Peppermint.

This may be grown on any damp or marshy soil, and increased by dividing the roots.

Related posts:

1. Mentha Rotundifloria Variegata (Variegated Mint).
2. Omphalodes Verna.
3. Vaccineum Myrtillus and V. Uliginosum.
4. Artemisia Villarsii.
5. Heleniums.