We comply with the Federal Trade Commission 1998 Children’s Online Privacy Protection Act (COPPA). The 4-H Name and Emblem have special protections from Congress, protected by code 18 USC 707. Purple dead nettle plants have a characteristic square-shaped stem. Purple dead nettle is often confused with henbit, which has stemless leaves. It is an exceptionally hardy weed, and it can resist pests, disease, and harsh terrain conditions. Reference to commercial products or trade names does not imply endorsement by MSU Extension or bias against those not mentioned. Purple dead nettle or purple deadnettle is a member of the mint family. This information is for educational purposes only. Quentin Tyler, Director, MSU Extension, East Lansing, MI 48824. Issued in furtherance of MSU Extension work, acts of May 8 and June 30, 1914, in cooperation with the U.S. Michigan State University Extension programs and materials are open to all without regard to race, color, national origin, gender, gender identity, religion, age, height, weight, disability, political beliefs, sexual orientation, marital status, family status or veteran status. MSU is an affirmative-action, equal-opportunity employer, committed to achieving excellence through a diverse workforce and inclusive culture that encourages all people to reach their full potential. Please refer to E-434, "MSU Weed Control Guide for Field Crops," for herbicide recommendations.Ĭan serve as an alternate host for soybean cyst nematode. Fall and early spring herbicide applications are generally most effective and may also suppress seed production. Planting date: Tillage in the spring and planting later (mid-May) will reduce purple deadnettle infestations.Īpplication timing and effectiveness: Easily controlled with herbicides. Planting small grains at higher populations will suppress purple deadnettle. Rotary Hoeing: Primarily a no-till weed, not likely present at time of hoeing.Ĭrop rotation: Typically a problem of small grains, alfalfa and no-tillage systems. Tillage: Purple deadnettle is readily controlled by tillage in the late-fall or early spring. Thrives in nutrient-rich and mildly humic, loamy or sandy-loam soils. However, there have been reports of purple deadnettle seed still viable after 660 years.ĭormancy: Initially dormant, high summer temperatures break dormancy and seed germinated in the fall. Longevity: Moderate to very long persistence - about 20% of seed was lost from the soil seed bank each year in a 6 year experiment. Production Range: Produces 27,000 seeds per plant without competition. However, emergence can occur from 2 1/2-inch soil depths. Primarily emerges from soil depth of 1-inch or less. Plants die with hot, dry weather in late-May and June. Primarily emerges in the fall, flowering and seed set begins in early spring.
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