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Potamogeton nodosus (Knotty pondweed) | NPIN

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Potamogeton nodosus (Knotty pondweed)
Marcus, Joseph A.

Potamogeton nodosus

Potamogeton nodosus Poir.

Knotty Pondweed, Longleaf pondweed

Potamogetonaceae (Pondweed Family)

Synonym(s): Potamogeton americanus, Potamogeton fluitans

USDA Symbol: pono2

USDA Native Status: L48 (N), HI (N), PR (N), CAN (N)


Plant Characteristics

Duration: Perennial
Habit: Herb
Breeding System: Flowers Bisexual
Size Notes: 1-3
Leaf: Green
Size Class: 1-3 ft.

Bloom Information

Bloom Color: White , Green
Bloom Time: May , Jun , Jul , Aug


USA: AL , AR , AZ , CA , CO , CT , DC , DE , FL , GA , HI , IA , ID , IL , IN , KS , KY , LA , MA , MD , ME , MI , MN , MO , MS , MT , NC , ND , NE , NH , NJ , NM , NV , NY , OH , OK , OR , PA , RI , SC , SD , TN , TX , UT , VA , VT , WA , WI , WV , WY
Canada: NB , NS
Native Habitat: Partial to marginal to deepwater aquatic areas. Zones 7 - 11, with an indefinite range.

Growing Conditions

Water Use: High
Light Requirement: Sun , Part Shade
Soil Moisture: Wet
CaCO3 Tolerance: Low
Aquatic: yes
Conditions Comments: Use as oxygenator in water gardens. The variety P. crispus tolerates polluted water better than other oxygenators. Decorative, trailing habit in ponds. Grow in aquatic containers of sandy loam, root in muddy pool bottoms at depth of 6 - 24.


Interesting Foliage: yes
Deer Resistant: High

From the National Organizations Directory

According to the species list provided by Affiliate Organizations, this plant is on display at the following locations:

Lady Bird Johnson Wildflower Center - Austin, TX


Bibref 841 - Native Alternatives to Invasive Plants (2006) Burrell, C. C.

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Recommended Species Lists

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Additional resources

USDA: Find Potamogeton nodosus in USDA Plants
FNA: Find Potamogeton nodosus in the Flora of North America (if available)
Google: Search Google for Potamogeton nodosus


Record Modified: 2007-01-01
Research By: NPC

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