Pennyroyal
Toxic · do not eatPennyroyal has small leaves and whorled flower clusters; toxic in concentrated forms.
Culinary reference
Water mint.
Mentha aquatica
Also found as Marsh mint
A streamside mint with rounded lilac flower heads and a strong peppermint scent; parent of peppermint.
Sources checked 27 September 2026 · Specialist field review pending
Before any gathering or use
Wash well; wild water can carry liver fluke and other parasites. Avoid pennyroyal confusion.
Where it grows
Tracked records and known growing zone
- Verified records
- 10,000
- People who recorded it
- 4,941
- Most records (northern hemisphere)
- Aug–Sep
- Records span
- 1971–2026
| January | 11 |
|---|---|
| February | 28 |
| March | 99 |
| April | 563 |
| May | 522 |
| June | 323 |
| July | 1412 |
| August | 4204 |
| September | 2000 |
| October | 510 |
| November | 80 |
| December | 30 |
Research-grade iNaturalist records, snapshot Aug 27, 2026. The growing zone combines areas where different people have repeatedly verified it. Records show where people looked and found it, not current abundance or permission to gather.
01 / Learn to see
Field marks
- 01
Square stems with opposite, oval, toothed leaves, often purplish.
- 02
Rounded lilac flower heads at stem tips.
- 03
Strong minty smell when crushed.
These are study prompts, not a complete identification key. Confirm the full plant with a regional flora and an experienced local identifier.
02 / Resolve the differences
Look closely. Compare.
Hemlock water dropwort
Toxic · do not eatGrows in the same wet ground; deadly.
Selected comparisons only. Other lookalikes may occur locally.
03 / Meet the place
Habitat & season
Range context
Native to Europe, northwestern Africa and southwestern Asia.
Watch the plant stage
Leaves spring to autumn; flowers late summer.
Stage guidance is not a local forecast. Check your climate, elevation and a regional source; no month-shift formula is used here.
04 / Gather with care
Documented use & care
Parts discussed: Leaf · Flowering top
Use leaves fresh or dried for tea and cooking.
Care for the patch
Cut tops and leave the rooting stems.
Preparation & storage essentials05 / Follow the evidence
Sources & review
- Wikipedia · Mentha aquaticaBotanical description, range and documented use
- iNaturalist · Mentha aquaticaTaxonomy and verified observation records
Checked 27 September 2026. Original editorial synthesis; source institutions have not reviewed or endorsed this guide. Independent botanical field review is pending. Photos illustrate specimens; they do not certify the identity of a plant you find.
Suggest a correction