Advanced Search Map Locator
View Settings
Nurseries Carrying this Plant Add Current Plant To List Edit Current Plant
Show all Photos

About Calscape Nurseries
California Garden Planner Bay Area Garden Planner (NEW) Planting Guide
Butterflies My Plant Lists
Contact Calscape
Tap map to see plants native to location
Order by Popularity Order by Common Name Order by Scientific Name Order by # of Butterflies Hosted
Show nursery cultivars Hide nursery cultivars
Show plants not in nurseries Hide plants not in nurseries
Grid view Text view
Spurry Knotweed
Polygonum spergulariiforme
About Spurry Knotweed (Polygonum spergulariiforme) 0 Nurseries Carry This Plant Polygonum spergulariiforme is a North American species of flowering plants in the buckwheat family known by the common name spurry knotweed or fall knotweed. It grows in western Canada (British Columbia and Saskatchewan) and the western United States (primarily Washington, Oregon, and northern and central California but with a few isolated populations in Idaho, Wyoming and Montana). Polygonum spergulariiforme is a green, branching herb up to 50 cm (20 in) tall. Leaves are narrow, up to 6 cm (2. 4 in) long. Flowers are pink or white, in dense, elongated clumps. The plant flowers from June to October, later than some of its relatives.
Plant Description
Plant Type
Plant Type
Annual herb

0.16 - 1.6 ft tall

Flower Color
Flower Color
Pink, White

Wildlife Supported

Butterflies & moths hosted ( 23 likely * ) SHOW ALL

Landscaping Information
Natural Setting
Annual Precipitation: 11.5" - 133.4", Summer Precipitation: 0.44" - 3.85", Coldest Month: 26.4" - 49.1", Hottest Month: 47.3" - 73.4", Humidity: 0.48" - 23.65", Elevation: 275" - 9567"

Alternative Names
Common Names: Fall Knotweed

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

Sign in to your Calscape Account X

Once signed in, you'll be able to access any previously saved plant lists or create new ones.

Email Address

Sign In