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Choosing an effective hi yield weed killer requires distinguishing between products designed to eradicate every green shoot and formulas engineered to protect established turfgrass. Homeowners frequently run into trouble by treating an entire yard with a total vegetation killer, resulting in large patches of dead grass alongside targeted weeds. To avoid catastrophic lawn damage, property owners must understand the operational boundary between non-selective systemic herbicides, selective post-emergent lawn sprays, and granular pre-emergent barriers before loading a tank sprayer or spreader.
The Hi-Yield herbicide catalog is organized into three defined functional categories: non-selective liquid concentrates for total vegetation removal, selective amine formulas for broadleaf weed management in established turf, and granular pre-emergents that block seed germination in garden beds and lawns. Within the non-selective segment, options diverge between fast-drying standard concentrates, long-lasting soil sterilants for extended bare-ground control, and high-volume acreage containers. Deciding which hi-yield weed killer to buy depends on whether your project involves clearing fence lines, treating broadleaf weeds in pastures, or halting crabgrass before it sprouts.
Hi-Yield Weed Killers Lineup at a Glance
Best for: Acreage operators clearing extensive fence lines
Pros
- Reaches roots in 1 to 2 hours
- Visible results in as little as 3 hours
- High-capacity 2.5-gallon bulk size
Cons
- Heavy 25.6-pound container
- Requires standalone spray equipment
Best for: Rural landowners seeking year-long bare ground
Pros
- Prevents regrowth for up to 1 year
- Treats up to 17,200 square feet
- Controls brush, vines, and broadleaf weeds
Cons
- Strictly prohibited on lawn turf
- Halts replanting for an entire year
Best for: Gardeners preventing crabgrass and annual weeds
Pros
- Covers up to 5,000 square feet
- Applies up to 4 weeks later than rivals
- Safe for turf and ornamental beds
Cons
- Will not kill emerged mature weeds
- Requires mechanical granular spreader
Best for: Property owners removing lawn broadleaf weeds
Pros
- Safe for established lawns and pastures
- Controls dandelions, asters, and buckhorn
- Approved for drainage ditches and ponds
Cons
- Spreader sticker sold separately
- Does not control grassy weeds
Best for: Suburban homeowners spot-treating driveway borders
Pros
- Covers up to 6,400 square feet
- Fast-drying double-surfactant formula
- Lightweight 2.6-pound container
Cons
- Sprayer not included
- Unsafe for desirable lawn turf
Best for: Homeowners clearing large non-lawn areas
Pros
- Treats up to 25,600 square feet
- Glyphosate 41% super concentrate
- Fast-drying double-surfactant formula
Cons
- Spraying accessory required
- Cannot be used on lawns
| Model & Size | Herbicide Type | Target Vegetation | Coverage Area |
|---|---|---|---|
| Hi-Yield (33693) Killzall 1 gal | Non-selective liquid concentrate | Grasses, broadleaf weeds, woody brush | Up to 25,600 sq ft |
| Hi-Yield (33692) Killzall 32 oz | Non-selective liquid concentrate | Grasses, broadleaf weeds, brush species | Up to 6,400 sq ft |
| Hi-Yield (21416) 2,4-D Selective 1 gal | Selective broadleaf post-emergent | Dandelions, asters, arrowhead, buckhorn | Varies by label application rate |
| Hi-Yield (33030) Weed & Grass Stopper 12 lbs | Selective pre-emergent granular | Crabgrass, annual grasses, broadleaf weeds | Up to 5,000 sq ft |
| Hi-Yield (32171) Killzall 365 1 gal | Total vegetation & residual barrier | Grasses, broadleaf weeds, vines, brush | Up to 17,200 sq ft |
| Hi-Yield (33701) Killzall II 2.5 gal | Fast-acting non-selective concentrate | Annual/perennial grasses, weeds, brush | Broad acreage coverage |
The Models in Detail
Hi-Yield (33693) Super Concentrate Killzall Weed & Grass Killer, 1 gal Weed killer controls grasses, broadleaf weeds and woody brush species
Check price on Amazon Our score: 8.2/10
The 1-gallon Hi-Yield Super Concentrate Killzall Weed & Grass Killer is formulated with 41 percent glyphosate to provide complete root-level control of unwanted vegetation. According to the listing, it eliminates grasses, broadleaf weeds, and woody brush species across non-lawn zones. The solution incorporates a double-surfactant formulation designed to dry on the foliage rapidly, which accelerates product uptake. The manufacturer explicitly states not to use this product on lawns, as the active herbicide will eradicate desirable lawn grass along with weeds.
