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TOADFLAX, OLDFIELD
 Toadflax, Oldfield
[Nuttallanthus canadensis (L.) D. A. Sutton]
DESCRIPTION
Oldfield
toadflax is also known as common or blue toadflax. It is a winter annual or
biennial weed that is commonly found blooming in the spring in fields and
roadsides. Oldfield toadflax is most often found in the Piedmont and Coastal
Plain of North Carolina. The plant can flower from early spring (most common)
to late fall (less common) - depending on growing conditions. The small blue
flowers have three lobes and basal spurs. The leaves are small, bright green
and linear. Small clumps of leaves will form in early spring, and the blue
flowers will appear on long green stems shortly thereafter.
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Characteristic
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Description
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Growth Season
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winter annual weed or biennial weed
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Growth Habit
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upright
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Leaflet Number
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one
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Leaf Margin
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smooth
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Leaf Hairs
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none
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Leaf/Leaflet Shape
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linear/oblong
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Leaf Width
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<1/2 inch
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Leaf Venation
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Leaf Arrangement
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alternate
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Root Type
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Flower Color
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blue/purple
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oldfield
toadflax flower
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oldfield
toadflax
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Note: Still not
sure this is the right weed? The Turf
& Weed Identification Decision Aid may help. Check the TurfFiles glossary for definitions
of unfamiliar terms.
CULTURAL
CONTROL
Proper turf
management is important for biennial broadleaf weed control. Maintain a dense,
actively growing turf through proper mowing, fertilizing, and watering
practices. Mow at the proper height for your selected adapted turfgrass. Coring
and traffic control reduce compaction and encourage desirable turfgrass
competition. It is best to control this biennial broadleaf weed in spring or
fall, if actively growing at these times.
CHEMICAL
CONTROL
Controlled postemergence with
3-way broadleaf herbicide mixtures.
© North Carolina State University. This information sheet was prepared
by Fred Yelverton, Bridget R. Lassiter, Gail G. Wilkerson, Leon Warren, Travis Gannon, Jenifer J. Reynolds, and Gregory S. Buol. Department of Crop
Science, College of Agriculture & Life Sciences, North Carolina State
University. Prepared July 15, 2008. Available on-line at
www.turffiles.ncsu.edu. This publication was made possible through a grant
provided by the Center for Turfgrass Environmental Research & Education
(CENTERE) whose purpose is to support worthwhile projects that will benefit
both the private sector and the public, and protect the environment.
KEYWORDS FOUND IN THIS ARTICLE:
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