Identifying common weeds in Alabama lawns helps homeowners act before small patches become full-scale infestations. Alabama’s warm, humid climate and long growing season support a wide range of grassy and broadleaf weeds that thrive in both cool and warm seasons.

Some species spread by seed, others by creeping stems or underground rhizomes, and a few do both. That means treatments must match the weed’s growth habit, not just its appearance.

Timing also matters. Pre-emergent herbicides work only before seeds germinate, while post-emergent products work best on young, actively growing weeds. Understanding each species’ life cycle is essential for effective control.

Below are 20 of the most common weeds in Alabama lawns, with identification features, growth habits, and control guidance for each.

20 Common Weeds In Alabama Lawns

1. Crabgrass (Digitaria spp.) – Common Weeds In Alabama Lawns

Crabgrass is among the most common weeds in Alabama lawns because it thrives in hot, dry conditions where turfgrass thins. It spreads rapidly by seed and forms dense, sprawling clumps that smother desirable grass.

Identification is straightforward: light green blades with a distinctive finger-like seed head in late summer. The plant germinates when soil reaches 55°F in spring and dies at the first frost.

Apply pre-emergent herbicide in early spring before germination and maintain thick turf to shade out seedlings. Post-emergent products work on young plants but not on mature clumps.

Pros:

• Pre-emergent prevents it
• Easy to identify
• Dies at first frost
• Widely documented
• Thick turf prevents it
• Seed heads distinctive
• Multiple controls exist

Cons:

• Spreads rapidly
• Seed banks persist
• Hard to kill when mature

2. Dallisgrass (Paspalum dilatatum) – Common Weeds In Alabama Lawns

Dallisgrass is one of the common weeds in Alabama lawns because its deep-rooted clumps return every spring and expand each year. Unlike crabgrass, it is a perennial that survives winter and spreads through both seed and short rhizomes.

Identification is by the coarse, light green clumps with a distinctive seed head that branches into a Y shape. The plant grows faster than lawn grass and forms unsightly patches.

Dig out individual clumps with the entire root system, since herbicides rarely kill mature plants. Spot-treat with selective post-emergent herbicides in spring and fall.

Pros:

• Digging removes fully
• Selective herbicides work
• Easy to spot
• Controllable if caught early
• Widely studied
• Multiple treatment windows
• Seed head distinctive

Cons:

• Perennial returns yearly
• Deep roots hard to remove
• Herbicide tolerance common

3. Bermuda Grass (Cynodon dactylon) – Common Weeds In Alabama Lawns

Bermuda grass is one of the common weeds in Alabama lawns when it invades flower beds and fescue lawns, even though it is a desirable turf in full-sun areas. It spreads aggressively by both seeds and rhizomes.

Identification is by the fine, grey-green blades with distinctive runners and a deep root system. The plant grows so aggressively it can take over entire garden beds within one season.

Use a non-selective herbicide in beds when Bermuda is active and other plants are protected. Repeated treatment through the season is usually needed.

Pros:

• Desirable as turf
• Recognisable growth habit
• Non-selective controls exist
• Well documented
• Drought tolerant
• Grows fast
• Spread pattern visible

Cons:

• Very aggressive spreader
• Rhizomes persist
• Hard to remove from beds

4. Nutsedge (Cyperus spp.) – Common Weeds In Alabama Lawns

Nutsedge is one of the common weeds in Alabama lawns because it thrives in wet, poorly drained soil and spreads through underground tubers called nutlets. These tubers survive most herbicides and regrow the following season.

Identification is by the yellow-green blades with a distinctive triangular stem and shallow root system. The plant grows faster than lawn grass and stands above the turf after mowing.

Apply halosulfuron-based herbicides when nutsedge is actively growing and repeat every six to eight weeks. Improve drainage to prevent the wet conditions nutsedge prefers.

