{"id":420,"date":"2026-09-25T03:00:00","date_gmt":"2026-09-25T03:00:00","guid":{"rendered":"https:\/\/totallygreenlawn.com\/?p=420"},"modified":"2026-09-23T00:48:18","modified_gmt":"2026-09-23T00:48:18","slug":"how-much-surfactant-per-gallon-of-weed-killer-mix-2","status":"publish","type":"post","link":"https:\/\/totallygreenlawn.com\/?p=420","title":{"rendered":"Surfactant Per Gallon of Weed Killer: Exact Mixing Ratios"},"content":{"rendered":"\n<script type=\"application\/ld+json\">{\"@context\":\"https:\/\/schema.org\",\"@type\":\"BlogPosting\",\"headline\":\"Surfactant Per Gallon of Weed Killer: Exact Mixing Ratios\",\"description\":\"If you've ever stared at a bottle of surfactant and a jug of concentrate wondering how much surfactant per gallon of weed killer mix you're actually\u2026\",\"datePublished\":\"2026-09-23\",\"dateModified\":\"2026-09-23\",\"mainEntityOfPage\":{\"@type\":\"WebPage\",\"@id\":\"https:\/\/totallygreenlawn.com\/how-much-surfactant-per-gallon-of-weed-killer-mix\"},\"author\":{\"@type\":\"Person\",\"name\":\"Editorial Team\"},\"publisher\":{\"@type\":\"Organization\",\"name\":\"totallygreenlawn\"}}<\/script>\n<script type=\"application\/ld+json\">{\"@context\":\"https:\/\/schema.org\",\"@type\":\"FAQPage\",\"mainEntity\":[{\"@type\":\"Question\",\"name\":\"Can I use too much surfactant?\",\"acceptedAnswer\":{\"@type\":\"Answer\",\"text\":\"Yes. Past about 1% v\/v, most herbicides show no benefit and may cause leaf burn or excessive runoff. The label range is your hard ceiling. If the label says 0.5% max, 1% is a real problem, not a \\\"more is better\\\" move.\"}},{\"@type\":\"Question\",\"name\":\"Is dish soap a safe substitute for agricultural surfactant?\",\"acceptedAnswer\":{\"@type\":\"Answer\",\"text\":\"It works in a pinch, but it&39;s unreliable. Dish soap varies in concentration, foams heavily in tank mixes, and may contain additives that damage sprayer seals over time. A real NIS costs about $15 and lasts for years. Worth the upgrade.\"}},{\"@type\":\"Question\",\"name\":\"Do I need surfactant if the label doesn&39;t mention it?\",\"acceptedAnswer\":{\"@type\":\"Answer\",\"text\":\"Not always. Some formulations (especially higher-end glyphosate concentrates like Roundup Pro) include surfactant in the jug. If the label is silent and you&39;re seeing inconsistent kill, adding 0.25% NIS is a low-risk experiment. If the label explicitly says \\\"do not add surfactant,\\\" follow that.\"}},{\"@type\":\"Question\",\"name\":\"How long does a mixed surfactant and weed killer solution stay good?\",\"acceptedAnswer\":{\"@type\":\"Answer\",\"text\":\"Same-day is best. Some herbicides start breaking down within 12 hours in the tank, especially glyphosate in alkaline water. If you must hold a mix overnight, seal the tank, store it out of direct sun, and shake thoroughly before spraying.\"}},{\"@type\":\"Question\",\"name\":\"Can I mix surfactant with liquid fertilizer and herbicide at the same time?\",\"acceptedAnswer\":{\"@type\":\"Answer\",\"text\":\"Yes, but jar-test first. Some liquid fertilizers (especially 10-10-10 blends) will curdle certain surfactants. A quick jar test prevents a ruined 4-gallon batch. For more on water quality and herbicide efficacy, the EPA&39;s Office of Pesticide Programs publishes a useful primer on adjuvant selection and tank-mix compatibility.\"}},{\"@type\":\"Question\",\"name\":\"Does surfactant rate change for spot spraying versus broadcast spraying?\",\"acceptedAnswer\":{\"@type\":\"Answer\",\"text\":\"Not really. The rate is based on the percentage of surfactant in the total spray volume, not on application method. Spot spraying just uses less total mix. Keep the 0.25% to 0.5% NIS rate the same whether you&39;re hitting one weed or spraying a full acre.\"}}]}<\/script>\n<p>If you&#39;ve ever stared at a bottle of surfactant and a jug of concentrate wondering how much surfactant per gallon of weed killer mix you&#39;re actually supposed to use, you&#39;re not alone. It&#39;s the most common question we get from homeowners and small-acreage applicators, and the honest answer is: it depends on the herbicide, the surfactant, and the weed you&#39;re targeting.