PatternBaseGiant Knotweed
Polygonum sachalinense, Polygonaceae
Guild Roles
Growing Conditions
Sun
Water
Soil pH
5.5 – 7.5
Tolerances
Companion Plants
Antagonistic Plants
Giant knotweed's aggressive growth and dense shade suppresses mammoth wild rye through light and root competition
Curlytop KnotweedPolygonum lapathifoliumCongeneric Polygonum species compete intensely for space and resources due to similar growth requirements
Weyrich's KnotweedPolygonum weyrichiiGiant knotweed species that compete aggressively for territory and resources
Common OracheAtriplex patulaGiant knotweed's height and density can shade out and suppress other herbaceous plants
Arrowleaf BuckwheatEriogonum compositumNative buckwheat can be outcompeted by aggressive invasive giant knotweed
Ground Plum MilkvetchAstragalus crassicarpusGiant knotweed dominates light and may suppress ground plum milkvetch through allelopathy in temperate zones
Uses
Functions
Edible Parts
Medicinal Uses
Common Questions
What zones does Giant Knotweed grow in?
Giant Knotweed grows in USDA hardiness zones 4 through 8.
What are good companion plants for Giant Knotweed?
Good companions for Giant Knotweed include Tropical Kudzu, Hungarian Vetch.
Design guilds with Giant Knotweed and see companion relationships visually.
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