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Marcus, Joseph A.
Potamogeton nodosus Poir.
Knotty Pondweed, Longleaf pondweed
Synonym(s): Potamogeton americanus, Potamogeton fluitans
USDA Symbol: pono2
Plant CharacteristicsDuration: Perennial Habit: Herb Breeding System:
Flowers Bisexual Size Notes:
Green Fruit: Size Class:
Bloom InformationBloom Color: White , Green
Bloom Time: May , Jun , Jul , Aug
, WY Canada: NB
, NS Native Habitat:
Partial to marginal to deepwater aquatic areas. Zones 7 - 11, with an indefinite range.
Growing ConditionsWater Use: High
Light Requirement: Sun , Part Shade
Soil Moisture: Wet
CaCO3 Tolerance: Low
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.
BenefitInteresting Foliage: yes
Deer Resistant: High
National Wetland Indicator Status
This information is derived from the U.S. Army Corps of Engineers National Wetland Plant List, Version 3.1
(Lichvar, R.W. 2013. The National Wetland Plant List: 2013 wetland ratings. Phytoneuron 2013-49: 1-241). Click here
for map of regions.
From the National Organizations Directory
According to the species list provided by Affiliate Organizations, this plant is either on display or available from the following:
Lady Bird Johnson Wildflower Center
- Austin, TX
Record Last Modified: 2007-01-01
Research By: NPC