A single 1-gallon bottle of this hi-yield super concentrate liquid treats up to 25,600 square feet when diluted according to label directions. A separate spraying accessory is required for application, as the container ships as an unpressurized concentrate. The formula enters through the leaf tissue and translocates directly to the root structure, making it effective for total site prep, edging along foundations, and clearing unplanted zones. The listing specifies an item weight of 10 pounds for this 128-fluid-ounce volume.
This gallon jug is best suited for serious DIY property owners handling seasonal fence line maintenance, driveway gravel upkeep, or large garden plot clearing. When managing smaller residential walkways where storing a 10-pound jug is inconvenient, the 32-ounce version provides identical chemistry in a more compact size. If prolonged bare ground is the objective rather than standard systemic clearing, Killzall 365 serves as the appropriate alternative.
Hi-Yield (33692) Super Concentrate Killzall Weed & Grass Killer (32 oz) Weed killer controls grasses, broadleaf weeds and woody brush species
Check price on Amazon Our score: 9.4/10
Delivering identical chemical potency in a smaller footprint, the 32-ounce Hi-Yield Super Concentrate Killzall Weed & Grass Killer provides 41 percent glyphosate designed to kill weeds and grasses down to the root. Like its 1-gallon sibling, it features a double-surfactant formulation that dries fast on plant surfaces to accelerate activity. The listing emphasizes that this product controls grasses, broadleaf weeds, and woody brush species, with strict instructions not to apply it across home lawns.
This 32-ounce bottle treats up to 6,400 square feet, making it an ideal volume for standard residential lots. Application requires a spraying accessory such as a handheld pump sprayer. Homeowners frequently use this size for tight perimeter treatments along patios and fence rows before cleaning up stray edges with a dewalt 20v max string trimmer, avoiding the need to lift and store heavy multi-gallon bulk containers.
This product suits suburban homeowners who need routine spot-treatment capability for paver seams, mulch borders, and driveway cracks. It gives way to the 1-gallon container when total square footage exceeds 6,400 square feet, and it gives way to selective 2,4-D amine whenever weed infestations occur inside established turf that must be protected.
Hi-Yield (21416) 2,4-D Selective Weed Killer, 1 gal Works on Dandelion, Arrowhead, Buckhorn, Aster, Goatsbeard and more
Check price on Amazon Our score: 8.2/10
Addressing the core difference in selective vs non selective weed killer applications, the 1-gallon Hi-Yield 2,4-D Selective Weed Killer targets invasive broadleaf plants without damaging desirable grasses. The active 2,4-D amine selective herbicide controls susceptible broadleaf species including dandelions, arrowhead, buckhorn, aster, and goatsbeard. The product label provides application guidelines for broadcast spraying across turf areas where grass survival is paramount.
According to the product specifications, this selective herbicide is approved for use on established lawns, pastures, rangelands, drainage ditches, and ponds. The listing highlights that it pairs great with Hi-Yield Spreader Sticker (31063) to enhance chemical adherence to slick leaf surfaces. Packaged in a 1-gallon liquid concentrate jug, it provides substantial broadleaf coverage for acreage operators and rural landowners maintaining expansive turf or grazing fields.
This model is the definitive choice for homeowners who want to remove dandelions and broadleaf weeds from their lawn without destroying the turf canopy. It gives way to non-selective hi-yield killzall formulas when treating driveways and non-crop ground where all plant life must be eliminated, and it gives way to pre-emergents when the objective is stopping weed seeds before germination occurs.
