Doonesbury by Garry Trudeau for May 12, 1975
Mike: Hey, has anybody here seen Zonker? Plants: Yeah - he and Patty the potted palm split for Hartford this morning. Mike: Hartford?!! What for? Plants: Oh, she's attending some dumb house plant convention! Zonker went as her chaperon. Mike: What?! Plant: Okay, she'll be staying in greenhouse three! Zonker: You be good now, hear? Plant: I'm so excited!