Henbit
Lamium amplexicaule
Henbit (Lamium amplexicaule) is a winter annual broadleaf weed characterized by square stems with scalloped leaves clasping the stem without petioles; reddish-purple tubular flowers in early spring.. It anchors via a fibrous roots root system and is selectively controlled using Isoxaben (Fall Pre-emergent) or 2,4-D + Dicamba (Early Spring Post-emergent) applied during september to october pre-emergent or very early spring before flowers set seed..
Isoxaben (Fall Pre-emergent) or 2,4-D + Dicamba (Early Spring Post-emergent)
Square stems with scalloped leaves clasping the stem without petioles; reddish-purple tubular flowers in early spring.
Always read and follow the manufacturer's EPA-approved pesticide product label. The label is the law under federal FIFRA (Federal Insecticide, Fungicide, and Rodenticide Act) regulations. Application rates, personal protective equipment (PPE), target weed maturity stages, temperature restrictions, and grazing or re-entry intervals specified on the EPA container label supersede all online recommendations. Local state regulations may restrict certain active ingredients.
University-Verified Herbicide Formulations
Professional active formulations cross-referenced against university weed science trials.
Tenacity Herbicide (Mesotrione 8 oz)
Active: 40% Mesotrione Selective Systemic
Gold standard selective pre- and post-emergent targeting crabgrass, ground ivy, yellow nutsedge, and clover during overseeding.
SedgeHammer+ Turf Herbicide (Halosulfuron 0.5 oz)
Active: 5% Halosulfuron-methyl with Surfactant
Pre-mixed with surfactant for 1-gallon sprayers. Translocates into underground nutlets without injuring cool or warm season lawns.
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Botanical Identification Key for Henbit
Accurately identifying Lamium amplexicaule is essential because spraying non-selective chemicals like glyphosate risks killing desirable lawn grass. Look for these botanical hallmarks:
- Foliar Morphology: Square stems with scalloped leaves clasping the stem without petioles; reddish-purple tubular flowers in early spring..
- Root Architecture: Anchored by a fibrous roots, making manual pulling ineffective unless the entire root crown is extracted.
- Growth Period: Active during winter annual cycles, flourishing when lawn turf is stressed or cut too short.
Eradication Protocol & Selective Herbicide Selection
To eradicate Henbit while preserving your lawn turfgrass, apply Isoxaben (Fall Pre-emergent) or 2,4-D + Dicamba (Early Spring Post-emergent) during September to October pre-emergent or very early spring before flowers set seed.. Ensure that the active ingredients match your host turfgrass tolerances:
- Temperature Safety Band: Apply when ambient air temperatures range between 65°F and 85°F. Never apply volatile ester herbicides in temperatures exceeding 85°F to prevent herbicide vapor drift and leaf burn.
- Adjuvant / Surfactant: For waxy or hairy weed foliage, mix with a methylated seed oil (MSO) or non-ionic surfactant according to EPA label instructions to enhance chemical cuticle penetration.
- Mowing Holdback: Do not mow the lawn 2 days prior to spraying or 2 days after application to maximize foliar surface area for chemical absorption.
Frequently Asked Questions About Henbit
01 How do I kill Henbit without harming my lawn?
Use a selective herbicide labeled for your specific turfgrass species containing Isoxaben (Fall Pre-emergent) or 2,4-D + Dicamba (Early Spring Post-emergent). Spray when Henbit is actively growing during september to october pre-emergent or very early spring before flowers set seed.. Always check your host grass in our weed triage tool before application.
02 Why does pulling Henbit by hand often fail?
Henbit anchors via a fibrous roots. Hand-pulling often breaks the crown or leaves underground root fragments, rhizomes, or nutlets behind, which triggers rapid regrowth. Systemic selective herbicides translocate down through the vascular tissue to destroy the entire root structure.
03 What class of weed is Henbit?
Henbit is classified botanically as a Broadleaf weed with a Winter Annual life cycle.
04 When is the best time of year to treat Henbit?
The optimal eradication window is September to October pre-emergent or very early spring before flowers set seed.. Applying when temperatures are between 60°F and 85°F ensures maximum chemical absorption and prevents foliar heat stress to your desirable lawn.