How does the LawnWeedIdentifier.com herbicide matrix prevent lawn damage?

Our diagnostic engine separates botanical identification from chemical selection. Once a weed species is identified, our backend deterministically cross-references EPA-registered herbicides against your exact turfgrass species (e.g., Kentucky Bluegrass vs. St. Augustine) and air temperature thresholds in degrees Fahrenheit.

Why can't I use standard 2,4-D or Quinclorac weed killers on all lawn types?

Warm-season grasses such as St. Augustinegrass and Centipedegrass suffer severe chlorosis and stolon death from Quinclorac and high-rate 2,4-D esters, requiring Atrazine or Celsius WG instead.

US Lawn Weed Identifier & Selective Herbicide Compatibility Matrix

Identify any US lawn weed from a photo and cross-reference EPA-registered selective herbicides that eliminate the weed without injuring your specific cool-season or warm-season turfgrass.

1. Interactive AI Lawn Weed Scanner

Step 1: Select Your Desirable Lawn Grass Type

Step 2: Upload or Snap a Clear Photo of the Weed

Click to select photo or drag & drop here

Client-side Canvas WebP compression (max 1024px) for instant diagnostic upload

Deterministic Turf Safety Architecture

Botanical Taxonomy Only: Vision AI identifies morphological markers (vernation, ligule, stem cross-section) and matches one of 40 US weeds.
Zero Hallucinated Chemicals: Safe herbicides, temperature limits (°F), and surfactants are matched deterministically from our verified EPA database.
Warm-Season Turf Protection: Automatically blocks 2,4-D, Quinclorac, and Fenoxaprop on sensitive St. Augustine and Centipede lawns.

2. Selective Herbicide Safety Guides by Lawn Grass Type (8 US Turf Species)

Select your lawn grass below to view its complete selective herbicide compatibility matrix, temperature phytotoxicity ceilings, and forbidden active ingredients.

Kentucky Bluegrass

Cool-Season • 8 Labeled Safe Herbicides

Tall Fescue

Cool-Season • 8 Labeled Safe Herbicides

Perennial Ryegrass

Cool-Season • 8 Labeled Safe Herbicides

Bermudagrass

Warm-Season • 7 Labeled Safe Herbicides

St. Augustinegrass

Warm-Season • 6 Labeled Safe Herbicides

Zoysiagrass

Warm-Season • 10 Labeled Safe Herbicides

Centipedegrass

Warm-Season • 8 Labeled Safe Herbicides

Bahiagrass

Warm-Season • 4 Labeled Safe Herbicides

3. Complete US Lawn Weed Diagnostic Catalog (40 Species)

Browse all 40 grassy, broadleaf, and sedge weeds with botanical lookalike comparisons and Answer-First chemical control protocols.

Smooth & Large Crabgrass

Digitaria ischaemum / Digitaria sanguinalis
Grassy • Summer Annual

Common Dandelion

Taraxacum officinale
Broadleaf • Perennial

Yellow Nutsedge

Cyperus esculentus
Sedge • Perennial

White Dutch Clover

Trifolium repens
Broadleaf • Perennial

Creeping Charlie (Ground Ivy)

Glechoma hederacea
Broadleaf • Perennial

Goosegrass (Silver Crabgrass)

Eleusine indica
Grassy • Summer Annual

Nimblewill

Muhlenbergia schreberi
Grassy • Perennial

Creeping Bentgrass (Weedy Invasions)

Agrostis stolonifera
Grassy • Perennial

Broadleaf Plantain

Plantago major
Broadleaf • Perennial

Buckhorn Plantain (Narrowleaf Plantain)

