A strange plant popped up in my pot. It's about a metre and a half tall, skinny and has yellow green leaves which tastes minty, is serrated. It never flowered but has seeds on it too which also taste minty. I took a few bites but it has no side effects except leaving a fresh minty taste in my mouth. Is it edible? Can you help identify this plant. Perhaps it's dropped into my pot by a bird.