Selective vs Non-Selective Herbicides: Choosing Right for North Texas

Walk into any hardware store in Arlington and you’ll find an entire aisle of herbicide products that all claim to kill weeds. What most homeowners don’t realize until they’ve already made a costly mistake is that there are two fundamentally different categories of herbicides — selective and non-selective — and using the wrong one on your lawn can mean killing the very grass you’re trying to protect. For North Texas lawns, which predominantly feature warm-season grasses and face weed pressure across multiple seasons, understanding this distinction is foundational to effective weed control and fertilizer programs that preserve your turf investment.

The Fundamental Difference

A selective herbicide is formulated to kill certain plant species or plant families while leaving others unharmed. It exploits biological differences between target species and desirable plants. A non-selective herbicide kills or damages all plant tissue it contacts, regardless of species. There is no biological discrimination — desirable grass, ornamentals, and target weeds are all affected.

The distinction sounds simple, but the consequences of mixing them up are significant. Applying a non-selective herbicide like glyphosate to a lawn to target nutgrass or crabgrass will create dead patches of all vegetation everywhere the product lands. Applying the wrong selective herbicide — one labeled for a different grass type than your lawn — can cause similar damage to desirable turf.

Selective Herbicides for North Texas Lawns

North Texas turf is dominated by bermudagrass and St. Augustine, with some zoysiagrass. Selective herbicide choices must account for which grass type is present, because a product safe on bermudagrass can damage or kill St. Augustine, and vice versa.

• 2,4-D, dicamba, and MCPP combinations (three-way herbicides): The most widely used selective broadleaf herbicides. They target henbit, dandelion, clover, chickweed, and many other broadleaf species. Generally safe on established bermudagrass at label rates; use with caution on St. Augustine, particularly in heat or drought stress, as phytotoxicity risk increases.
• Quinclorac: Selective post-emergent for crabgrass control in bermudagrass lawns. Not labeled for St. Augustine use without risk of turf damage.
• Atrazine: A selective pre-emergent and post-emergent product labeled specifically for St. Augustine lawns in Texas. Controls both grassy and some broadleaf weeds. Not for use on bermudagrass.
• Sulfentrazone and halosulfuron: Selective options for nutsedge (nutgrass) control on warm-season turf. Halosulfuron (Sedgehammer) is one of the most effective nutsedge products for DFW lawns.
• Dithiopyr, prodiamine, pendimethalin: Selective pre-emergents targeting annual grassy weeds while leaving established warm-season turf unharmed when applied at label rates.

Non-Selective Herbicides: When and Where They Belong

Non-selective herbicides have a legitimate role in lawn and landscape management — just not broadcast-applied over an active lawn. Appropriate uses in a North Texas yard include:

• Spot-treating individual weeds in hardscape gaps: Cracks in driveways, sidewalk edges, and fence lines where no desirable plants are present.
• Killing existing vegetation before lawn renovation or sod installation: A glyphosate application followed by a two-week waiting period is the standard preparation for a complete lawn replacement.
• Eliminating noxious perennial weeds in ornamental beds: Careful spot application with a shielded sprayer or direct wick application where the product won’t contact ornamentals.
• Killing large clumps of invasive grasses: Bahiagrass, dallisgrass, or bermudagrass invading ornamental beds or other areas where you want complete kill.

The most common non-selective herbicide homeowners encounter is glyphosate (Roundup and its many generic equivalents). Pelargonic acid products (Scythe, Burn Out) are contact-type non-selectives that kill above-ground tissue but have minimal soil activity and no residual control.

Mistakes North Texas Homeowners Commonly Make

The DFW area has some specific weed control traps that result from the selective/non-selective confusion.

• Using glyphosate on nutsedge: Nutsedge (nutgrass) is notoriously glyphosate-tolerant. Applying non-selective herbicide to nutsedge often only top-kills the plant while the underground tubers survive and re-sprout. A selective product like halosulfuron is the correct tool.
• Applying three-way broadleaf herbicides in summer heat: Temperatures above 90°F increase the volatility of dicamba and the phytotoxicity risk to St. Augustine. Many DFW homeowners damage their St. Augustine by applying broadleaf selective herbicides during a July heat wave.
• Using a bermudagrass-labeled product on St. Augustine: Products like quinclorac or image (imazaquin) that are safe on bermudagrass can cause significant injury to St. Augustine. Always match product to grass type.

Reading the Label Before Every Application

The herbicide label is a legal document and it answers the selective/non-selective question definitively for every product. Look for the section titled “Turf Species,” “Use Sites,” or “Crops and Ornamentals.” If your grass species isn’t listed as tolerant, do not apply the product to your lawn — regardless of what a neighbor or YouTube video suggests. In North Texas’s diverse grass landscape, where the same neighborhood can have bermudagrass in one yard and St. Augustine next door, verifying grass type before product selection is non-negotiable.

Why a Professional Program Removes the Guesswork

At Hamann Lawn Care & Weed Control, every product we apply is selected based on three things: what weed species we’re targeting, what grass type is in the lawn, and what the season and conditions allow. That matching process — done by licensed applicators with 20-plus years in the Tarrant County market — eliminates the risk of reaching for the wrong tool and damaging a lawn that took years to establish. Read about how rainfall further complicates product decisions in our guide to how heavy rainfall reduces pre-emergent effectiveness in DFW.