The Most Common Lawn Weeds in South Louisiana (And How to Get Rid of Them)
A healthy, green lawn is one of the best ways to boost your home's curb appeal. Unfortunately, South Louisiana's warm climate, frequent rainfall, and long growing season create the perfect environment—not just for grass, but for weeds as well.
If left untreated, weeds compete with your lawn for water, sunlight, and nutrients, leaving your grass thin and unhealthy. The first step toward effective weed control is knowing what you're dealing with.
Below are some of the most common lawn weeds found throughout South Louisiana and what you can do to keep them under control.
Why Are Weeds So Common in South Louisiana?
South Louisiana experiences mild winters, hot and humid summers, and plenty of rainfall. These conditions allow many weeds to grow nearly year-round.
Other factors that encourage weed growth include:
Thin or unhealthy turf
Poor mowing practices
Overwatering or underwatering
Compacted soil
Improper fertilization
Bare spots in the lawn
A thick, healthy lawn is your best defense against weeds.
1. Crabgrass
Crabgrass is one of the most recognizable summer weeds. It spreads outward from a central point, creating wide patches that quickly take over thin areas of your lawn.
How to Identify It
Light green color
Wide leaf blades
Grows low to the ground
Forms large clumps
When It Appears
Late spring through summer.
How to Prevent It
Apply a pre-emergent herbicide in late winter or early spring before soil temperatures warm enough for seeds to germinate.
Maintaining a thick lawn also helps prevent crabgrass from becoming established.
2. Doveweed
Doveweed has become one of the most troublesome weeds for homeowners across South Louisiana. It thrives in wet, poorly drained lawns and can quickly spread through St. Augustine and centipede grass.
How to Identify It
Thick, glossy leaves
Succulent stems
Creeping growth habit
Bright green appearance
Why It's Difficult
Doveweed is resistant to many common weed killers and often requires multiple treatments.
Improving drainage and avoiding excessive irrigation can help reduce future infestations.
3. Nutsedge ("Nutgrass")
Although many homeowners call it "nutgrass," nutsedge is actually a sedge rather than a true grass.
How to Identify It
Bright yellow-green color
Grows faster than surrounding grass
Triangular stems
Leaves grow in sets of three
Why It Keeps Coming Back
Nutsedge spreads through underground tubers, making it difficult to eliminate by pulling it by hand.
Specialized herbicides labeled for sedges are typically the most effective treatment.
4. Virginia Buttonweed
Virginia buttonweed is one of the toughest perennial weeds found in South Louisiana lawns.
How to Identify It
Dark green leaves
Small white star-shaped flowers
Creeping stems that root at the nodes
Why It's a Problem
Even small pieces left behind after pulling can produce new plants.
Professional treatment often provides the best results for established infestations.
5. Dollarweed
Dollarweed is easy to recognize thanks to its round, coin-shaped leaves.
How to Identify It
Circular leaves
Long stems
Low-growing habit
What It Means
Dollarweed often indicates excessive moisture in the lawn.
Improving drainage and watering less frequently can reduce its spread.
6. Chamberbitter
Sometimes called "little mimosa," chamberbitter is a common summer annual in South Louisiana.
How to Identify It
Looks similar to a small mimosa tree
Tiny leaves arranged along stems
Seed pods underneath each branch
Prevention
Apply pre-emergent herbicides before seeds germinate and remove young plants before they produce seeds.
7. Clover
While some homeowners don't mind clover, others prefer a uniform lawn.
How to Identify It
Three rounded leaflets
Small white flowers
Why It Appears
Clover often grows where nitrogen levels are low.
Proper fertilization can help your lawn outcompete it.
8. Annual Bluegrass (Poa annua)
Annual bluegrass is a cool-season weed that becomes noticeable during Louisiana's cooler months.
How to Identify It
Light green color
Small white seed heads
Clumps throughout the lawn
Prevention
Pre-emergent herbicides applied in the fall are the most effective way to reduce annual bluegrass.
9. Spurge
Spurge thrives in hot, dry conditions and often invades thin or stressed lawns.
How to Identify It
Reddish stems
Small oval leaves
Grows flat against the soil
Milky sap when broken
Prevention
Healthy turf and pre-emergent weed control help keep spurge from taking hold.
How to Prevent Lawn Weeds
While herbicides can help control weeds, prevention is always the best approach. A dense, healthy lawn naturally crowds out unwanted plants.
Here are a few ways to reduce weed problems:
Mow at the proper height for your grass type.
Water deeply but infrequently.
Fertilize according to your lawn's needs.
Fill bare spots with healthy turf.
Apply pre-emergent herbicides at the correct time of year.
Address drainage issues before they encourage moisture-loving weeds.
Consistent lawn maintenance goes a long way toward preventing future infestations.
When Should You Call a Professional?
Some weeds, such as doveweed, Virginia buttonweed, and nutsedge, can be extremely difficult to eliminate with over-the-counter products. If weeds continue returning despite your efforts, a professional lawn care program can save time, protect your grass, and provide longer-lasting results.
An experienced landscaping company can identify the specific weeds growing in your lawn and recommend treatments that are safe for your turf while helping restore a thick, healthy lawn.
Keep Your South Louisiana Lawn Looking Its Best
Every lawn in South Louisiana faces challenges from weeds, but they don't have to take over your yard. Proper mowing, watering, fertilization, and timely weed control can keep your lawn healthy and attractive throughout the year.
If you're struggling with stubborn weeds or want help maintaining a beautiful lawn, Emerald Landscapes provides professional lawn maintenance and landscape services throughout South Louisiana. Contact us today to schedule an evaluation and let us help your lawn thrive in every season.
