Lambsquarters, poor man’s spinach, white goosefoot, white pigweed, wild spinach, mealweed, others
Common lambsquarters is a common weed that grows a ground-hugging rosette form sometimes tinged with purple, and then grows into a bushy plant up to 5 feet tall. It blooms during the summer. While often considered edible, it can accumulate chemicals called oxalates that can be toxic if enough is eaten.
Typical plant growing in a disturbed site. Photo by S. Donaldson.
Light greenish-gray alternately attached leaves are triangular or goosefoot-shaped. The top is usually covered in a whitish powdery substance, and the underside is whitish. Lower leaves are larger and upper leaves are smaller.
The leaves are spear-shaped and covered with a whitish substance. Photo by S. Donaldson.
Branched; sometimes have purplish-red stripes and grooves.
Small and greenish-gray with no petals; found at the tips of the main stem and branches and in leaf axils (see photo page 2).
The small, greenish flowers are difficult to see and occur in clusters in the leaf axils. Photo by W. Hanson Mazet.
Grows a taproot with fibrous lateral roots.
Note the whitish powdery substance on the seedling leaves. Photo by W. Hanson Mazet.
Roadsides, pastures, gardens, landscaped areas and other disturbed sites.
Reproduces by seed; prolific seed producer
Common lambsquarters is best controlled when young. This can be difficult, as seeds may continue to sprout throughout the summer.
Dig, hoe or pull young plants. Plants usually don’t survive mowing or clipping.
Plant desirable vegetation to help suppress the lambsquarters. Corn gluten meal has been shown to help reduce survival of sprouting seeds.
None commercially available.
Try broadleaf selective herbicides such as 2,4-D and dicamba on young plants, or use glyphosate (nonselective). Dicamba can persist for several months and may damage desirable plants in the area treated. Pre-emergence herbicides can be used to manage existing seed banks.
DiTomaso, J.M. and E.A. Healy. 2007. Weeds of California and Other Western States. University of California Publication 3488.
HPIPM. 2009. Common lambsquarters. Bugwood Wiki
Peachy, E. (editor). 2011. Pacific Northwest Weed Management Handbook. Oregon State University, PNW.
Whitson, Tom D. (editor). 2002. Weeds of the West. University of Wyoming, Jackson, Wyoming.
USDA-NRCS Plants Database. 2011. PLANTS profile for Chenopodium album, USDA.
UC IPM. 2010. Common lambsquarters. IPM.
Weed Warriors Invasive Weed Training
The Weed Warriors program tackles the growing problem of weeds on public and private land.
Donaldson, S. and Hanson Mazet, W., 2011, A Northern Nevada Homeowner’s Guide to Identifying and Managing Common Lambsquarters, Extension | University of Nevada, Reno, FS-11-63
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