| Scientific Name: | Mentha cervina |
| Common Name: | water spearmint, Hart's pennyroyal |
| Family Name: | Lamiaceae |
| Origin: | Europe |
| Hardiness Zone: | Zone 4: (-34 to -29 °C) |
| Plant Type: | Herbaceous perennial |
| Mature Size: | 0.2 - 0.4m x 0.3 - 0.6m (height x width) |
| Habit: | Upright |
| Form: | Irregular |
| Texture: | Medium - fine |
| Landscape Uses: | Aquatic - ponds, Attract beneficial insects, Herb |
| Exposure: | Full sun only if soil kept moist |
| Soil or Media: | Bog |
| Leaves: | Simple, Opposite, Sessile, Soft flexible, Pinnate venation, Glabrous, Distinctive smell, Linear, Oblanceolate, Entire |
| Flowers: | Verticillaster, White, Blue, Violet, Jul-Aug-Sep |
| Fruit: | Schizocarp, Green, Brown, Oct-Nov |
| Key ID Features: | |
| Leaves sessile, opposite, linear-oblanceolate, 1-4cm long x 1-3mm wide, margin entire or with a few rounded teeth on each side, spearmint smell; flowers forming globular clusters at peduncle nodes. | |