Pollinator plant

waterpepper

Persicaria hydropiper

Pollinator recipe
Sign in to use recipes

Common names

43 names · 28 languages
EnglishYour language
+5 more namesShow fewer names
Other languages (27)
Dutch
French
Arabic
  • بطباط فلفل المستنقع[4]
  • فلفل الماء[4]
Chinese (Simplified)
Chinese (Traditional)
Czech
  • rdesno peprník[4]
Danish
  • Bidende pileurt[4]
Estonian
  • mõru kirburohi[4]
Finnish
  • Katkeratatar[4]
Galician
German
+3 more namesShow fewer names
Hungarian
  • Borsos keserűfű[4]
Italian
Japanese
  • ヤナギタデ[4]
Japanese (romanized)
  • Yanagi-tade[4]
Korean
Latvian
  • Ūdenspipars[4]
Lithuanian
  • Kartusis rūgtis[4]
Nahuatl
Norwegian
  • vasspepper[4]
Polish
  • Rdest ostrogorzki[4]
Russian
  • Горец перечный[4]
Slovak
  • horčiak pieprový[4]
Swedish
  • bitterpilört[4]
Turkish
Ukrainian
  • Гірчак перцевий[4]
Welsh
  • Y dinboeth[4]
Sources & name notes (4)

Names recorded in our plant catalogue and botanical sources, grouped by language. Usage can vary by region.

Catalogue language labels are reviewed separately from botanical source records.

Numbered references identify names recorded by an external source. Other names are from our plant catalogue.

[1] Persicaria hydropiper — Plant Toolbox common names ↗

NC State Extension Gardener Plant Toolbox; English common names in a United States horticultural reference.

Source records
  • Marshpepper knotweed — ul#common_names > li:nth-of-type(1); heading: Common Name(s):; Persicaria hydropiper.
  • Smartweed — ul#common_names > li:nth-of-type(2); heading: Common Name(s):; Persicaria hydropiper.
  • Water-pepper — ul#common_names > li:nth-of-type(3); heading: Common Name(s):; Persicaria hydropiper.
[2] Persicaria hydropiper — iNaturalist taxon names ↗

Community-curated iNaturalist taxonomy. This is a common-name attestation, not an independent botanical determination.

Source records
  • marshpepper knotweed — results[1].names[2]; taxon id 78452; Persicaria hydropiper.
  • Flohpfeffer — results[1].names[12]; taxon id 78452; Persicaria hydropiper.
  • Pfefferknöterich — results[1].names[13]; taxon id 78452; Persicaria hydropiper.
  • Pfefferkraut — results[1].names[14]; taxon id 78452; Persicaria hydropiper.
  • Scharfkraut — results[1].names[15]; taxon id 78452; Persicaria hydropiper.
  • Wasserpfeffer — results[1].names[11]; taxon id 78452; Persicaria hydropiper.
  • Marsh-Pepper Smartweed — results[1].names[31]; taxon id 78452; Persicaria hydropiper.
  • marshpepper smartweed — results[1].names[40]; taxon id 78452; Persicaria hydropiper.
  • water pepper — results[1].names[5]; taxon id 78452; Persicaria hydropiper.
  • Water-Pepper — results[1].names[32]; taxon id 78452; Persicaria hydropiper.
  • water-pepper smartweed — results[1].names[39]; taxon id 78452; Persicaria hydropiper.
  • waterpepper — results[1].names[1]; taxon id 78452; Persicaria hydropiper.
  • Renouée poivre d'eau — results[1].names[4]; taxon id 78452; Persicaria hydropiper.
  • Poligono pepe d'acqua — results[1].names[38]; taxon id 78452; Persicaria hydropiper.
  • Waterpeper — results[1].names[10]; taxon id 78452; Persicaria hydropiper.
[3] Catalogue of Life 2026-08-20 — Persicaria hydropiper ↗

Common names from World Plants, version 26.05, reproduced in Catalogue of Life 2026-08-20. License: CC BY.

