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Common Types of Lawn Weeds in Louisiana

By Stan Kane ; Updated September 21, 2017
There are many lawn weed species common to Louisiana.
scorpion weed image by Brenton W Cooper from Fotolia.com

Louisiana's warm, temperate environment is ideally suited for the growth of a wide variety of lawn weed species. Common lawn weeds of Louisiana fall into two categories: broad-leaved and grass-like weeds. Broad-leaved weeds do not resemble lawn grass and are distinctly visible and identifiable by their broad leaves and flowering stems. Grass-like weeds, as the name implies, look very similar to lawn grass and in some instances, actually are a proper grass species.

Annual Sedge

Annual sedge (Cyperus brevifolius) is a grass-like perennial that forms dense mats of dark-green leaves up to 6 inches thick. Annual sedge spreads by above-ground seeds and underground rhizomes. Overwatered, moist lawn areas are prone to annual sedge.

Bristly Mallow

Bristly mallow (Modiola caroliniana) is a broad-leaved perennial with light-green, shiny leaves forming on multiple stems and nodes. During early spring, orange-red flowers are visible. Pull out by hand or apply a post-emergence herbicide on existing weeds.

Black medic

Black medic (Medicago lupulina) is a broad-leaved, summer annual with green, clover-like foliage and yellow flowers. Black medic thrives in infertile, low nitrogen soils and produces seeds near the base, allowing propagation even in a regularly mowed lawn. Add nitrogen rich fertilizer to your lawn to help prevent black medic weeds from forming.

Broadleaf Plantain

Broadleaf plantain (Plantago major) is a broad-leaved, low growing, perennial weed with wide, green leaves arching outward from a central stem. Broadleaf plantains grow most rapidly during the late summer and produce a perforated seed pod growing vertically from the central node. Broadleaf plantains can be physically removed by hand or sprayed with a selective broadleaf herbicide.

Chamber Bitter

Chamber bitter (Phyllanthus urinaria) is a grass-like, warm-season annual, with grooved, vertical, green leaves. This weed propagates by exploding seed pods, which scatter seeds around the lawn. Pull isolated weeds by hand, as necessary.


About the Author


Stan Kane is an experienced professional pilot and freelance writer. He enjoys writing about a diverse range of outdoor, science and technology topics. Kane has a Bachelor of Science degree from Florida Tech and has been writing for Demand Studios since 2009.