Curlytop Knotweed

Polygonum lapathifolium, Polygonaceae

Zones

3–9

Layer

Herbaceous

Lifespan

Annual

Growth

Fast

Guild Roles

Dynamic AccumulatorGround CoverMulch MakerPollinator Attractor

Growing Conditions

Sun

Full Sun (preferred)Partial Shade (tolerated)

Water

High (established)High (seedling)

Soil pH

5.5 – 8

Tolerances

Drought

Frost

Heat

Pest Resistance

Disease Resist.

Companion Plants

Prickly SesbanSesbania bispinosa

Nitrogen Fixation

One-flowered VetchVicia monantha

Nitrogen FixationBeneficial Insect Habitat

Antagonistic Plants

Purple False BromeBrachypodium distachyon

Curlytop knotweed may compete with purple false brome for water and nutrients in marginal habitats

Giant KnotweedPolygonum sachalinense

Congeneric Polygonum species compete intensely for space and resources due to similar growth requirements

Bellard's KnotweedPolygonum bellardii

Congeneric Polygonum species with similar ecological requirements leading to competition

Uses

Functions

Rapid Biomass ProductionNutrient AccumulationSoil CoverageMoisture RetentionWetland Restoration

Edible Parts

Young LeavesSeeds

Medicinal Uses

Anti-InflammatoryWound Healing

Common Questions

What zones does Curlytop Knotweed grow in?

Curlytop Knotweed grows in USDA hardiness zones 3 through 9.

What are good companion plants for Curlytop Knotweed?

Good companions for Curlytop Knotweed include Prickly Sesban, One-flowered Vetch.

Design guilds with Curlytop Knotweed and see companion relationships visually.

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