The Landscape Man television show - which will launch on 22 April at 8pm - was originally set to air in autumn 2009 but delayed due to Channel 4 budget decisions.
The book of the same name, written to accompany the series, was published last month.
Matthew Wilson - who was RHS head of creative development but left in October to join the Landscape Agency as its landscape director - presents the show.
It follows six amateur garden teams as they embark on garden makeover projects over the course of a year.
Matthew Wilson told HW he was "really looking forward" to the show finally airing, but added it was "quite scary".
"Until now we have made something we are all terribly proud of, but no one else has judged it yet," he explained.
The show airs just a few days after Wilson and his wife, Jane, celebrte the first birthday of their twins on 16 April.
Wilson has been filming a second series with development funding from Channel 4 and hopes it will air in 2011. Following the same format as the first series, it covers six garden projects over a period of 10 months.
"It is a good mix of places, people and styles of garden, from Scotland and Ireland to Lincolnshire," revealed Wilson.