Plantago lanceolata
Broadleaf • Perennial

Henbit

Lamium amplexicaule
Broadleaf • Winter Annual

Common Chickweed

Stellaria media
Broadleaf • Winter Annual

Mouse-ear Chickweed

Cerastium fontanum
Broadleaf • Perennial

Purple Deadnettle

Lamium purpureum
Broadleaf • Winter Annual

Black Medic

Medicago lupulina
Broadleaf • Summer Annual / Perennial

Carpetweed

Mollugo verticillata
Broadleaf • Summer Annual

Wild Violet

Viola sororia
Broadleaf • Perennial

Yellow Woodsorrel (Oxalis)

Oxalis stricta
Broadleaf • Perennial

Common Purslane

Portulaca oleracea
Broadleaf • Summer Annual

Common Lambsquarters

Chenopodium album
Broadleaf • Summer Annual

Shepherd's Purse

Capsella bursa-pastoris
Broadleaf • Winter Annual

Yellow Foxtail

Setaria pumila
Grassy • Summer Annual

Barnyardgrass

Echinochloa crus-galli
Grassy • Summer Annual

Broadleaf Signalgrass

Urochloa platyphylla
Grassy • Summer Annual

Dollarweed (Pennywort)

Hydrocotyle umbellata
Broadleaf • Perennial

Field Bindweed

Convolvulus arvensis
Broadleaf • Perennial

English Daisy

Bellis perennis
Broadleaf • Perennial

Corn Speedwell

Veronica arvensis
Broadleaf • Winter Annual

Torpedograss

Panicum repens
Grassy • Perennial

Green Kyllinga

Kyllinga brevifolia
Sedge • Perennial

Field Horsetail

Equisetum arvense
Broadleaf • Perennial

Virginia Buttonweed

Diodia virginiana
Broadleaf • Perennial

Canada Thistle

Cirsium arvense
Broadleaf • Perennial

Curly Dock

Rumex crispus
Broadleaf • Perennial

Prostrate Knotweed

Polygonum aviculare
Broadleaf • Summer Annual

Common Lespedeza (Japanese Clover)

Kummerowia striata
Broadleaf • Summer Annual

Common Ragweed

Ambrosia artemisiifolia
Broadleaf • Summer Annual

Common Mallow

Malva neglecta
Broadleaf • Annual / Biennial

Annual Bluegrass (Poa Annua)

Poa annua
Grassy • Winter Annual

Dallisgrass

Paspalum dilatatum
Grassy • Perennial

4. High-Risk Weed-in-Turf Agronomic Conflict Guides

Direct treatment protocols for the most challenging weed and grass combinations where standard retail weed killers cause severe turf injury.