Pros:

• Specialist herbicides work
• Triangular stems distinctive
• Grows above turf
• Well documented
• Drainage reduces it
• Multiple products exist
• Controllable over time

Cons:

• Tubers persist for years
• Resists most herbicides
• Spreads quickly

5. Chamberbitter (Phyllanthus urinaria) – Common Weeds In Alabama Lawns

Chamberbitter is one of the common weeds in Alabama lawns in warm, humid summers when it appears seemingly overnight. It grows quickly, produces thousands of seeds, and spreads through lawns and garden beds.

Identification is by the small, fern-like leaves along upright stems with tiny fruit clusters on the underside. The plant reseeds aggressively and returns year after year.

Apply broadleaf herbicides in early summer when plants are young and before seeds form. Mulch garden beds to prevent seedling germination.

Pros:

• Herbicides effective when young
• Distinctive foliage
• Mulch prevents it
• Well documented
• Controllable with timing
• Identifiable early
• Multiple products exist

Cons:

• Reseeds aggressively
• Spreads fast
• Seed bank persists

6. Henbit (Lamium amplexicaule) – Common Weeds In Alabama Lawns

Henbit is one of the common weeds in Alabama lawns during cool seasons when it forms dense purple-flowered patches in thin turf. It is a winter annual that germinates in autumn and dies by late spring.

Identification is by the square stems with rounded, scalloped leaves and small purple flowers on top. The plant grows close to the ground and spreads by seed.

Apply post-emergent broadleaf herbicides in late autumn or early spring when henbit is actively growing. Thick turf prevents germination in the first place.

Pros:

• Dies naturally in spring
• Herbicides effective
• Distinctive purple flowers
• Preventable with thick turf
• Well documented
• Controllable with timing
• Predictable season

Cons:

• Spreads quickly by seed
• Forms dense patches
• Returns each autumn

7. Chickweed (Stellaria media) – Common Weeds In Alabama Lawns

Chickweed is one of the common weeds in Alabama lawns during cool, wet weather when it forms dense mats across thin turf. It is a winter annual that germinates in autumn and flowers by spring.

Identification is by the small, star-shaped white flowers and opposite oval leaves on sprawling stems. The plant stays low and spreads by seed and rooting stems.

Apply broadleaf herbicides in autumn or early spring when chickweed is young. Improve drainage since chickweed thrives in wet, compacted soil.

Pros:

• Herbicides effective
• Distinctive star flowers
• Dies in warm weather
• Well documented
• Preventable with thick turf
• Predictable season
• Multiple products exist

Cons:

• Forms dense mats
• Spreads by rooting stems
• Returns each autumn

8. Annual Bluegrass (Poa annua) – Common Weeds In Alabama Lawns

Annual bluegrass is one of the common weeds in Alabama lawns during cool months when it forms pale green patches across warm-season turf. It is a winter annual that dies in summer heat but reseeds heavily before that.

Identification is by the light green clumps with distinctive white seed heads that appear in late winter. The plant grows faster than warm-season grass in cool weather.

Apply pre-emergent herbicide in late summer before germination and maintain dense turf to shade out seedlings. Post-emergent options are limited for established plants.

Pros:

• Pre-emergent prevents it
• Dies in summer heat
• Distinctive seed heads
• Well documented
• Controllable with timing
• Predictable season
• Multiple products exist

Cons:

• Reseeds heavily
• Hard to kill when mature
• Returns each cool season

9. Florida Betony (Stachys floridana) – Common Weeds In Alabama Lawns

Florida betony is one of the common weeds in Alabama lawns because it spreads through underground tubers that resemble rattlesnake rattles. These tubers survive most herbicides and regrow the following season.

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Identification is by the square stems with opposite, scalloped leaves and small purple flowers. The plant spreads aggressively through lawns and garden beds.

Apply broadleaf herbicides in autumn and spring when Florida betony is actively growing. Repeated treatments over two or three seasons are usually needed to exhaust tubers.

Pros:

• Herbicides effective
• Distinctive tubers
• Treatable with persistence
• Well documented
• Multiple treatment windows
• Predictable growth
• Controllable over time

Cons:

• Tubers persist for years
• Spreads aggressively
• Hard to fully eradicate

10. Wild Onion And Wild Garlic (Allium spp.) – Common Weeds In Alabama Lawns

Wild onion and wild garlic are among the common weeds in Alabama lawns because they spread through underground bulbs that survive most control efforts. They appear in cool weather and produce a distinct onion smell when mowed.

