Bamboo
Bamboo is a woody grass with narrow leaves.
Use the botanical sourceExtra care needed
Japanese knotweed.
Reynoutria japonica
Also found as Itadori
A highly invasive, bamboo-like plant whose young spring shoots taste like tart rhubarb.
Sources checked 27 September 2026 · Specialist field review pending
Before any gathering or use
Often sprayed with herbicide; ask the landowner. High in oxalate. Never move plant fragments, which regrow.
Where it grows
Tracked records and known growing zone
- Verified records
- 46,637
- People who recorded it
- 18,727
- Most records (northern hemisphere)
- Apr–May, Aug–Sep
- Records span
- 1979–2026
| January | 349 |
|---|---|
| February | 338 |
| March | 933 |
| April | 8078 |
| May | 8092 |
| June | 5475 |
| July | 4700 |
| August | 5750 |
| September | 6890 |
| October | 3996 |
| November | 1467 |
| December | 484 |
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
Hollow, jointed, bamboo-like stems speckled red-purple.
- 02
Broad, shield-shaped leaves on zigzag stems.
- 03
Sprays of small creamy flowers in late summer.
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.
Rhubarb
Rhubarb leaves are toxic; only its stalks are eaten.
Use the botanical sourceSelected comparisons only. Other lookalikes may occur locally.
03 / Meet the place
Habitat & season
Range context
Native to East Asia; invasive across Europe, North America and New Zealand.
Watch the plant stage
Young shoots in 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 shoot
Peel and cook young shoots under 30 cm like rhubarb.
Care for the patch
Legal controls apply in several countries; bag and destroy waste rather than composting.
Preparation & storage essentials05 / Follow the evidence
Sources & review
- Wikipedia · Reynoutria japonicaBotanical description, range and documented use
- iNaturalist · Reynoutria japonicaTaxonomy 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