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Wiry Knotweed
Polygonum majus
About Wiry Knotweed (Polygonum majus) 0 Nurseries Carry This Plant Polygonum majus is a North American species of flowering plant in the buckwheat family known by the common name Wiry knotweed. It grows in the western United States and western Canada, from British Columbia south as far as the Sierra Nevada of northwestern Inyo County in California, east as far as Montana. Polygonum majus is an herb up to 60 cm (2 feet) tall. Stems are thin and wiry. Flowers are white or pink
Plant Description
Plant Type
Plant Type
Annual herb

0.49 - 2 ft tall

Flower Color
Flower Color
Pink, White

Wildlife Supported

Butterflies & moths hosted ( 17 likely * ) SHOW ALL

Landscaping Information
Natural Setting
Annual Precipitation: 11.5" - 68.8", Summer Precipitation: 0.75" - 2.00", Coldest Month: 26.0" - 46.2", Hottest Month: 49.2" - 70.6", Humidity: 0.30" - 21.25", Elevation: 2072" - 9177"

Sources include: Wikipedia. All text shown in the "About" section of these pages is available under the Creative Commons Attribution-ShareAlike License. Plant observation data provided by the participants of the California Consortia of Herbaria, Sunset information provided by Jepson Flora Project. Propogation from seed information provided by the Santa Barbara Botanical Garden from "Seed Propagation of Native California Plants" by Dara E. Emery. Sources of plant photos include CalPhotos, Wikimedia Commons, and independent plant photographers who have agreed to share their images with Calscape. Other general sources of information include Calflora, CNPS Manual of Vegetation Online, Jepson Flora Project, Las Pilitas, Theodore Payne, Tree of Life, The Xerces Society, and information provided by CNPS volunteer editors, with special thanks to Don Rideout. Climate data used in creation of plant range maps is from PRISM Climate Group, Oregon State University, using 30 year (1981-2010) annual "normals" at an 800 meter spatial resolution.

Links:   Jepson eFlora Taxon Page  CalPhotos  Wikipedia  Calflora

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