When my elderly neighbor passed away, the new buyers of the home gave me what they thought were peppermint plants growing in their lawn. I replanted them in my lawn, and they're pretty invasive. As the original planter has passed away..I have no idea if they truly are peppermint.
They grow pretty close to my lemon balm and I don't want them to cross-pollinate, so I yank them out of the ground before they flower.
I was thinking of potting them up and moving them elsewhere and growing them for tea. However , if they are pennyroyal I don't want to serve them to anyone pregnant (pennyroyal is an abortificant)
How do you tell the difference BEFORE they flower?