University of Maryland Extension

Deadnettle

(More Lawn Weeds)  (Lawn Control Options)  

Deadnettle
Lamium purpureum

deadnettle

Lifecycle

Winter annual noticeable in spring when light purple flowers are in bloom. Dies out in late spring.

Growth habit

Square stems. Leaves opposite, triangular, pointed, and overlapping and crowded near top of stem. Leaves often with purple coloring. Pinkish-purple lipped flowers borne at top of plant. Fibrous root system doesn't creep along the ground.

Reproduction

Produces seed in the spring; seed germinates in the early fall or early spring

deadnettle closeup


Conditions that favor growth

Mowing the lawn too short.

Management

Cultural controlMaintain healthy, dense turf that can compete and prevent weed establishment.

Mechanical control: Hand pulling or using an appropriate weeding tool are the primary means of mechanical weed control in lawns. This is a viable option at the beginning of an infestation and on young weeds. Hand pulling when the soil is moist makes the task easier. Weeds with tap roots like dandelions or have a basal rosette (leaves clustered close to the ground) like plantain are easier to pull than weeds such as Bermudagrass (wiregrass) or creeping Charlie (ground ivy) that spread with stolons or creeping stems that root along the ground.
General chemical control: (lawns) Spot treat weeds with a liquid, selective, postemergent, broadleaf weed killer applied when weeds are actively growing. Look for a product with one or more of the following active ingredients: 2, 4-DMCPP (mecoprop), Dicamba* or Triclopyr.

*Do not spray herbicides containing dicamba over the root zone of trees and shrubs. Roots can absorb the product possibly causing plant damage. Read the product label for precautions. 

Organic Control:

For a glossary of herbicide terms and additional information see: control options 

 

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