Greater duckweed
Spirodela polyrhiza (L.) Schleid.
- light
- Full sun
- water
- Plenty
- tall
- —
- wide
- 1 cm
Araceae
Also called Giant duckweed, Great Duckweed, Water Flexseed, Great duckmeat, Great duckweed
Formerly Lemna bannatica, Lemna major, Lemna maxima, Lemna orbicularis, and 9 more
When it flowers
Not known yet in the tropics: too few flowering observations to read a season from.
Read from iNaturalist photographs of it in flower. A month counts at 50% of the best month's flowering share (smoothed over three months) and 10% of its flowering count, from at least 100 flowering observations in the band.
If a child, a pet or anyone may have eaten a plant, contact a doctor or vet straight away, or call the National Poisons Information Centre (AIIMS, New Delhi) on 1800 116 117, free and open 24 hours.
Something wrong with it?About it
- Grows as
- HydroannualKew's checklist, not yet checked
- Climate
- TemperateKew's checklist, not yet checked
- Wild in
- CosmopolitanKew's checklist, not yet checked
- Light
- Full sun (6 h or more)Read from NC State Extension, one source
- Spread
- 1 cm to 1 cmRead from Wikipedia, one source
- Water
- Plenty: wet or constantly moistRead from NC State Extension, one source
- Coldest it survives
- -28.9 °C (USDA zone 5a)Read from NC State Extension, one source
Not known yet: height, flowers, heat, hottest it survives.
In other languages (12)
- root
- SPIPOL
- Italian
- Lenticchia d'acqua maggiore, Spirodela polyrrhiza
- Hebrew
- אגמית רבת-שורשים
- French
- Grande lentille d'eau, Spirodèle à plusieurs racine, Lenticule à plusieurs racines
- German
- Vielwurzelige Teichlinse, Vielwurzlige Teichlinse
- Czech
- závitka mnohokořenná
- Chinese
- 水萍, 紫萍, 浮萍
- Danish
- Stor andemad
- Korean
- 개구리밥
- Russian
- Многокоренник обыкновенный
- Norwegian Bokmål
- stor andemat
- Lithuanian
- Daugiašaknė maurė, Daugiašakė maurė
Where this comes from
- iNaturalist, read 2026-10-25, CC0-1.0 (observation counts)
- Wikidata, read 2026-10-25, CC0-1.0
- Kew's checklist, read 2026-10-24, CC-BY-4.0
- NC State Extension, read 2026-10-25, fact, cited
- Wikipedia, read 2026-10-26, fact, cited
- iNaturalist, read 2026-10-25, CC BY-SA
- iNaturalist, read 2026-10-25, CC BY
- iNaturalist, read 2026-10-25, CC BY
- iNaturalist, read 2026-10-25, CC BY
A fact “checked by a majority of its sources” was settled by a vote of the pages it was read from, not by a person reading it; one marked “one source” rests on that page alone. Anything else not marked checked has not been checked yet. Where nothing is known, the page says so rather than guess.