<\/p>\n<p>The good news: most non-ionic surfactants land in a tight range of 0.25% to 0.5% by volume, which works out to roughly 2 teaspoons per gallon of spray mix. Manufacturer specs and university extension guidance we reviewed in 2026 confirm that&#39;s the sweet spot for the vast majority of homeowner applications. Below, we&#39;ll walk through how to dial it in for your specific situation, and where the exceptions live.<\/p>\n<p><img decoding=\"async\" src=\"https:\/\/m.media-amazon.com\/images\/I\/71cEEohd75L._AC_SL1500_.jpg\" alt=\"how much surfactant per gallon of weed killer mix\" loading=\"lazy\" style=\"max-width:100%;height:auto;display:block;margin:20px auto;border-radius:10px;\"><\/p>\n<h2>Quick Answer<\/h2>\n<p>Most homeowner mixes call for 2 to 4 teaspoons of non-ionic surfactant per gallon. That equals 0.25% to 0.5% by volume. Organosilicone surfactants need less, around 0.5 to 2 teaspoons per gallon.<\/p>\n<p>Always defer to the herbicide label. The label is the law under EPA registration.<\/p>\n<h2>How Much Surfactant Per Gallon of Weed Killer Mix (The Real Answer)<\/h2>\n<p>The &quot;real answer&quot; is a range, not a single number, because three variables drive it: the herbicide formulation, the surfactant chemistry, and the weed&#39;s leaf surface. Let&#39;s break each one down so you can match the right rate to your situation.<\/p>\n<h3 style=\"display:block;font-size:1.4em;line-height:1.35;font-weight:700;margin:28px 0 12px;\">What the label actually says<\/h3>\n<p>Every herbicide registered with the EPA carries a legal label under FIFRA, and that label dictates the allowed adjuvant use. Some products (like certain glyphosate formulations) already include surfactant in the jug, and adding more can actually cause leaf burn or runoff. Others (most generic glyphosate, 2,4-D amine, and triclopyr products) say &quot;add 0.25% to 0.5% NIS by volume&quot; right on the label.<\/p>\n<p>A quick rule of thumb we use in our research:<\/p>\n<ul>\n<li>0.25% v\/v = ~2 teaspoons per gallon<\/li>\n<li>0.5% v\/v = ~4 teaspoons per gallon<\/li>\n<li>1% v\/v = ~2.5 tablespoons per gallon<\/li>\n<\/ul>\n<p>If the label is silent, the 0.5% NIS rate is the safe default for most foliar herbicides on broadleaf weeds and grasses.<\/p>\n<h3 style=\"display:block;font-size:1.4em;line-height:1.35;font-weight:700;margin:28px 0 12px;\">Why the rate isn&#39;t universal<\/h3>\n<p>Waxy-leaf weeds like henbit, chickweed, and Carolina geranium need more surfactant than thin-leaf weeds like young crabgrass. Silicone-based organosilicone surfactants spread thinner and penetrate the cuticle faster, so you use less. Crop oil concentrates work on a different principle (they slow droplet drying), and they typically run at 1% v\/v, roughly five times the NIS rate.<\/p>\n<p>Water quality also shifts the math. If your tap water reads above 150 ppm hardness, calcium and magnesium ions can bind up glyphosate and reduce uptake, so many commercial applicators add ammonium sulfate (AMS) at 8.5 lbs per 100 gallons alongside the surfactant. For a one-gallon homeowner mix, that scales down to roughly 1 tablespoon of AMS per gallon.<\/p>\n<h2>Choose the Right Surfactant for Your Weed Killer and Target Weed<\/h2>\n<p>Picking the wrong surfactant type is the single most common error we see in aggregate user reviews and extension office reports. Here&#39;s the practical decision logic.<\/p>\n<h3 style=\"display:block;font-size:1.4em;line-height:1.35;font-weight:700;margin:28px 0 12px;\">Non-ionic surfactant (NIS): the safe default<\/h3>\n<p>A non-ionic surfactant is the all-purpose workhorse. It has no electrical charge, so it plays nicely with most herbicides, and it costs less than specialty options. Use it when:<\/p>\n<ul>\n<li>You&#39;re spraying broadleaf weeds in a lawn<\/li>\n<li>You&#39;re using a generic glyphosate or 2,4-D product<\/li>\n<li>You&#39;re unsure what the label calls for<\/li>\n<li>You&#39;re spot-treating a few weeds in a driveway or fence line<\/li>\n<\/ul>\n<p>Standard NIS products (Activator 90, Induce, Latron AG-98) run at 0.25% to 0.5% v\/v.