Louisiana’s humid conditions encourage weeds such as dollarweed and nutsedge to flourish in moist turf. If you are tired of guessing what is taking over your yard, looking at pictures of common lawn weeds in Louisiana can help you identify and treat them fast. This guide walks you through the most frequent offenders, with clear descriptions and practical removal steps.
You do not need to be a botanist to spot these plants. Most Louisiana weeds thrive in the warm, wet climate from spring through fall. By learning what they look like, you can stop them before they spread.
Pictures Of Common Lawn Weeds In Louisiana
This section covers the top weeds you will see in Louisiana lawns. Each entry includes visual clues and control methods. Keep your phone handy to snap a photo and compare.
Dollarweed
Dollarweed has round, shiny leaves that look like tiny lily pads. It loves wet areas and spreads quickly in poorly drained soil.
- Leaves: 1-2 inches wide, scalloped edges
- Stem: Creeping, roots at nodes
- Flowers: Small white blooms in summer
To remove dollarweed, improve drainage and reduce watering. Pull it by hand after rain when soil is soft. For large patches, use a selective herbicide with 2,4-D or dicamba.
Nutsedge
Nutsedge looks like grass but has a triangular stem and faster growth. It often grows taller than your lawn after mowing.
- Leaves: Three-ranked, V-shaped in cross section
- Stem: Solid, triangular
- Roots: Small tubers called nutlets
Do not pull nutsedge by hand because the tubers break off and regrow. Use a product containing halosulfuron or sulfentrazone. Apply in early summer for best results.
Chickweed
Chickweed forms dense mats in cool weather. It has small oval leaves and tiny white flowers.
- Leaves: Opposite, smooth edges
- Stem: Hairy, with a single line of hairs
- Flowers: Five white petals, deeply notched
Chickweed thrives in thin lawns. Overseed bare spots in fall. For existing patches, apply a pre-emergent in late winter or spot-treat with a broadleaf herbicide.
Henbit
Henbit has square stems and purple flowers. It grows low to the ground and blooms in early spring.
- Leaves: Rounded with scalloped edges, opposite
- Stem: Square, green or reddish
- Flowers: Purple, tubular, two-lipped
Mow high to shade out henbit. Hand pull small patches before it seeds. Use a post-emergent herbicide with metsulfuron or 2,4-D for larger areas.
Florida Betony
Florida betony has mint-like leaves and produces a crisp, white tuber that looks like a rattlesnake’s rattle. It spreads aggressively in moist soil.
- Leaves: Triangular, toothed edges
- Stem: Square, upright
- Roots: White segmented tubers
Digging out the tubers is the most effective method. Use a garden fork to loosen soil and remove as many as possible. Apply a post-emergent herbicide with triclopyr in fall.
Wild Violet
Wild violet has heart-shaped leaves and purple flowers. It spreads by underground stems and seeds.
- Leaves: Heart-shaped, glossy
- Stem: Short, creeping
- Flowers: Purple with five petals
Wild violet is tough to kill. Use a herbicide with triclopyr or 2,4-D plus dicamba. Apply in fall when the plant is storing energy. Repeat treatments may be needed.
Crabgrass
Crabgrass is a summer annual with wide, light green leaves. It grows in clumps and spreads by seed.
- Leaves: Broad, rolled in the bud
- Stem: Flat, branching at base
- Seed head: Finger-like spikes
Prevent crabgrass with a pre-emergent applied in early spring when soil temperatures reach 55°F. For existing plants, pull by hand or use a post-emergent with quinclorac.
Dandelion
Dandelion has a rosette of jagged leaves and a single yellow flower on a hollow stem. It produces a deep taproot.
- Leaves: Deeply lobed, forming a rosette
- Stem: Hollow, milky sap
- Flowers: Bright yellow, turning into white puffballs
Pull dandelions by hand, making sure to get the entire taproot. Use a dandelion digger for deep roots. Spot-treat with a broadleaf herbicide if needed.
Spurge
Spurge has small oval leaves with a purple spot and produces a milky sap. It grows flat against the ground.
- Leaves: Opposite, with a red or purple spot
- Stem: Prostrate, hairy
- Sap: White, sticky, can irritate skin
Spurge is drought-tolerant and thrives in compacted soil. Improve soil aeration and water deeply but infrequently. Use a pre-emergent in spring or spot-treat with a post-emergent containing 2,4-D.
Annual Bluegrass
Annual bluegrass is a light green grass with a boat-shaped leaf tip. It forms clumps and produces seed heads even when mowed short.
