Water Knotweed

Scientific Name: Polygonum amphibium L.

Classification: Plantae/ Tracheobionta / Spermatophyta / Magnoliophyta / Magnoliopsida / Caryophyllidae / Polygonales / Polygonaceae / Polygonum L./ Polygonum amphibium L.

Water Knotweed
General Information
Usda SymbolPOAM8
GroupDicot
Life CyclePerennial
Growth HabitsForb/herb
Native LocationsPOAM8

Plant Guide

Use a soil moisture meter to monitor the soil moisture where Water Knotweed is planted.

Plant Traits

Growth Requirements

Temperature, Minimum (°F)-23
Adapted to Coarse Textured SoilsNo
Adapted to Fine Textured SoilsYes
Adapted to Medium Textured SoilsYes
Anaerobic ToleranceHigh
CaCO3 ToleranceMedium
Cold Stratification RequiredNo
Drought ToleranceNone
Fertility RequirementMedium
Fire ToleranceMedium
Frost Free Days, Minimum110
Hedge ToleranceNone
Moisture UseHigh
pH, Maximum7.0
pH, Minimum4.0
Precipitation, Maximum60
Precipitation, Minimum14
Root Depth, Minimum (inches)6
Salinity ToleranceNone
Shade ToleranceIntolerant


Morphology/Physiology

BloatNone
ToxicityNone
Resprout AbilityNo
Shape and OrientationProstrate
Active Growth PeriodSummer
Coppice PotentialNo
Fall ConspicuousNo
Fire ResistantYes
Flower ColorYellow
Flower ConspicuousNo
Foliage ColorGreen
Foliage Porosity SummerPorous
Foliage Porosity WinterPorous
Foliage TextureMedium
Fruit/Seed ConspicuousNo
Growth FormRhizomatous
Growth RateModerate
Height, Mature (feet)0.1
Known AllelopathNo
Leaf RetentionNo
LifespanModerate
Low Growing GrassNo
Nitrogen FixationNone
Fruit/Seed ColorBrown


Reproduction

Propagated by SeedYes
Propagated by SodNo
Propagated by SprigsNo
Propagated by TubersNo
Seed per Pound125000
Fruit/Seed Period EndFall
Seed Spread RateModerate
Seedling VigorLow
Small GrainNo
Vegetative Spread RateSlow
Propagated by CormNo
Propagated by ContainerNo
Propagated by BulbNo
Propagated by Bare RootNo
Fruit/Seed PersistenceNo
Fruit/Seed Period BeginSummer
Fruit/Seed AbundanceLow
Commercial AvailabilityRoutinely Available
Bloom PeriodLate Spring
Propagated by CuttingsNo


Suitability/Use

Veneer ProductNo
Pulpwood ProductNo
Post ProductNo
Palatable HumanNo
Palatable Graze AnimalMedium
Nursery Stock ProductNo
Naval Store ProductNo
Lumber ProductNo
Fodder ProductNo
Christmas Tree ProductNo
Berry/Nut/Seed ProductNo

Water Knotweed

Water Knotweed

Water Knotweed

Water Knotweed

Water Knotweed

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