Hi-Yield (33030) Turf & Ornamental Weed & Grass Stopper, 12 lbs Provides superior control of Crabgrass and many other annual grass and
Check price on Amazon Our score: 8.4/10
Taking a preventative stance against weed infestations, the 12-pound bag of Hi-Yield Turf & Ornamental Weed & Grass Stopper utilizes granular Oryzalin chemistry to intercept weeds before emergence. The listing states that this product delivers superior control of crabgrass alongside many other annual grasses and broadleaf weed varieties. Rather than killing existing growth, this pre-emergent establishes a chemical barrier in the topsoil that halts seedling development as dormant seeds begin to sprout.
A single 12-pound bag covers up to 5,000 square feet of established lawns, ornamental landscape areas, and ornamental turf. The listing specifies that this formula can be applied up to 4 weeks later than competing pre-emergent crabgrass products while maintaining dependable efficacy. For best results, the manufacturer advises applying the granules within a few days of mowing, ensuring uniform contact with the soil surface.
This granular barrier is designed for landscapers and homeowners aiming to keep garden beds and lawn perimeters free of annual invaders. After refreshing landscape edging with fresh weed wacker string craftsman line, applying this pre-emergent barrier prevents seasonal crabgrass from taking over the cut borders. It gives way to liquid post-emergents like 2,4-D or Killzall once weeds have already germinated and emerged above the soil line.
Hi-Yield (32171) Killzall 365, 1 gal Controls unwanted weeds and other vegetation on non-crop/no-vegetation areas
Check price on Amazon Our score: 9.2/10
When long-term total vegetation clearing is required, the 1-gallon Hi-Yield Killzall 365 delivers extended control by blending glyphosate with imazapic. The listing explains that this dual-action formula kills unwanted broadleaf weeds, grasses, trees, brush, and vines while establishing a residual barrier that prevents plant regrowth for up to 1 year. The manufacturer explicitly marks this product for non-crop and no-vegetation areas, with an absolute warning not to use it on lawns.
One gallon of this liquid concentrate treats up to 17,200 square feet for bare-ground management. The listing details specific mixing ratios: 6 ounces of concentrate per 1 gallon of water for spot control of aggressive brush and vines, or 7.4 ounces mixed with 1 to 10 gallons of water for total vegetation control where complete bare ground is desired. The active residual remains bound to the upper soil layers, neutralizing emerging seedlings across all four seasons.
This formulation suits property owners managing gravel parking areas, outbuilding perimeters, storage lots, and bare-ground equipment yards. Because it sterilizes the treated ground against plant growth for an entire year, it gives way to standard standard Hi-Yield Killzall whenever the user intends to replant or seed the area in upcoming months.
Hi-Yield (33701) Super Concentrate Killzall II, 2.5 gal Can be used to control weeds and grass in Round-Up Ready crops
Check price on Amazon Our score: 8.6/10
Engineered for high-volume jobs, the 2.5-gallon Hi-Yield Super Concentrate Killzall II packs 41 percent glyphosate into a heavy-duty container weighing 25.6 pounds. The listing highlights rapid absorption, stating that the formula reaches the root system in 1 to 2 hours and produces visible results in as little as 3 hours. It controls annual and perennial grasses, broadleaf weeds, and woody brush species, and the listing warns that it must not be applied to lawns.
This high-capacity concentrate is suited for use around trees, flower beds, buildings, driveways, and sidewalks, as well as for weed control in Round-Up Ready crops according to the label crop list. A separate spraying accessory is required to dilute and apply the concentrate. Rural managers maintaining long road frontages often alternate chemical spraying with mechanical clearing using tools like the works weedeater, using Killzall II to eliminate thick woody brush that would rapidly wear down trimming line.
This 2.5-gallon bulk unit is built specifically for acreage operators, farmers, and commercial groundskeepers who require rapid visible knockdown and large volume. It gives way to the smaller 1-gallon or 32-ounce Killzall concentrates for residential properties where storing and pouring a 25.6-pound container is impractical.
Matching a Model to Your Setup
- For eradicating dandelions and broadleaf weeds directly within established lawn turf, use Hi-Yield (21416) 2,4-D Selective Weed Killer to eliminate weeds without damaging desirable grass blades.
