Purple Deadnettle
Lamium purpureum
Purple Deadnettle (Lamium purpureum) is a winter annual broadleaf weed characterized by triangular toothed leaves with purplish-red upper foliage; square stems; pink-purple flowers clustered at top.. It anchors via a fibrous roots root system and is selectively controlled using 2,4-D + MCPP + Dicamba (Post-emergent) applied during late winter to early spring before bloom completion..
2,4-D + MCPP + Dicamba (Post-emergent)
Triangular toothed leaves with purplish-red upper foliage; square stems; pink-purple flowers clustered at top.
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.
Need Professional Purple Deadnettle Eradication?
Connect with state-certified pesticide applicators and licensed weed control technicians.
Botanical Identification Key for Purple Deadnettle
Accurately identifying Lamium purpureum is essential because spraying non-selective chemicals like glyphosate risks killing desirable lawn grass. Look for these botanical hallmarks:
- Foliar Morphology: Triangular toothed leaves with purplish-red upper foliage; square stems; pink-purple flowers clustered at top..
- 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 Purple Deadnettle while preserving your lawn turfgrass, apply 2,4-D + MCPP + Dicamba (Post-emergent) during Late winter to early spring before bloom completion.. 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 Purple Deadnettle
01 How do I kill Purple Deadnettle without harming my lawn?
Use a selective herbicide labeled for your specific turfgrass species containing 2,4-D + MCPP + Dicamba (Post-emergent). Spray when Purple Deadnettle is actively growing during late winter to early spring before bloom completion.. Always check your host grass in our weed triage tool before application.
02 Why does pulling Purple Deadnettle by hand often fail?
Purple Deadnettle 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 Purple Deadnettle?
Purple Deadnettle is classified botanically as a Broadleaf weed with a Winter Annual life cycle.
04 When is the best time of year to treat Purple Deadnettle?
The optimal eradication window is Late winter to early spring before bloom completion.. Applying when temperatures are between 60°F and 85°F ensures maximum chemical absorption and prevents foliar heat stress to your desirable lawn.