Has Johnny Appleseed ever interacted with other DC Universe characters?

Yes, Johnny Appleseed has occasionally interacted with other DC characters, typically those connected to nature or the mystical. He has had encounters with Green Lantern (particularly those relating to environmental threats), Swamp Thing (due to their shared connection to the natural world), and characters associated with magical or mystical forces within the DC Universe. These interactions often involve him offering assistance or warnings about ecological dangers.