Source records
  • Marshpepper knotweed (EN) — VernacularName.tsv, line 150079; taxon 4F9T2.
  • Wasserpfeffer (DE) — VernacularName.tsv, line 150081; taxon 4F9T2.
  • Water-Pepper — VernacularName.tsv, line 150082; taxon 4F9T2.
  • Pfeffer-Knöterich — VernacularName.tsv, line 150080; taxon 4F9T2.
[4] Persicaria hydropiper — iNaturalist taxon names ↗

Community-curated iNaturalist taxonomy; common-name attestation, not an independent botanical determination.

Source records
  • marshpepper knotweed — results[15].names[2]; taxon id 78452; Persicaria hydropiper.
  • Flohpfeffer — results[15].names[12]; taxon id 78452; Persicaria hydropiper.
  • Pfefferknöterich — results[15].names[13]; taxon id 78452; Persicaria hydropiper.
  • Pfefferkraut — results[15].names[14]; taxon id 78452; Persicaria hydropiper.
  • Scharfkraut — results[15].names[15]; taxon id 78452; Persicaria hydropiper.
  • Wasserpfeffer — results[15].names[11]; taxon id 78452; Persicaria hydropiper.
  • Marsh-Pepper Smartweed — results[15].names[31]; taxon id 78452; Persicaria hydropiper.
  • marshpepper smartweed — results[15].names[40]; taxon id 78452; Persicaria hydropiper.
  • water pepper — results[15].names[5]; taxon id 78452; Persicaria hydropiper.
  • Water-Pepper — results[15].names[32]; taxon id 78452; Persicaria hydropiper.
  • water-pepper smartweed — results[15].names[39]; taxon id 78452; Persicaria hydropiper.
  • waterpepper — results[15].names[1]; taxon id 78452; Persicaria hydropiper.
  • Renouée poivre d'eau — results[15].names[4]; taxon id 78452; Persicaria hydropiper.
  • Poligono pepe d'acqua — results[15].names[38]; taxon id 78452; Persicaria hydropiper.
  • Waterpeper — results[15].names[10]; taxon id 78452; Persicaria hydropiper.
  • āchilin — results[15].names[6]; taxon id 78452; Persicaria hydropiper.
  • rdesno peprník — results[15].names[7]; taxon id 78452; Persicaria hydropiper.
  • 水蓼 — results[15].names[8]; taxon id 78452; Persicaria hydropiper.
  • Bidende pileurt — results[15].names[9]; taxon id 78452; Persicaria hydropiper.
  • Горец перечный — results[15].names[16]; taxon id 78452; Persicaria hydropiper.
  • Yanagi-tade — results[15].names[17]; taxon id 78452; Persicaria hydropiper.
  • Katkeratatar — results[15].names[18]; taxon id 78452; Persicaria hydropiper.
  • vasspepper — results[15].names[19]; taxon id 78452; Persicaria hydropiper.
  • Kartusis rūgtis — results[15].names[20]; taxon id 78452; Persicaria hydropiper.
  • Rdest ostrogorzki — results[15].names[21]; taxon id 78452; Persicaria hydropiper.
  • فلفل الماء — results[15].names[22]; taxon id 78452; Persicaria hydropiper.
  • بطباط فلفل المستنقع — results[15].names[23]; taxon id 78452; Persicaria hydropiper.
  • 水蓼 — results[15].names[24]; taxon id 78452; Persicaria hydropiper.
  • 辣蓼 — results[15].names[25]; taxon id 78452; Persicaria hydropiper.
  • ヤナギタデ — results[15].names[26]; taxon id 78452; Persicaria hydropiper.
  • bitterpilört — results[15].names[27]; taxon id 78452; Persicaria hydropiper.
  • 辣蓼 — results[15].names[28]; taxon id 78452; Persicaria hydropiper.
  • 여뀌 — results[15].names[29]; taxon id 78452; Persicaria hydropiper.
  • su biberi — results[15].names[30]; taxon id 78452; Persicaria hydropiper.
  • Гірчак перцевий — results[15].names[33]; taxon id 78452; Persicaria hydropiper.
  • mõru kirburohi — results[15].names[34]; taxon id 78452; Persicaria hydropiper.
  • Ūdenspipars — results[15].names[35]; taxon id 78452; Persicaria hydropiper.
  • horčiak pieprový — results[15].names[36]; taxon id 78452; Persicaria hydropiper.
  • Borsos keserűfű — results[15].names[37]; taxon id 78452; Persicaria hydropiper.
  • Y dinboeth — results[15].names[41]; taxon id 78452; Persicaria hydropiper.
  • Pimentela — results[15].names[42]; taxon id 78452; Persicaria hydropiper.
Plant references

