I had spearmint, peppermint, chocolate mint and pineapple mint growing next to each other. I only planted these four years ago. They all grew nicely the first year. The second year I found it hard to tell chocolate mint and peppermint apart, but I assumed some of each still survived. Last year the pineapple mint was so swamped by the spearmint that I could only find one little plant. I rescued it and grew it in a pot all summer and then planted it in its own spot. The main mint bed consisted of peppermint and spearmint warring on each other last year. This year the spearmint came up but I can't find any peppermint/chocolate mint. Either it was swallowed by the spearmint or its just late sprouting.
So I am the only person who has killed or nearly killed mint. Does anyone have a recipe for lemon balm? That is flourishing mightily.