Kill Smooth & Large Crabgrass in Kentucky Bluegrass

5 Safe Options • 1 Products to Avoid

Kill Smooth & Large Crabgrass in Tall Fescue

5 Safe Options • 1 Products to Avoid

Kill Smooth & Large Crabgrass in St. Augustinegrass

2 Safe Options • 4 Products to Avoid

Kill Smooth & Large Crabgrass in Bermudagrass

2 Safe Options • 4 Products to Avoid

Kill Common Dandelion in Kentucky Bluegrass

5 Safe Options • 1 Products to Avoid

Kill Common Dandelion in Tall Fescue

5 Safe Options • 1 Products to Avoid

Kill Common Dandelion in St. Augustinegrass

1 Safe Options • 5 Products to Avoid

Kill Yellow Nutsedge in Kentucky Bluegrass

3 Safe Options • 2 Products to Avoid

Kill Yellow Nutsedge in Tall Fescue

3 Safe Options • 2 Products to Avoid

Kill Yellow Nutsedge in Bermudagrass

3 Safe Options • 2 Products to Avoid

Kill Yellow Nutsedge in St. Augustinegrass

3 Safe Options • 2 Products to Avoid

Kill White Dutch Clover in Kentucky Bluegrass

5 Safe Options • 2 Products to Avoid

Kill White Dutch Clover in Tall Fescue

5 Safe Options • 2 Products to Avoid

Kill White Dutch Clover in St. Augustinegrass

2 Safe Options • 5 Products to Avoid

Kill White Dutch Clover in Centipedegrass

4 Safe Options • 3 Products to Avoid

Kill Creeping Charlie (Ground Ivy) in Kentucky Bluegrass

4 Safe Options • 0 Products to Avoid

Kill Creeping Charlie (Ground Ivy) in Tall Fescue

4 Safe Options • 0 Products to Avoid

Kill Creeping Charlie (Ground Ivy) in Perennial Ryegrass

4 Safe Options • 0 Products to Avoid

Kill Goosegrass (Silver Crabgrass) in Kentucky Bluegrass

4 Safe Options • 0 Products to Avoid

Kill Goosegrass (Silver Crabgrass) in Tall Fescue

4 Safe Options • 0 Products to Avoid

Kill Goosegrass (Silver Crabgrass) in Bermudagrass

1 Safe Options • 3 Products to Avoid

Kill Nimblewill in Kentucky Bluegrass

2 Safe Options • 0 Products to Avoid

Kill Nimblewill in Tall Fescue

2 Safe Options • 0 Products to Avoid

Kill Nimblewill in Perennial Ryegrass

2 Safe Options • 0 Products to Avoid

Kill Creeping Bentgrass (Weedy Invasions) in Kentucky Bluegrass

1 Safe Options • 0 Products to Avoid

Kill Creeping Bentgrass (Weedy Invasions) in Tall Fescue

1 Safe Options • 0 Products to Avoid

Kill Creeping Bentgrass (Weedy Invasions) in Perennial Ryegrass

1 Safe Options • 0 Products to Avoid

Kill Broadleaf Plantain in Kentucky Bluegrass

3 Safe Options • 1 Products to Avoid

Kill Broadleaf Plantain in Tall Fescue

3 Safe Options • 1 Products to Avoid

Kill Broadleaf Plantain in St. Augustinegrass

1 Safe Options • 3 Products to Avoid

Kill Broadleaf Plantain in Bermudagrass

2 Safe Options • 2 Products to Avoid

Kill Buckhorn Plantain (Narrowleaf Plantain) in Kentucky Bluegrass

3 Safe Options • 1 Products to Avoid

Kill Buckhorn Plantain (Narrowleaf Plantain) in Tall Fescue

3 Safe Options • 1 Products to Avoid

Kill Buckhorn Plantain (Narrowleaf Plantain) in Zoysiagrass

3 Safe Options • 1 Products to Avoid

Kill Henbit in Kentucky Bluegrass

4 Safe Options • 3 Products to Avoid

Kill Henbit in Tall Fescue

4 Safe Options • 3 Products to Avoid

Kill Henbit in Bermudagrass

4 Safe Options • 3 Products to Avoid

Kill Henbit in Zoysiagrass

6 Safe Options • 1 Products to Avoid

Kill Common Chickweed in Kentucky Bluegrass

4 Safe Options • 3 Products to Avoid

Kill Common Chickweed in Tall Fescue