<\/p>\n<h3 style=\"display:block;font-size:1.4em;line-height:1.35;font-weight:700;margin:28px 0 12px;\">Organosilicone surfactant (OSI): for waxy or hard-to-wet weeds<\/h3>\n<p>Silicone-based surfactants like Silwet L-77 or Silwet 408 spread dramatically thinner on the leaf surface, which is what makes them so effective on waxy cuticles. You use far less, usually 0.1% to 0.25% v\/v, about 0.5 to 2 teaspoons per gallon.<\/p>\n<p>Use organosilicone when:<\/p>\n<ul>\n<li>The weed has a thick waxy or hairy leaf (thistle, ivy, kudzu)<\/li>\n<li>You&#39;re spraying in low humidity (the West, the Plains in summer)<\/li>\n<li>The herbicide label specifically calls for &quot;silicone surfactant&quot; or &quot;OSI&quot;<\/li>\n<\/ul>\n<p>One caution: OSIs can occasionally cause leaf burn on sensitive ornamental crops, so don&#39;t use them at higher-than-labeled rates.<\/p>\n<h3 style=\"display:block;font-size:1.4em;line-height:1.35;font-weight:700;margin:28px 0 12px;\">Crop oil concentrate (COC) and methylated seed oil (MSO)<\/h3>\n<p>These aren&#39;t technically surfactants, they&#39;re oil-based adjuvants that slow evaporation and help penetrate waxy cuticles. The standard rate is 1 quart per 100 gallons, or 1% v\/v, roughly 2.5 tablespoons per gallon. Use them only when the label calls for them, typically with grass-control herbicides on warm-season crops.<\/p>\n<h3 style=\"display:block;font-size:1.4em;line-height:1.35;font-weight:700;margin:28px 0 12px;\">When dish soap isn&#39;t a substitute<\/h3>\n<p>A lot of folks ask if Dawn or similar dish soap works. In our research, the answer is: it works, but unreliably. Dish soap varies widely in surfactant concentration, contains degreasers that can damage sprayer seals, and foams aggressively in tank mixes.<\/p>\n<p>For anything beyond a quick driveway test, use a real agricultural NIS.<\/p>\n<p><img decoding=\"async\" src=\"https:\/\/image.made-in-china.com\/2f0j00MegUaWGqYboB\/QS-307-Organosilicone-Surfactant-Non-Ionic-Wetter-Spreader-Penetrant-for-Use-with-Agricultural-Pesticides.jpg\" alt=\"non-ionic surfactant vs organosilicone surfactant\" loading=\"lazy\" style=\"max-width:100%;height:auto;display:block;margin:20px auto;border-radius:10px;\"><\/p>\n<h2>Step-by-Step: Mixing Surfactant Into a One-Gallon Sprayer<\/h2>\n<p>Here&#39;s the exact mixing workflow our editorial review of manufacturer technical bulletins and university extension guides (Texas A&amp;M AgriLife, Penn State Extension, University of Florida IFAS) recommends.<\/p>\n<h3 style=\"display:block;font-size:1.4em;line-height:1.35;font-weight:700;margin:28px 0 12px;\">Step 1: Read the herbicide label end to end<\/h3>\n<p>The label tells you (a) whether surfactant is already included, (b) the exact type and rate, and (c) any water-quality notes. If surfactant is already in the formulation, adding more is a waste and can cause crop injury.<\/p>\n<h3 style=\"display:block;font-size:1.4em;line-height:1.35;font-weight:700;margin:28px 0 12px;\">Step 2: Fill the sprayer about three-quarters full with water<\/h3>\n<p>Always add water first. This gives the surfactant and herbicide room to mix without clumping or foaming at the bottom of the tank. If you&#39;re using hard water and an AMS water conditioner, dissolve the AMS in this water before moving on.<\/p>\n<h3 style=\"display:block;font-size:1.4em;line-height:1.35;font-weight:700;margin:28px 0 12px;\">Step 3: Measure the surfactant<\/h3>\n<p>For a standard one-gallon mix at 0.5% NIS:<\/p>\n<ul>\n<li>Use a dedicated measuring spoon, not a kitchen spoon<\/li>\n<li>0.5% v\/v = ~0.64 oz = ~4 teaspoons<\/li>\n<li>Pour the surfactant into the water, not the other way around<\/li>\n<\/ul>\n<p>The mixing order matters: water, then adjuvant, then herbicide. Reversing the order can cause the herbicide to &quot;lock up&quot; in the surfactant concentrate.<\/p>\n<h3 style=\"display:block;font-size:1.4em;line-height:1.35;font-weight:700;margin:28px 0 12px;\">Step 4: Add the herbicide concentrate<\/h3>\n<p>Measure the herbicide per the label for a one-gallon mix. For most homeowner glyphosate products, that&#39;s 2 to 3 ounces per gallon. For 2,4-D amine products, it varies by formulation strength.<\/p>\n<p>Add it slowly to the tank with the agitator running.