“Good day from Kamakura, Japan,” a warm, soothing voice says, welcoming you into a verdant world on screen.

The voice, honed by five decades in broadcast journalism, belongs to Robert Jefferson, a semiretired news writer and announcer at NHK. For the past seven years, though, he has been offering a different kind of reportage, crafting a distinctive persona as on YouTube.

With his canine co-host Haru beside him, Jefferson has produced, shot and edited several hundred videos for his channel. In weekly half-hour episodes, Jefferson centers his show on the mountainside garden that he shares with viewers around the world.