Pennsylvania Smartweed

Polygonum pensylvanicum, Polygonaceae

Zones

3–9

Layer

Herbaceous

Lifespan

Annual

Growth

Fast

Guild Roles

Ground CoverMulch MakerDynamic Accumulator

Growing Conditions

Sun

Full Sun (preferred)Partial Shade (tolerated)

Water

Moderate (established)High (seedling)

Soil pH

5.5 – 7.5

Tolerances

Drought

Frost

Heat

Pest Resistance

Disease Resist.

Companion Plants

Purple SesbanSesbania punicea

Nitrogen FixationShade Provision

Slenderleaf BundleflowerDesmanthus leptophyllus

Nitrogen FixationPollinator Sharing

Korean Bush CloverLespedeza stipulacea

Nitrogen FixationBeneficial Insect HabitatPollinator Sharing

Virginia MallowSida hermaphrodita

Beneficial Insect HabitatPollinator SharingPhysical Support

Antagonistic Plants

Blue FlaxLinum perenne

Fast-growing Pennsylvania smartweed outcompetes slower-establishing blue flax for resources

Hoary ScurfpeaPsoralea canescens

Pennsylvania smartweed aggressive growth pattern overwhelms slower scurfpea establishment

Uses

Functions

Rapid Ground CoverBiomass ProductionNutrient AccumulationWildlife Food

Edible Parts

Seeds

Common Questions

What zones does Pennsylvania Smartweed grow in?

Pennsylvania Smartweed grows in USDA hardiness zones 3 through 9.

What are good companion plants for Pennsylvania Smartweed?

Good companions for Pennsylvania Smartweed include Purple Sesban, Slenderleaf Bundleflower, Korean Bush Clover, Virginia Mallow.

Design guilds with Pennsylvania Smartweed and see companion relationships visually.

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