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Stachys arvense Common name: Stagger weed, Hedge nettle, Mint weed. Palatability to Livestock: Moderate. Toxicity to Goats: Moderate risk. Toxicity to Other Species: Toxic to sheep, cattle and horses. . Small flowers are tubular, surrounded by a long calyx, pale pink to purple, in opposite groups, in forks of leaves, with two lips. . A similar plant, L. amplexicaule, or deadnettle, does not have stalks on the leaves below the flowers. . Native to Europe, found in all Australian states, on old cultivated land, stubble and roadsides. . Grows mainly in autumn, winter and spring. . Causes staggers or shivers, mainly in horses, also sheep and cattle, noticeable particularly after exercise. . Most cases occur in August to October. Poisonous Principle: Unknown, central nervous system toxin. Effects: Signs and Symptoms: . Hind leg weakness, . Abnormalities in gait after some weeks, . Staggers, or shivers after exercise, . Knuckling over at the fetlocks. Health and Production Problems: . Weight loss. . Stock may die from secondary infections. Treatment: . Most stock recover when taken off the weed. . Be aware of potential stock problems. Integrated Control Strategy: . Herbicides, Group B or C. . Control achieved by pasture management. Comments: . A sprawling, annual herb, growing up to 30 cms high, with a strong mint odour when crushed. . Square stems are softly and weak, square in cross section, and softly hairy. . Leaves are on short stalks, flared at the base, opposite, oval, pale dull yellow-green and slightly toothed. Picture: Stachys arvense Weed Control; Lucerne. 1992 Further Reading: . Dowling and McKenzie. Poisonous Plants. 1994. . Everist. Poisonous Plants of Australia. 1981. . Lamp and Collett. Field Guide to Weeds in Australia. 1979. . McBarron. Poisonous Plants Handbook. 1983. Information included in this Info Sheet was obtained from the source documents, and no responsibility will be accepted by the compiler.