Identification is by the slender, waxy leaves with a strong onion odour when crushed and small white or pink flower clusters. The bulbs send up new shoots each season.

Apply broadleaf herbicides containing 2,4-D or metsulfuron in late winter when wild onion is actively growing. Repeat applications over two to three seasons are usually necessary.

Pros:

• Distinctive onion smell
• Herbicides effective
• Visible in cool months
• Well documented
• Multiple products exist
• Controllable with persistence
• Predictable season

Cons:

• Bulbs persist for years
• Requires repeat treatments
• Hard to fully eradicate

11. White Clover (Trifolium repens) – Common Weeds In Alabama Lawns

White clover is one of the common weeds in Alabama lawns because it thrives in low-nitrogen soil where turfgrass struggles. It spreads by creeping stems and self-seeds freely once established.

Identification is by the three-lobed leaves with a white V-shaped mark and small white flower heads. The plant grows low and spreads by stolons.

Apply broadleaf herbicides containing 2,4-D or dicamba when clover is actively growing. Improving soil nitrogen reduces clover competitiveness over time.

Pros:

• Herbicides effective
• Distinctive three-lobed leaves
• Nitrogen reduces it
• Well documented
• Multiple products exist
• Predictable spread
• Controllable with timing

Cons:

• Spreads by stolons
• Self-seeds freely
• Returns in poor soil

12. Ground Ivy (Glechoma hederacea) – Common Weeds In Alabama Lawns

Ground ivy is one of the common weeds in Alabama lawns in shaded, moist areas where turfgrass thins. It spreads by creeping stems that root at nodes and by seed.

Identification is by the scalloped, kidney-shaped leaves with a minty smell when crushed and small purple flowers in spring. The plant forms dense mats across shaded soil.

Apply broadleaf herbicides in autumn or spring when ground ivy is actively growing. Improve sunlight and drainage to make conditions less favourable.

Pros:

• Herbicides effective
• Distinctive minty smell
• Controllable with timing
• Well documented
• Multiple products exist
• Sunlight reduces it
• Predictable spread

Cons:

• Spreads by rooting stems
• Thrives in shade
• Hard to fully eradicate

13. Spurge (Euphorbia maculata) – Common Weeds In Alabama Lawns

Spurge is one of the common weeds in Alabama lawns during hot, dry summers when it forms flat mats across thin turf. It spreads by seed and by rooting stems that creep along the soil surface.

Identification is by the small, oval leaves with a red spot in the centre and milky sap when stems are broken. The plant hugs the ground and spreads quickly.

Apply broadleaf herbicides in early summer when spurge is young and actively growing. Maintain thick turf to prevent germination in the first place.

Pros:

• Herbicides effective
• Distinctive red spot
• Controllable when young
• Well documented
• Thick turf prevents it
• Multiple products exist
• Predictable season

Cons:

• Spreads rapidly
• Reseeds heavily
• Thrives in thin turf

14. Lespedeza (Lespedeza spp.) – Common Weeds In Alabama Lawns

Lespedeza is one of the common weeds in Alabama lawns because it spreads by seed and creeping stems across thin, dry turf. It is a warm-season perennial that becomes more aggressive each year.

Identification is by the three-lobed leaves with a distinctive upright growth habit and small purple flowers in late summer. The plant forms dense patches that crowd out turfgrass.

Apply broadleaf herbicides in early summer when lespedeza is young and actively growing. Repeat treatments over two seasons to exhaust the seed bank.

Pros:

• Herbicides effective
• Distinctive three-lobed leaves
• Controllable when young
• Well documented
• Multiple products exist
• Predictable season
• Treatable with persistence

Cons:

• Spreads by creeping stems
• Reseeds heavily
• Returns in thin turf

15. Bahiagrass (Paspalum notatum) – Common Weeds In Alabama Lawns

Bahiagrass is one of the common weeds in Alabama lawns where it invades fine-textured turf with coarse, low-growing clumps. It spreads by both seed and short rhizomes and tolerates poor soil better than most lawn grasses.