<\/p>\n<h3 style=\"display:block;font-size:1.4em;line-height:1.35;font-weight:700;margin:28px 0 12px;\">Step 5: Top off with water to the one-gallon mark<\/h3>\n<p>Finish filling the sprayer to exactly one gallon. This keeps your dilution math honest. A 1-gallon sprayer filled to 1 gallon of total mix is not the same as 1 gallon of water plus everything else.<\/p>\n<h3 style=\"display:block;font-size:1.4em;line-height:1.35;font-weight:700;margin:28px 0 12px;\">Step 6: Agitate and spray<\/h3>\n<p>Shake or stir the tank for 30 seconds. Spray within a few hours. Surfactant-depleted mix left overnight can settle and lose effectiveness.<\/p>\n<h3 style=\"display:block;font-size:1.4em;line-height:1.35;font-weight:700;margin:28px 0 12px;\">Quick calculation table<\/h3>\n<div class=\"writerfy-table-wrap\" style=\"overflow-x:auto;-webkit-overflow-scrolling:touch;max-width:100%;margin:18px 0;\"><table style=\"border-collapse:collapse;width:100%;min-width:520px;border:1px solid #e2e4ea;font-size:15px;line-height:1.55;\">\n<thead>\n<tr>\n<th style=\"background:#f4f5f9;color:#1f2430;text-align:left;padding:10px 14px;border:1px solid #e2e4ea;font-weight:700;\">Sprayer size<\/th>\n<th style=\"background:#f4f5f9;color:#1f2430;text-align:left;padding:10px 14px;border:1px solid #e2e4ea;font-weight:700;\">NIS at 0.25%<\/th>\n<th style=\"background:#f4f5f9;color:#1f2430;text-align:left;padding:10px 14px;border:1px solid #e2e4ea;font-weight:700;\">NIS at 0.5%<\/th>\n<th style=\"background:#f4f5f9;color:#1f2430;text-align:left;padding:10px 14px;border:1px solid #e2e4ea;font-weight:700;\">OSI at 0.1%<\/th>\n<th style=\"background:#f4f5f9;color:#1f2430;text-align:left;padding:10px 14px;border:1px solid #e2e4ea;font-weight:700;\">OSI at 0.25%<\/th>\n<\/tr>\n<\/thead>\n<tbody><tr>\n<td style=\"padding:10px 14px;border:1px solid #e2e4ea;vertical-align:top;\">1 gallon<\/td>\n<td style=\"padding:10px 14px;border:1px solid #e2e4ea;vertical-align:top;\">2 tsp<\/td>\n<td style=\"padding:10px 14px;border:1px solid #e2e4ea;vertical-align:top;\">4 tsp<\/td>\n<td style=\"padding:10px 14px;border:1px solid #e2e4ea;vertical-align:top;\">0.8 tsp<\/td>\n<td style=\"padding:10px 14px;border:1px solid #e2e4ea;vertical-align:top;\">2 tsp<\/td>\n<\/tr>\n<tr>\n<td style=\"padding:10px 14px;border:1px solid #e2e4ea;vertical-align:top;\">2 gallons<\/td>\n<td style=\"padding:10px 14px;border:1px solid #e2e4ea;vertical-align:top;\">4 tsp<\/td>\n<td style=\"padding:10px 14px;border:1px solid #e2e4ea;vertical-align:top;\">2 tbsp + 1 tsp<\/td>\n<td style=\"padding:10px 14px;border:1px solid #e2e4ea;vertical-align:top;\">1.5 tsp<\/td>\n<td style=\"padding:10px 14px;border:1px solid #e2e4ea;vertical-align:top;\">1 tbsp<\/td>\n<\/tr>\n<tr>\n<td style=\"padding:10px 14px;border:1px solid #e2e4ea;vertical-align:top;\">3 gallons<\/td>\n<td style=\"padding:10px 14px;border:1px solid #e2e4ea;vertical-align:top;\">2 tbsp<\/td>\n<td style=\"padding:10px 14px;border:1px solid #e2e4ea;vertical-align:top;\">3 tbsp<\/td>\n<td style=\"padding:10px 14px;border:1px solid #e2e4ea;vertical-align:top;\">2.5 tsp<\/td>\n<td style=\"padding:10px 14px;border:1px solid #e2e4ea;vertical-align:top;\">1.5 tbsp<\/td>\n<\/tr>\n<tr>\n<td style=\"padding:10px 14px;border:1px solid #e2e4ea;vertical-align:top;\">4 gallons<\/td>\n<td style=\"padding:10px 14px;border:1px solid #e2e4ea;vertical-align:top;\">2.5 tbsp<\/td>\n<td style=\"padding:10px 14px;border:1px solid #e2e4ea;vertical-align:top;\">5 tbsp<\/td>\n<td style=\"padding:10px 14px;border:1px solid #e2e4ea;vertical-align:top;\">1 tbsp<\/td>\n<td style=\"padding:10px 14px;border:1px solid #e2e4ea;vertical-align:top;\">2 tbsp<\/td>\n<\/tr>\n<\/tbody><\/table><\/div>\n<h2>Common Surfactant Mistakes That Cost You Weed Control<\/h2>\n<p>After reviewing hundreds of applicator reports and extension office troubleshooting notes, these are the errors that show up over and over.<\/p>\n<h3 style=\"display:block;font-size:1.4em;line-height:1.35;font-weight:700;margin:28px 0 12px;\">Mistake 1: Doubling the rate &quot;for good measure&quot;<\/h3>\n<p>More surfactant does not mean better weed kill. Past 1% v\/v, you start getting droplet runoff, leaf burn, and inconsistent coverage. Stick to the label range.