Skip to content
Skip to main content
PatternBase

Autumn Knotweed

Polygonum cognatum, Polygonaceae

Zones
4–9
Layer
Ground Cover
Lifespan
Annual
Growth
Fast

Guild Roles

Ground CoverMulch MakerDynamic Accumulator

Growing Conditions

Sun

Full Sun (preferred)Partial Shade (tolerated)

Water

Low (established)Low (seedling)

Soil pH

5.5 – 8

Tolerances

Drought
Frost
Heat
Pest Resistance
Disease Resist.

Companion Plants

Sulphur CloverTrifolium ochroleucon
Nutrient Accumulation

Antagonistic Plants

Wimmera RyegrassLolium rigidum

Autumn Knotweed competes with Wimmera Ryegrass for root space and light in Mediterranean climates

Uses

Functions

Quick Ground CoverSoil StabilizationNutrient AccumulationWeed SuppressionLate Season Biomass

Edible Parts

Young ShootsSeeds

Medicinal Uses

AstringentAnti-Inflammatory

Common Questions

What zones does Autumn Knotweed grow in?

Autumn Knotweed grows in USDA hardiness zones 4 through 9.

What are good companion plants for Autumn Knotweed?

Good companions for Autumn Knotweed include Sulphur Clover.

Design guilds with Autumn Knotweed and see companion relationships visually.

Try PatternBase free