: “To the end he was happy, healthy and his usual calm, lovely self.”