Bloom said he was sure his late father Alan would have win the award and said the Norfolk garden he left as his "legacy" was still going strong. Adrian's son Jason runs the nursery which is "much smaller than it was but much more satisfying too".
He said Peter Seabrook, Roy Lancaster and himself were in a generation of "lucky ones" to work during the "post-war interest in gardening - a tremendous thing to be involved in".
Bloom added: "At the moment it's increasingly under pressure - but we need to continue to inspire, one of the ways to continue to get people into horticulture and gardening".
He said: "I will continue to do that as long as I am able." Bloom gave an open invitation for GMG guests to visit his Bressingham garden, adding that many people say they have been, but that was "20 years ago".
He said: "Gardens grow and things change, although I have been slated occasionally by the media for conifers, they're still there!"
Clare Foggett replaced Deborah Stone as GMG chair. Barbara Segall and Veronica Peerless stepped down too.