Identification is by the coarse, light green blades with a distinctive V-shaped seed head on tall stems. The plant grows faster than most lawn grasses and forms unsightly patches.

Apply selective post-emergent herbicides in late spring and again in late summer. Dig out individual clumps for smaller infestations.

Pros:

• Herbicides available
• Distinctive seed heads
• Digging removes clumps
• Well documented
• Multiple treatment windows
• Predictable growth
• Controllable with persistence

Cons:

• Spreads by rhizomes
• Tolerates poor soil
• Hard to fully eradicate

16. Prostrate Spurge (Euphorbia prostrata) – Common Weeds In Alabama Lawns

Prostrate spurge is one of the common weeds in Alabama lawns during hot, dry summers when it forms flat mats across thin turf. It spreads by seed and rooting stems that hug the soil surface.

Identification is by the small oval leaves with a red spot and milky sap, growing close to the ground. The plant reseeds aggressively in hot weather.

Apply broadleaf herbicides in early summer when spurge is young. Maintain dense turf to prevent germination and spread.

Pros:

• Herbicides effective
• Distinctive red spot
• Controllable when young
• Well documented
• Thick turf prevents it
• Multiple products exist
• Predictable season

Cons:

• Spreads rapidly
• Reseeds heavily
• Thrives in thin turf

17. Knotweed (Polygonum spp.) – Common Weeds In Alabama Lawns

Knotweed is one of the common weeds in Alabama lawns where turfgrass thins in compacted soil or along driveways. It is a summer annual that spreads quickly by seed and forms dense, low mats.

Identification is by the wiry stems with small, jointed leaves and tiny pink or white flowers. The plant grows flat and resists mowing.

Apply broadleaf herbicides in early summer when knotweed is young and actively growing. Aerate compacted soil to make conditions less favourable.

Pros:

• Herbicides effective
• Annual, easy to kill
• Controllable when young
• Well documented
• Aeration helps
• Multiple products exist
• Predictable season

Cons:

• Reseeds quickly
• Resists mowing
• Returns in thin turf

18. Ragweed (Ambrosia artemisiifolia) – Common Weeds In Alabama Lawns

Ragweed is one of the common weeds in Alabama lawns because it grows quickly in summer and produces vast quantities of allergenic pollen. It thrives in thin turf, disturbed soil, and roadside edges.

Identification is by the deeply lobed leaves on upright stems and the small green flower spikes at the top. The plant grows tall and releases pollen in late summer.

Apply broadleaf herbicides before plants flower to prevent seed production. Mow regularly to prevent flowering when plants are small.

Pros:

• Herbicides effective
• Distinctive lobed leaves
• Mowing prevents seed
• Well documented
• Multiple products exist
• Predictable season
• Controllable with timing

Cons:

• Allergenic pollen
• Grows tall quickly
• Reseeds aggressively

19. Common Purslane (Portulaca oleracea) – Common Weeds In Alabama Lawns

Common purslane is one of the common weeds in Alabama lawns during hot summer months when it spreads rapidly across thin turf and garden beds. It is a succulent annual that reseeds heavily and tolerates drought.

Identification is by the thick, fleshy reddish stems with small oval leaves and tiny yellow flowers. The plant grows flat and spreads by both seed and stem fragments.

Apply broadleaf herbicides in early summer when purslane is young and actively growing. Hand-pull mature plants and remove them, since stems reroot readily.

Pros:

• Herbicides effective
• Distinctive fleshy stems
• Controllable when young
• Well documented
• Hand-pulling works
• Multiple products exist
• Predictable season

Cons:

• Reroot from fragments
• Reseeds heavily
• Tolerates drought

20. Yellow Woodsorrel (Oxalis stricta) – Common Weeds In Alabama Lawns

Yellow woodsorrel is one of the common weeds in Alabama lawns because it spreads by both seed and creeping rhizomes that survive most control efforts. It thrives in thin turf, garden beds, and shaded areas.