4 Safe Options • 3 Products to Avoid

Kill Common Chickweed in Perennial Ryegrass

4 Safe Options • 3 Products to Avoid

Kill Mouse-ear Chickweed in Kentucky Bluegrass

2 Safe Options • 0 Products to Avoid

Kill Mouse-ear Chickweed in Tall Fescue

2 Safe Options • 0 Products to Avoid

Kill Purple Deadnettle in Kentucky Bluegrass

3 Safe Options • 0 Products to Avoid

Kill Purple Deadnettle in Tall Fescue

3 Safe Options • 0 Products to Avoid

Kill Purple Deadnettle in Bermudagrass

1 Safe Options • 2 Products to Avoid

Kill Black Medic in Kentucky Bluegrass

4 Safe Options • 1 Products to Avoid

Kill Black Medic in Tall Fescue

4 Safe Options • 1 Products to Avoid

Kill Black Medic in St. Augustinegrass

1 Safe Options • 4 Products to Avoid

Kill Carpetweed in Kentucky Bluegrass

3 Safe Options • 2 Products to Avoid

Kill Carpetweed in Tall Fescue

3 Safe Options • 2 Products to Avoid

Kill Carpetweed in Bermudagrass

3 Safe Options • 2 Products to Avoid

Kill Wild Violet in Kentucky Bluegrass

3 Safe Options • 0 Products to Avoid

Kill Wild Violet in Tall Fescue

3 Safe Options • 0 Products to Avoid

Kill Wild Violet in Perennial Ryegrass

3 Safe Options • 0 Products to Avoid

Kill Yellow Woodsorrel (Oxalis) in Kentucky Bluegrass

3 Safe Options • 2 Products to Avoid

Kill Yellow Woodsorrel (Oxalis) in Tall Fescue

3 Safe Options • 2 Products to Avoid

Kill Yellow Woodsorrel (Oxalis) in St. Augustinegrass

2 Safe Options • 3 Products to Avoid

Kill Yellow Woodsorrel (Oxalis) in Zoysiagrass

4 Safe Options • 1 Products to Avoid

Kill Common Purslane in Kentucky Bluegrass

3 Safe Options • 0 Products to Avoid

Kill Common Purslane in Tall Fescue

3 Safe Options • 0 Products to Avoid

Kill Common Purslane in Bermudagrass

2 Safe Options • 1 Products to Avoid

Kill Common Lambsquarters in Kentucky Bluegrass

3 Safe Options • 0 Products to Avoid

Kill Common Lambsquarters in Tall Fescue

3 Safe Options • 0 Products to Avoid

Kill Shepherd's Purse in Kentucky Bluegrass

3 Safe Options • 0 Products to Avoid

Kill Shepherd's Purse in Tall Fescue

3 Safe Options • 0 Products to Avoid

Kill Shepherd's Purse in Perennial Ryegrass

3 Safe Options • 0 Products to Avoid

Kill Yellow Foxtail in Kentucky Bluegrass

4 Safe Options • 0 Products to Avoid

Kill Yellow Foxtail in Tall Fescue

4 Safe Options • 0 Products to Avoid

Kill Yellow Foxtail in Bermudagrass

2 Safe Options • 2 Products to Avoid

Kill Barnyardgrass in Kentucky Bluegrass

2 Safe Options • 0 Products to Avoid

Kill Barnyardgrass in Tall Fescue

2 Safe Options • 0 Products to Avoid

Kill Barnyardgrass in Bermudagrass

1 Safe Options • 1 Products to Avoid

Kill Broadleaf Signalgrass in Bermudagrass

1 Safe Options • 1 Products to Avoid

Kill Broadleaf Signalgrass in Zoysiagrass

2 Safe Options • 0 Products to Avoid

Kill Broadleaf Signalgrass in Tall Fescue

2 Safe Options • 0 Products to Avoid

Kill Dollarweed (Pennywort) in St. Augustinegrass

3 Safe Options • 2 Products to Avoid

Kill Dollarweed (Pennywort) in Centipedegrass

3 Safe Options • 2 Products to Avoid

Kill Dollarweed (Pennywort) in Bermudagrass

4 Safe Options • 1 Products to Avoid

Kill Dollarweed (Pennywort) in Zoysiagrass

5 Safe Options • 0 Products to Avoid

Kill Field Bindweed in Kentucky Bluegrass

2 Safe Options • 0 Products to Avoid