Source-backed information

Published observations for this plant. Each reference supports the information beside it.

Taxonomy
Persicaria hydropiper is an accepted species in Catalogue of Life.

Taxonomic treatment in the August 2026 release; the catalogue record name is preserved.

Sources [1]
Botanical family
Polygonaceae

Family in the cited taxonomic treatment.

Sources [1]
Plant habit
Columnar; Erect

NC State Extension profile.

Sources [2]
Life cycle
Annual

NC State Extension profile.

Sources [2]
Growth rate
Rapid

NC State Extension profile.

Sources [2]
Foliage
Deciduous

NC State Extension profile.

Sources [2]
Light
Full sun (6 or more hours of direct sunlight a day); Partial Shade (Direct sunlight only part of the day, 2-6 hours)

NC State Extension profile.

Sources [2]
Moisture and drainage
Frequent Standing Water; Occasionally Wet

NC State Extension profile.

Sources [2]
Soil texture
Clay; High Organic Matter; Loam (Silt); Sand

NC State Extension profile.

Sources [2]
Flowering season
Autumn; Summer

NC State Extension profile. Seasons reflect the source region and do not verify the catalogue’s exact flowering months.

Sources [2]
Native range
Temp. Eurasia to Western & Central Malesia, North Western Africa

NC State Extension profile. Origin reported by the source; this is not a claim of local nativeness.

Sources [2]
Catalogue ratings

Who this plant supports

Honey bees

Low suitability
Nectar value Low
Pollen value Unknown
Plant profile

About this plant

Marshpepper Knotweed (Persicaria hydropiper) is a herbaceous plant. It flowers from July to October.

Sources and references

References for the information marked with source numbers on this page.

Sources checked
  1. Catalogue of Life Persicaria hydropiper — Catalogue of Life COL26.8

    COL26.8 (2026-08-20). Contributing checklist: Synonymic Checklists of the Vascular Plants of the World. This is taxonomic evidence, not an independent ecological study.

    Supports: TaxonomyBotanical family
    Relevant sections
    • Taxonomy: NameUsage.tsv line 887453; ID 4F9T2; rank species; status accepted
    • Botanical family: NameUsage.tsv line 887453; ID 4F9T2; rank species; status accepted

    Source checked on .

    Source data licence: CC BY 4.0.

  2. NC State Extension Persicaria hydropiper — Plant Toolbox

    NC State Extension Gardener Plant Toolbox. Growing conditions and seasons reflect its United States horticultural context.

    Supports: Plant habitLife cycleGrowth rateFoliageLightMoisture and drainageSoil textureFlowering seasonNative range
    Relevant sections
    • Plant habit: Habit/Form
    • Life cycle: Life Cycle
    • Growth rate: Growth Rate
    • Foliage: Woody Plant Leaf Characteristics
    • Light: Light
    • Moisture and drainage: Soil Drainage
    • Soil texture: Soil Texture
    • Flowering season: Flower Bloom Time
    • Native range: Country Or Region Of Origin

    Source checked on .