Water Smartweed

Polygonum amphibium, Polygonaceae

Zones

3–9

Layer

Herbaceous

Lifespan

Perennial

Growth

Fast

Guild Roles

ProducerGround CoverPollinator AttractorBeneficial Insect Habitat

Growing Conditions

Sun

Full Sun (preferred)Partial Shade (tolerated)

Water

High (established)High (fruiting)High (seedling)

Soil pH

6 – 8.5

Tolerances

Drought

Frost

Heat

Pest Resistance

Disease Resist.

Companion Plants

SpatterdockNuphar advena

Beneficial Insect Habitat

Twig RushCladium mariscoides

Physical SupportBeneficial Insect Habitat

Great BulrushScirpus validus

Wind ProtectionBeneficial Insect HabitatPhysical Support

Antagonistic Plants

Bearded KnotweedPolygonum barbatum

Related smartweeds may compete and exhibit allelopathic interactions when growing in proximity

Alligator WeedAlternanthera philoxeroides

Water smartweed and alligator weed compete aggressively for aquatic habitats

Uses

Functions

Water FiltrationErosion ControlHabitat CreationNutrient Cycling

Edible Parts

SeedsLeaves

Medicinal Uses

AstringentAnti-Inflammatory

Common Questions

What zones does Water Smartweed grow in?

Water Smartweed grows in USDA hardiness zones 3 through 9.

What are good companion plants for Water Smartweed?

Good companions for Water Smartweed include Spatterdock, Twig Rush, Great Bulrush.

Design guilds with Water Smartweed and see companion relationships visually.

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