"Gardening Naturally" is (maybe was) an institution, having been started and kept going by John Dromgoole for some 40 years, until his own retirement. It was a pioneering show for years, and the larger market finally started to catch up with it.
I was a consistent listener for much of that time. I recall JD "auditioned" successor hosts over a period of time, so as to hand off the show to the most appropriate person, in his judgment. Jeff Ferris was a fine choice; he had some big shoes to fill!
My opinion is that Jeff Ferris would have preferred to also hand off the show to a like-minded successor, to continue the tradition, as it were, in an orderly fashion, but for some reason matters did not unfold in that way. Maybe someday we'll know what happened. For the present, it's not at all clear to me we'll continue to have 3 full hours of gardening advice every weekend morning.