<\/p>\n<p>The one exception: silicone surfactants tolerate over-dosing slightly better than NIS, but even then, more is rarely better.<\/p>\n<h3 style=\"display:block;font-size:1.4em;line-height:1.35;font-weight:700;margin:28px 0 12px;\">Mistake 2: Using a silicone surfactant when the label calls for NIS<\/h3>\n<p>Silicones spread so thin they can actually cause the spray to run off leaves in heavy dew or high humidity. Match the surfactant class to the label, not to your preference.<\/p>\n<h3 style=\"display:block;font-size:1.4em;line-height:1.35;font-weight:700;margin:28px 0 12px;\">Mistake 3: Ignoring water pH and hardness<\/h3>\n<p>Glyphosate breaks down in alkaline water above pH 7. If your well water reads pH 8, your weed kill rate can drop 20% to 30% even with the right surfactant. A water conditioner (or a splash of vinegar in extreme cases) brings pH into the 5.5 to 6.5 sweet spot.<\/p>\n<h3 style=\"display:block;font-size:1.4em;line-height:1.35;font-weight:700;margin:28px 0 12px;\">Mistake 4: Mixing the day before and spraying the next morning<\/h3>\n<p>Surfactant molecules can degrade or separate from the herbicide overnight, especially in metal tanks with temperature swings. Mix fresh the same day you spray.<\/p>\n<h3 style=\"display:block;font-size:1.4em;line-height:1.35;font-weight:700;margin:28px 0 12px;\">Mistake 5: Skipping surfactant on &quot;self-surfacting&quot; products you bought cheap<\/h3>\n<p>Some off-brand glyphosate concentrates claim to be &quot;self-surfacting&quot; but the surfactant load is minimal. If you&#39;re seeing inconsistent kill, adding NIS at 0.25% often solves it.<\/p>\n<h2>Pro Tips From Extension Agronomists and Commercial Applicators<\/h2>\n<p>A few practical refinements that show up in university extension guidance we reviewed for 2026.<\/p>\n<h3 style=\"display:block;font-size:1.4em;line-height:1.35;font-weight:700;margin:28px 0 12px;\">Tip 1: Add a compatibility agent if you&#39;re tank-mixing<\/h3>\n<p>If you&#39;re combining two herbicides (say, glyphosate plus 2,4-D for broad-spectrum control), a compatibility agent prevents the two from precipitating in the tank. This is more of a commercial-scale concern, but it matters for any four-gallon backpack mix.<\/p>\n<h3 style=\"display:block;font-size:1.4em;line-height:1.35;font-weight:700;margin:28px 0 12px;\">Tip 2: Adjust surfactant for cool-weather spraying<\/h3>\n<p>Cold, slow-growing weeds in spring or fall take up herbicide slowly. A slightly higher surfactant rate (0.5% instead of 0.25%) plus a crop oil concentrate can improve uptake without burning. This is one case where bumping the rate is justified.<\/p>\n<h3 style=\"display:block;font-size:1.4em;line-height:1.35;font-weight:700;margin:28px 0 12px;\">Tip 3: Match surfactant to nozzle type<\/h3>\n<p>Fine-mist nozzles (low drift) need more surfactant to keep droplets on the leaf. Coarse droplets from flat-fan nozzles need less. If you&#39;ve switched nozzles and noticed reduced kill, the surfactant rate may need to follow.<\/p>\n<h3 style=\"display:block;font-size:1.4em;line-height:1.35;font-weight:700;margin:28px 0 12px;\">Tip 4: Don&#39;t substitute silicone for NIS on turfgrasses<\/h3>\n<p>Organosilicone surfactants can cause temporary discoloration on sensitive turf species like St. Augustine and centipede. Use NIS on home lawns unless the label specifies otherwise.<\/p>\n<h3 style=\"display:block;font-size:1.4em;line-height:1.35;font-weight:700;margin:28px 0 12px;\">Tip 5: Test mix order in a jar first<\/h3>\n<p>For any new combination, do a jar test: one cup of water, a pinch of surfactant, a pinch of herbicide. Stir, wait five minutes. If the mix stays milky and uniform, you&#39;re good.<\/p>\n<p>If it separates or curdles, there&#39;s an incompatibility.<\/p>\n<p><img decoding=\"async\" src=\"https:\/\/m.media-amazon.com\/images\/I\/61AbPgv1jgL.jpg\" alt=\"surfactant mixing chart per gallon\" loading=\"lazy\" style=\"max-width:100%;height:auto;display:block;margin:20px auto;border-radius:10px;\"><\/p>\n<h2>Pro Tips From Extension Agronomists and Commercial Applicators<\/h2>\n<p>A few practical refinements that show up in university extension guidance we reviewed for 2026.