Kill Field Bindweed in Tall Fescue

2 Safe Options • 0 Products to Avoid

Kill English Daisy in Perennial Ryegrass

1 Safe Options • 0 Products to Avoid

Kill English Daisy in Kentucky Bluegrass

1 Safe Options • 0 Products to Avoid

Kill Corn Speedwell in Kentucky Bluegrass

2 Safe Options • 0 Products to Avoid

Kill Corn Speedwell in Tall Fescue

2 Safe Options • 0 Products to Avoid

Kill Corn Speedwell in Perennial Ryegrass

2 Safe Options • 0 Products to Avoid

Kill Torpedograss in St. Augustinegrass

0 Safe Options • 1 Products to Avoid

Kill Torpedograss in Centipedegrass

0 Safe Options • 1 Products to Avoid

Kill Torpedograss in Bermudagrass

1 Safe Options • 0 Products to Avoid

Kill Torpedograss in Zoysiagrass

1 Safe Options • 0 Products to Avoid

Kill Green Kyllinga in Bermudagrass

3 Safe Options • 0 Products to Avoid

Kill Green Kyllinga in St. Augustinegrass

3 Safe Options • 0 Products to Avoid

Kill Green Kyllinga in Zoysiagrass

3 Safe Options • 0 Products to Avoid

Kill Green Kyllinga in Tall Fescue

1 Safe Options • 2 Products to Avoid

Kill Field Horsetail in Kentucky Bluegrass

1 Safe Options • 0 Products to Avoid

Kill Field Horsetail in Tall Fescue

1 Safe Options • 0 Products to Avoid

Kill Virginia Buttonweed in St. Augustinegrass

1 Safe Options • 2 Products to Avoid

Kill Virginia Buttonweed in Bermudagrass

2 Safe Options • 1 Products to Avoid

Kill Virginia Buttonweed in Zoysiagrass

3 Safe Options • 0 Products to Avoid

Kill Virginia Buttonweed in Centipedegrass

1 Safe Options • 2 Products to Avoid

Kill Canada Thistle in Kentucky Bluegrass

2 Safe Options • 0 Products to Avoid

Kill Canada Thistle in Tall Fescue

2 Safe Options • 0 Products to Avoid

Kill Curly Dock in Kentucky Bluegrass

2 Safe Options • 0 Products to Avoid

Kill Curly Dock in Tall Fescue

2 Safe Options • 0 Products to Avoid

Kill Prostrate Knotweed in Kentucky Bluegrass

2 Safe Options • 0 Products to Avoid

Kill Prostrate Knotweed in Tall Fescue

2 Safe Options • 0 Products to Avoid

Kill Prostrate Knotweed in Bermudagrass

2 Safe Options • 0 Products to Avoid

Kill Common Lespedeza (Japanese Clover) in Bermudagrass

2 Safe Options • 2 Products to Avoid

Kill Common Lespedeza (Japanese Clover) in Zoysiagrass

4 Safe Options • 0 Products to Avoid

Kill Common Lespedeza (Japanese Clover) in Tall Fescue

2 Safe Options • 2 Products to Avoid

Kill Common Ragweed in Kentucky Bluegrass

1 Safe Options • 0 Products to Avoid

Kill Common Ragweed in Tall Fescue

1 Safe Options • 0 Products to Avoid

Kill Common Mallow in Kentucky Bluegrass

2 Safe Options • 0 Products to Avoid

Kill Common Mallow in Tall Fescue

2 Safe Options • 0 Products to Avoid

Kill Annual Bluegrass (Poa Annua) in Kentucky Bluegrass

1 Safe Options • 3 Products to Avoid

Kill Annual Bluegrass (Poa Annua) in Perennial Ryegrass

1 Safe Options • 3 Products to Avoid

Kill Annual Bluegrass (Poa Annua) in Bermudagrass

3 Safe Options • 1 Products to Avoid

Kill Annual Bluegrass (Poa Annua) in Zoysiagrass

4 Safe Options • 0 Products to Avoid

Kill Dallisgrass in Bermudagrass

0 Safe Options • 1 Products to Avoid

Kill Dallisgrass in Zoysiagrass

0 Safe Options • 1 Products to Avoid

Kill Dallisgrass in Tall Fescue

1 Safe Options • 0 Products to Avoid

Kill Dallisgrass in St. Augustinegrass

0 Safe Options • 1 Products to Avoid