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Identification is by the three heart-shaped leaflets resembling clover and small yellow flowers on upright stems. The plant produces seed pods that burst open when ripe.

Apply broadleaf herbicides in spring and again in autumn when woodsorrel is actively growing. Hand-pull small infestations before seed pods mature.

Pros:

• Herbicides effective
• Distinctive clover-like leaves
• Controllable with timing
• Well documented
• Hand-pulling works
• Multiple products exist
• Predictable season

Cons:

• Rhizomes persist
• Seed pods burst open
• Hard to fully eradicate

How To Identify Common Weeds In Alabama Lawns

Check the growth habit first — Grassy weeds like crabgrass and dallisgrass grow in clumps or spread by runners, while broadleaf weeds like clover and chickweed have distinct leaves and flowers.

Note the season — Winter annuals like henbit and chickweed appear in cool months, while summer annuals like crabgrass and spurge dominate in heat. Season narrows the identification quickly.

Look for distinctive features — Milky sap indicates spurge, triangular stems indicate nutsedge, and onion smell indicates wild garlic. These clues confirm the species fast.

Examine seed heads — Grassy weeds produce distinctive seed heads that help separate species. Crabgrass has finger-like seed heads while dallisgrass branches into a Y shape.

Check the soil underneath — Weeds reveal soil problems. Nutsedge and chickweed indicate wet, compacted soil, while clover and lespedeza signal low nitrogen.

Ask your county extension office — Alabama Cooperative Extension System provides free weed identification for homeowners and specific control recommendations for your region.

Photograph and compare — Take clear photos of leaves, flowers, and growth habit, then compare them against extension publications or weed identification apps for confirmation.

Common Weeds In Alabama Lawns FAQs

1. What are the most common weeds in Alabama lawns?

Crabgrass, dallisgrass, Bermuda grass, nutsedge, chamberbitter, henbit, chickweed, annual bluegrass, Florida betony, wild onion, white clover, ground ivy, spurge, lespedeza, bahiagrass, prostrate spurge, knotweed, ragweed, purslane, and yellow woodsorrel are the most common weeds in Alabama lawns.

2. What is the best time to treat weeds in Alabama?

Apply pre-emergent herbicides in early spring for summer annuals and in late summer for winter annuals. Post-emergent products work best in spring and autumn when weeds are actively growing.

3. Why does my Alabama lawn have so many weeds?

Thin turf, compacted soil, poor drainage, and low mowing heights all encourage weeds. Improving turf density and soil health is the most effective long-term weed control.

4. What kills crabgrass in Alabama lawns?

Pre-emergent herbicides applied before germination are the most effective crabgrass control. Post-emergent options work on young plants but not on mature clumps.

5. How do I get rid of nutsedge in Alabama?

Apply halosulfuron-based herbicides when nutsedge is actively growing and repeat every six to eight weeks. Improving drainage prevents the wet conditions nutsedge prefers.

6. What is the best grass for Alabama lawns?

Bermuda grass, centipede grass, St. Augustine grass, and zoysia grass are the most common lawn grasses in Alabama. Choose based on sunlight, soil, and maintenance preferences.

7. When should I apply pre-emergent herbicide in Alabama?

Apply pre-emergent herbicide when soil temperatures reach 55°F in spring for summer annuals, and again in late summer for winter annuals. Timing varies by region within the state.

Conclusion

In conclusion, crabgrass is the most common weeds in Alabama lawns because it thrives in hot, dry conditions and spreads rapidly by seed. Dallisgrass takes second place, returning every spring with deep-rooted clumps that resist most herbicides.

For winter annuals, henbit, chickweed, and annual bluegrass dominate cool-season lawns. For summer annuals, crabgrass, chamberbitter, and spurge cause the most trouble. For perennials, nutsedge, dallisgrass, and Florida betony persist year after year without consistent treatment.

Start by identifying the weeds you actually have, then match your control method to each species’ growth habit and life cycle. Thick, healthy turf combined with well-timed herbicides keeps Alabama lawns weed-free with far less effort than rescue treatments.