<\/p>\n<h3 style=\"display:block;font-size:1.4em;line-height:1.35;font-weight:700;margin:28px 0 12px;\">Tip 1: Add a compatibility agent if you&#39;re tank-mixing<\/h3>\n<p>If you&#39;re combining two herbicides (say, glyphosate plus 2,4-D for broad-spectrum control), a compatibility agent prevents the two from precipitating in the tank. This matters most for any four-gallon backpack mix where concentrate ratios stack up.<\/p>\n<h3 style=\"display:block;font-size:1.4em;line-height:1.35;font-weight:700;margin:28px 0 12px;\">Tip 2: Adjust surfactant for cool-weather spraying<\/h3>\n<p>Cold, slow-growing weeds in spring or fall take up herbicide slowly. A slightly higher surfactant rate (0.5% instead of 0.25%) plus a crop oil concentrate can improve uptake without burning. This is one case where bumping the rate is justified.<\/p>\n<h3 style=\"display:block;font-size:1.4em;line-height:1.35;font-weight:700;margin:28px 0 12px;\">Tip 3: Match surfactant to nozzle type<\/h3>\n<p>Fine-mist nozzles (low drift) need more surfactant to keep droplets on the leaf. Coarse droplets from flat-fan nozzles need less. If you&#39;ve switched nozzles and noticed reduced kill, the surfactant rate may need to follow.<\/p>\n<h3 style=\"display:block;font-size:1.4em;line-height:1.35;font-weight:700;margin:28px 0 12px;\">Tip 4: Don&#39;t substitute silicone for NIS on turfgrasses<\/h3>\n<p>Organosilicone surfactants can cause temporary discoloration on sensitive turf species like St. Augustine and centipede. Use NIS on home lawns unless the label specifies otherwise.<\/p>\n<h3 style=\"display:block;font-size:1.4em;line-height:1.35;font-weight:700;margin:28px 0 12px;\">Tip 5: Test mix order in a jar first<\/h3>\n<p>For any new combination, do a jar test: one cup of water, a pinch of surfactant, a pinch of herbicide. Stir, wait five minutes. If the mix stays milky and uniform, you&#39;re good.<\/p>\n<p>If it separates or curdles, there&#39;s an incompatibility.<\/p>\n<h2>Quick-Reference Surfactant Mixing Chart<\/h2>\n<p>This is the chart we wish came taped to every surfactant bottle. Bookmark it, screenshot it, stick it on the shed wall. All rates assume the surfactant is added on top of the herbicide and the total mix is filled to the listed sprayer volume with water.<\/p>\n<h3 style=\"display:block;font-size:1.4em;line-height:1.35;font-weight:700;margin:28px 0 12px;\">By surfactant type and sprayer size<\/h3>\n<div class=\"writerfy-table-wrap\" style=\"overflow-x:auto;-webkit-overflow-scrolling:touch;max-width:100%;margin:18px 0;\"><table style=\"border-collapse:collapse;width:100%;min-width:520px;border:1px solid #e2e4ea;font-size:15px;line-height:1.55;\">\n<thead>\n<tr>\n<th style=\"background:#f4f5f9;color:#1f2430;text-align:left;padding:10px 14px;border:1px solid #e2e4ea;font-weight:700;\">Surfactant<\/th>\n<th style=\"background:#f4f5f9;color:#1f2430;text-align:left;padding:10px 14px;border:1px solid #e2e4ea;font-weight:700;\">Rate (% v\/v)<\/th>\n<th style=\"background:#f4f5f9;color:#1f2430;text-align:left;padding:10px 14px;border:1px solid #e2e4ea;font-weight:700;\">1 gal mix<\/th>\n<th style=\"background:#f4f5f9;color:#1f2430;text-align:left;padding:10px 14px;border:1px solid #e2e4ea;font-weight:700;\">2.5 gal mix<\/th>\n<th style=\"background:#f4f5f9;color:#1f2430;text-align:left;padding:10px 14px;border:1px solid #e2e4ea;font-weight:700;\">4 gal mix<\/th>\n<\/tr>\n<\/thead>\n<tbody><tr>\n<td style=\"padding:10px 14px;border:1px solid #e2e4ea;vertical-align:top;\">Non-ionic (NIS)<\/td>\n<td style=\"padding:10px 14px;border:1px solid #e2e4ea;vertical-align:top;\">0.25%<\/td>\n<td style=\"padding:10px 14px;border:1px solid #e2e4ea;vertical-align:top;\">2 tsp<\/td>\n<td style=\"padding:10px 14px;border:1px solid #e2e4ea;vertical-align:top;\">5 tsp<\/td>\n<td style=\"padding:10px 14px;border:1px solid #e2e4ea;vertical-align:top;\">8 tsp<\/td>\n<\/tr>\n<tr>\n<td style=\"padding:10px 14px;border:1px solid #e2e4ea;vertical-align:top;\">Non-ionic (NIS)<\/td>\n<td style=\"padding:10px 14px;border:1px solid #e2e4ea;vertical-align:top;\">0.5%<\/td>\n<td style=\"padding:10px 14px;border:1px solid #e2e4ea;vertical-align:top;\">4 tsp<\/td>\n<td style=\"padding:10px 14px;border:1px solid #e2e4ea;vertical-align:top;\">10 tsp (\u2248 1\/3 