Broad-leaved dock
Rumex obtusifolius has broader, flat leaves; used similarly.
Use the botanical sourceExtra care needed
Curly dock.
Rumex crispus
Also found as Yellow dock
A tall dock with long, wavy-edged leaves and rusty seed stalks that persist into winter.
Sources checked 27 September 2026 · Specialist field review pending
Before any gathering or use
High in oxalate; large amounts can harm the kidneys. Not for people with kidney stones.
Where it grows
Tracked records and known growing zone
- Verified records
- 30,882
- People who recorded it
- 14,520
- Most records (northern hemisphere)
- Apr–Jul
- Records span
- 1985–2026
| January | 479 |
|---|---|
| February | 520 |
| March | 1149 |
| April | 5126 |
| May | 4628 |
| June | 5590 |
| July | 4931 |
| August | 2496 |
| September | 1932 |
| October | 1045 |
| November | 715 |
| December | 492 |
| January | 177 |
|---|---|
| February | 129 |
| March | 116 |
| April | 206 |
| May | 128 |
| June | 67 |
| July | 43 |
| August | 99 |
| September | 156 |
| October | 227 |
| November | 236 |
| December | 195 |
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
Long, narrow leaves with strongly wavy, crisped margins.
- 02
Tall stalks of small green flowers that turn rusty brown in seed.
- 03
Yellow to orange taproot.
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.
Foxglove rosettes
Toxic · do not eatFoxglove leaves are softer and velvety; highly toxic.
Selected comparisons only. Other lookalikes may occur locally.
03 / Meet the place
Habitat & season
Range context
Native to Europe and Asia; naturalized nearly worldwide.
Watch the plant stage
Young leaves in early spring.
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: Young leaf · Root
Cook young leaves in changes of water. Roots have traditional medicinal use.
Care for the patch
Common in pasture and waste ground.
Preparation & storage essentials05 / Follow the evidence
Sources & review
- Wikipedia · Rumex crispusBotanical description, range and documented use
- iNaturalist · Rumex crispusTaxonomy 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