- Leaves: Bright green, boat-shaped tip
- Stem: Flat, smooth
- Seed head: Open panicle
Reduce watering in fall to discourage annual bluegrass. Use a pre-emergent in late summer. For existing plants, apply a post-emergent with prodiamine or dithiopyr.
How To Use Pictures For Identification
Taking good pictures is key to identifying weeds. Follow these steps to get clear shots.
- Photograph the whole plant, including roots if possible.
- Get a close-up of the leaf shape and arrangement.
- Capture any flowers or seed heads.
- Include a ruler or coin for scale.
- Take pictures in natural light, not direct sun.
Compare your photos to reliable online databases or apps. The LSU AgCenter website has a good weed identification tool. You can also share pictures on gardening forums for help.
Common Mistakes When Using Pictures
- Blurry or dark images that hide details
- Only showing the top of the plant, missing stem and roots
- Taking photos after mowing, which removes key features
- Confusing similar weeds like henbit and deadnettle
Take multiple shots from different angles. This gives you the best chance of a correct ID.
Prevention Tips For Louisiana Lawns
Stopping weeds before they start saves time and effort. Here are proven strategies for Louisiana conditions.
- Mow at the correct height for your grass type. St. Augustine should be 2.5-3 inches, Bermuda 1-2 inches.
- Water deeply once or twice a week, not daily. Shallow watering encourages weed seeds.
- Fertilize based on soil test results. Over-fertilizing feeds weeds.
- Aerate compacted soil in spring or fall to improve drainage.
- Overseed bare spots in fall to prevent weeds from moving in.
Consistent care makes your lawn dense enough to crowd out weeds. A healthy lawn is your best defense.
Seasonal Weed Calendar
Knowing when weeds appear helps you plan treatments.
- Late winter: Apply pre-emergent for summer annuals like crabgrass.
- Spring: Spot-treat broadleaf weeds like dandelion and henbit.
- Summer: Control nutsedge and dollarweed with targeted herbicides.
- Fall: Apply pre-emergent for winter annuals like chickweed and annual bluegrass.
Adjust timing based on your specific location in Louisiana. North Louisiana has cooler winters than the south.
Herbicide Safety And Application
Using chemicals correctly protects you, your family, and the environment.
- Read the label completely before mixing or applying.
- Wear gloves, long sleeves, and eye protection.
- Apply on calm days to avoid drift onto desirable plants.
- Do not apply before heavy rain, which washes away the product.
- Keep children and pets off the lawn until the spray has dried.
Spot-treat weeds instead of broadcasting over the whole lawn. This reduces chemical use and protects beneficial insects.
Organic Control Options
If you prefer non-chemical methods, try these.
- Boiling water: Pour directly on weeds in driveways or patios.
- Vinegar: Household vinegar works on young weeds; horticultural vinegar is stronger.
- Corn gluten meal: A natural pre-emergent applied in early spring.
- Hand pulling: Most effective after rain when soil is soft.
Organic methods require more effort and repeated applications. They work best on small infestations.
Frequently Asked Questions
What is the most common weed in Louisiana lawns?
Dollarweed and nutsedge are the most common weeds in Louisiana due to the humid, wet conditions. Both thrive in moist soil and spread quickly.
How can I identify a weed without pictures?
Look at the leaf shape, stem type, and growth habit. Check if the stem is round or square. Note the flower color and season. Compare these traits to online descriptions.
Is it safe to use vinegar on my lawn?
Household vinegar can kill young weeds but also damages grass. Use it only on weeds in cracks or bare soil. Horticultural vinegar is stronger but more likely to harm your lawn.
When should I apply pre-emergent in Louisiana?
Apply pre-emergent in late winter, usually February or March, when soil temperatures reach 55°F. A second application in late summer helps control winter weeds.
Can I pull nutsedge by hand?
Pulling nutsedge by hand often leaves tubers behind, causing regrowth. Use a herbicide specifically labeled for nutsedge instead. If you pull, dig deep to remove the entire root system.
Identifying weeds early saves you time and frustration. Keep a copy of these pictures of common lawn weeds in Louisiana handy. Compare your yard’s plants to the descriptions and take action quickly. With consistent care, you can maintain a healthy, weed-free lawn all year.
Remember that some weeds are more resistant than others. Wild violet and nutsedge may need multiple treatments. Be patient and persistent. Your lawn will thank you.
If you are still unsure about a weed, contact your local LSU AgCenter extension office. They can help with identification and recommend specific products for your area. Many offices also offer soil testing services to improve your lawn’s health.
Finaly, keep a weed journal. Note what you see each season and what treatments worked. Over time, you will become an expert at spotting and stopping weeds before they take over.