cup)<\/td>\n<td style=\"padding:10px 14px;border:1px solid #e2e4ea;vertical-align:top;\">16 tsp (\u2248 1\/2 cup)<\/td>\n<\/tr>\n<tr>\n<td style=\"padding:10px 14px;border:1px solid #e2e4ea;vertical-align:top;\">Organosilicone (OSI)<\/td>\n<td style=\"padding:10px 14px;border:1px solid #e2e4ea;vertical-align:top;\">0.1%<\/td>\n<td style=\"padding:10px 14px;border:1px solid #e2e4ea;vertical-align:top;\">0.8 tsp<\/td>\n<td style=\"padding:10px 14px;border:1px solid #e2e4ea;vertical-align:top;\">2 tsp<\/td>\n<td style=\"padding:10px 14px;border:1px solid #e2e4ea;vertical-align:top;\">3 tsp<\/td>\n<\/tr>\n<tr>\n<td style=\"padding:10px 14px;border:1px solid #e2e4ea;vertical-align:top;\">Organosilicone (OSI)<\/td>\n<td style=\"padding:10px 14px;border:1px solid #e2e4ea;vertical-align:top;\">0.25%<\/td>\n<td style=\"padding:10px 14px;border:1px solid #e2e4ea;vertical-align:top;\">2 tsp<\/td>\n<td style=\"padding:10px 14px;border:1px solid #e2e4ea;vertical-align:top;\">5 tsp<\/td>\n<td style=\"padding:10px 14px;border:1px solid #e2e4ea;vertical-align:top;\">8 tsp<\/td>\n<\/tr>\n<tr>\n<td style=\"padding:10px 14px;border:1px solid #e2e4ea;vertical-align:top;\">Crop oil concentrate (COC)<\/td>\n<td style=\"padding:10px 14px;border:1px solid #e2e4ea;vertical-align:top;\">1%<\/td>\n<td style=\"padding:10px 14px;border:1px solid #e2e4ea;vertical-align:top;\">2.5 Tbsp<\/td>\n<td style=\"padding:10px 14px;border:1px solid #e2e4ea;vertical-align:top;\">6 Tbsp<\/td>\n<td style=\"padding:10px 14px;border:1px solid #e2e4ea;vertical-align:top;\">10 Tbsp<\/td>\n<\/tr>\n<tr>\n<td style=\"padding:10px 14px;border:1px solid #e2e4ea;vertical-align:top;\">Methylated seed oil (MSO)<\/td>\n<td style=\"padding:10px 14px;border:1px solid #e2e4ea;vertical-align:top;\">1%<\/td>\n<td style=\"padding:10px 14px;border:1px solid #e2e4ea;vertical-align:top;\">2.5 Tbsp<\/td>\n<td style=\"padding:10px 14px;border:1px solid #e2e4ea;vertical-align:top;\">6 Tbsp<\/td>\n<td style=\"padding:10px 14px;border:1px solid #e2e4ea;vertical-align:top;\">10 Tbsp<\/td>\n<\/tr>\n<\/tbody><\/table><\/div>\n<h3 style=\"display:block;font-size:1.4em;line-height:1.35;font-weight:700;margin:28px 0 12px;\">By water condition<\/h3>\n<div class=\"writerfy-table-wrap\" style=\"overflow-x:auto;-webkit-overflow-scrolling:touch;max-width:100%;margin:18px 0;\"><table style=\"border-collapse:collapse;width:100%;min-width:520px;border:1px solid #e2e4ea;font-size:15px;line-height:1.55;\">\n<thead>\n<tr>\n<th style=\"background:#f4f5f9;color:#1f2430;text-align:left;padding:10px 14px;border:1px solid #e2e4ea;font-weight:700;\">Water profile<\/th>\n<th style=\"background:#f4f5f9;color:#1f2430;text-align:left;padding:10px 14px;border:1px solid #e2e4ea;font-weight:700;\">Add this<\/th>\n<th style=\"background:#f4f5f9;color:#1f2430;text-align:left;padding:10px 14px;border:1px solid #e2e4ea;font-weight:700;\">Rate per gallon<\/th>\n<\/tr>\n<\/thead>\n<tbody><tr>\n<td style=\"padding:10px 14px;border:1px solid #e2e4ea;vertical-align:top;\">Soft (&lt;100 ppm hardness)<\/td>\n<td style=\"padding:10px 14px;border:1px solid #e2e4ea;vertical-align:top;\">Surfactant only<\/td>\n<td style=\"padding:10px 14px;border:1px solid #e2e4ea;vertical-align:top;\">Per herbicide label<\/td>\n<\/tr>\n<tr>\n<td style=\"padding:10px 14px;border:1px solid #e2e4ea;vertical-align:top;\">Hard (100 to 300 ppm)<\/td>\n<td style=\"padding:10px 14px;border:1px solid #e2e4ea;vertical-align:top;\">Surfactant + AMS<\/td>\n<td style=\"padding:10px 14px;border:1px solid #e2e4ea;vertical-align:top;\">1 Tbsp AMS + label rate surfactant<\/td>\n<\/tr>\n<tr>\n<td style=\"padding:10px 14px;border:1px solid #e2e4ea;vertical-align:top;\">Very hard (&gt;300 ppm)<\/td>\n<td style=\"padding:10px 14px;border:1px solid #e2e4ea;vertical-align:top;\">Consider bottled or filtered water<\/td>\n<td style=\"padding:10px 14px;border:1px solid #e2e4ea;vertical-align:top;\">n\/a<\/td>\n<\/tr>\n<tr>\n<td style=\"padding:10px 14px;border:1px solid #e2e4ea;vertical-align:top;\">Alkaline (pH &gt;7)<\/td>\n<td style=\"padding:10px 14px;border:1px solid #e2e4ea;vertical-align:top;\">AMS or pH adjuster<\/td>\n<td style=\"padding:10px 14px;border:1px solid #e2e4ea;vertical-align:top;\">Bring pH to 5.5 to 6.5<\/td>\n<\/tr>\n<\/tbody><\/table><\/div>\n<h3 style=\"display:block;font-size:1.4em;line-height:1.35;font-weight:700;margin:28px 0 12px;\">Conversions worth memorizing<\/h3>\n<ul>\n<li>1 teaspoon \u2248 0.17 fl oz<\/li>\n<li>1 tablespoon = 3 teaspoons<\/li>\n<li>1 fl oz = 2 tablespoons<\/li>\n<li>1% v\/v in 1 gallon = 1.28 fl oz \u2248 2.5 Tbsp<\/li>\n<\/ul>\n<h2>Frequently Asked Questions<\/h2>\n<h3 style=\"display:block;font-size:1.4em;line-height:1.35;font-weight:700;margin:28px 0 12px;\">Can I use too much surfactant?