Doonesbury by Garry Trudeau for May 19, 1972
Nichole: Isn't it amazing how much Zonker's become involved with his garden? Mike: It certainly is. I must say, I'm very surprised... Nichole: You know he spends all day out there with his brussels sprouts and aprika plants. Mike: And especially with his wheat patch! You won't believe what he does to his wheat patch every day! Nichole: Try me. Zonker: 'Morning, wheat patch! Time for our shampoo!