Zach Galifianakis stars in the Netflix series 'This Is a Gardening Show.' RadicalMedia/Netflix Zach Galifianakis is very understanding when, as he explains what he's planted in his garden this spring, I trip over the difference between perennials and annuals. "The language is totally off," he says. "That's why I just call perennials forever plants." The forever plants in question - hardy kiwi, rhubarb, asparagus - are part of the actor's effort to court more bees to his property.