- For maintaining gravel driveways, equipment yards, and fence rows where absolute bare ground is needed with zero regrowth for an entire season, apply Hi-Yield (32171) Killzall 365.
- For early spring prevention of crabgrass and annual broadleaf weeds in landscape beds and established turf, spread Hi-Yield (33030) Turf & Ornamental Weed & Grass Stopper granules before seeds germinate.
- For spot-treating weeds along residential patio pavers, sidewalks, and foundation perimeters without storing heavy concentrate jugs, choose the 32-ounce Hi-Yield (33692) Super Concentrate Killzall.
- For broad-acreage vegetation clearing, farm road maintenance, and rapid 3-hour knockdown of thick brush, deploy Hi-Yield (33701) Super Concentrate Killzall II in the 2.5-gallon bulk jug.
- For large garden plot clearing and non-lawn property renovation covering up to 25,600 square feet, apply 1-gallon Hi-Yield (33693) Super Concentrate Killzall.
Before You Buy
Operating these weed control products requires supplementary hardware that does not come inside the box. Every liquid concentrate in the Hi-Yield lineup—including both Killzall super concentrates, Killzall 365, and 2,4-D Selective—requires a dedicated spraying accessory such as a handheld pump sprayer, backpack sprayer, or tow-behind tank. Similarly, the Turf & Ornamental Weed & Grass Stopper requires a mechanical broadcast or drop spreader to achieve the specified 5,000-square-foot coverage rate. Personal protective equipment, measuring cups, and calibration buckets are not included with any of these models.
The product listings also omit certain operational variables that users must verify on the physical container labels before spraying. The listings do not specify exact water pH parameters, minimum ambient application temperatures, or full livestock grazing restrictions for pastures treated with 2,4-D. While the Killzall super concentrate formulas include built-in surfactants, the 2,4-D Selective listing notes that pairing it with Hi-Yield Spreader Sticker improves leaf coverage, which must be purchased separately. Always read the complete peel-back manufacturer label on the physical bottle for precise dilution ratios, safety intervals, and crop restrictions prior to mixing.
FAQ
Will Hi-Yield Killzall kill my lawn grass?
Yes. Hi-Yield Killzall formulas contain 41 percent glyphosate, which is a non-selective herbicide. It destroys any green plant tissue it contacts, including desirable lawn grasses such as fescue, bluegrass, and Bermuda. The manufacturer explicitly includes warnings on the listing not to use these products on lawns unless you intend to completely kill the entire turf area for total renovation.
What is the difference between selective vs non selective weed killer?
A selective herbicide, such as Hi-Yield 2,4-D Selective, targets specific plant categories like broadleaf weeds while leaving established grasses unharmed when applied according to the label. A non-selective herbicide, such as Hi-Yield Killzall, attacks all green vegetation indiscriminately, killing both turfgrass and broadleaf plants down to the root structure.
How does Hi-Yield Killzall 365 differ from standard Killzall?
Standard Hi-Yield Killzall eliminates existing weeds and grasses to the root using glyphosate, allowing the area to be replanted after the chemical breaks down. Hi-Yield Killzall 365 pairs glyphosate with imazapic to provide extended control, creating a soil barrier that prevents weed seeds and new vegetation from growing for up to a full year on non-crop areas.
When is the best time to apply Hi-Yield Turf & Ornamental Weed & Grass Stopper?
This granular pre-emergent should be applied before weed seeds germinate, typically in early spring for crabgrass control. The product listing states that it provides superior control when applied within a few days of mowing, and its unique formulation allows application up to 4 weeks later than many competing crabgrass pre-emergents.
Do Hi-Yield weed killers require additional surfactant?
The standard Killzall and Killzall II super concentrate listings state that they feature a double-surfactant formulation that dries quickly on the plant, meaning additional surfactant is generally unnecessary. In contrast, the Hi-Yield 2,4-D Selective listing specifically notes that it pairs great with Hi-Yield Spreader Sticker, which helps the herbicide spread evenly and adhere to waxy weed leaves.