Melissa officinalis
This mint is said to uplift the spirits and calm the heart. I have found that to be true, making its minty lemony flavor an essential component of my herb garden for winter tea mixes, water infusions, and various summer dishes. Its blooms are a magnet for pollinators and beneficial insects.
It is a tender perennial that benefits from being planted in a protected micro-climate. In cold climate areas for instance, plant it against a rock or wall.