Mr Horrell was away when the 15 other winners received their awards in September.
"If the world was full of John Horrells, what a magic place it would be," Mr Carter said.
Mr Horrell said he was almost embarrassed to receive the award because he was just one member of a dedicated team.
Among the Rotarians, gardeners and dog lovers present at the ceremony was Mr Sansom's cousin Tony Edgar of Pt Wells, near Warkworth.
Mr Sansom originally farmed further down Inlet Rd but bought the land, Mr Edgar's parents' farm, when he retired, setting part of it aside to pursue his dream.
"There's a lot of good memories here," Mr Edgar said.
Mr Horrell and fellow Rotarian John Graham are NZ Gardener Magazine's gardeners of the Year for their work at Roland's Wood.