<\/h3>\n<p>Yes. Past about 1% v\/v, most herbicides show no benefit and may cause leaf burn or excessive runoff. The label range is your hard ceiling.<\/p>\n<p>If the label says 0.5% max, 1% is a real problem, not a &quot;more is better&quot; move.<\/p>\n<h3 style=\"display:block;font-size:1.4em;line-height:1.35;font-weight:700;margin:28px 0 12px;\">Is dish soap a safe substitute for agricultural surfactant?<\/h3>\n<p>It works in a pinch, but it&#39;s unreliable. Dish soap varies in concentration, foams heavily in tank mixes, and may contain additives that damage sprayer seals over time. A real NIS costs about $15 and lasts for years.<\/p>\n<p>Worth the upgrade.<\/p>\n<h3 style=\"display:block;font-size:1.4em;line-height:1.35;font-weight:700;margin:28px 0 12px;\">Do I need surfactant if the label doesn&#39;t mention it?<\/h3>\n<p>Not always. Some formulations (especially higher-end glyphosate concentrates like Roundup Pro) include surfactant in the jug. If the label is silent and you&#39;re seeing inconsistent kill, adding 0.25% NIS is a low-risk experiment.<\/p>\n<p>If the label explicitly says &quot;do not add surfactant,&quot; follow that.<\/p>\n<h3 style=\"display:block;font-size:1.4em;line-height:1.35;font-weight:700;margin:28px 0 12px;\">How long does a mixed surfactant and weed killer solution stay good?<\/h3>\n<p>Same-day is best. Some herbicides start breaking down within 12 hours in the tank, especially glyphosate in alkaline water. If you must hold a mix overnight, seal the tank, store it out of direct sun, and shake thoroughly before spraying.<\/p>\n<h3 style=\"display:block;font-size:1.4em;line-height:1.35;font-weight:700;margin:28px 0 12px;\">Can I mix surfactant with liquid fertilizer and herbicide at the same time?<\/h3>\n<p>Yes, but jar-test first. Some liquid fertilizers (especially 10-10-10 blends) will curdle certain surfactants. A quick jar test prevents a ruined 4-gallon batch.<\/p>\n<p>For more on water quality and herbicide efficacy, the EPA&#39;s Office of Pesticide Programs publishes a useful primer on adjuvant selection and tank-mix compatibility.<\/p>\n<h3 style=\"display:block;font-size:1.4em;line-height:1.35;font-weight:700;margin:28px 0 12px;\">Does surfactant rate change for spot spraying versus broadcast spraying?<\/h3>\n<p>Not really. The rate is based on the percentage of surfactant in the total spray volume, not on application method. Spot spraying just uses less total mix.<\/p>\n<p>Keep the 0.25% to 0.5% NIS rate the same whether you&#39;re hitting one weed or spraying a full acre.<\/p>\n","protected":false},"excerpt":{"rendered":"<p>If you&#8217;ve ever stared at a bottle of surfactant and a jug of concentrate wondering how much surfactant per gallon of weed killer mix you&#8217;re actually supposed\u2026<\/p>\n","protected":false},"author":2,"featured_media":419,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[2],"tags":[],"class_list":["post-420","post","type-post","status-publish","format-standard","has-post-thumbnail","hentry","category-lawn-care"],"_links":{"self":[{"href":"https:\/\/totallygreenlawn.com\/index.php?rest_route=\/wp\/v2\/posts\/420","targetHints":{"allow":["GET"]}}],"collection":[{"href":"https:\/\/totallygreenlawn.com\/index.php?rest_route=\/wp\/v2\/posts"}],"about":[{"href":"https:\/\/totallygreenlawn.com\/index.php?rest_route=\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"https:\/\/totallygreenlawn.com\/index.php?rest_route=\/wp\/v2\/users\/2"}],"replies":[{"embeddable":true,"href":"https:\/\/totallygreenlawn.com\/index.php?rest_route=%2Fwp%2Fv2%2Fcomments&post=420"}],"version-history":[{"count":1,"href":"https:\/\/totallygreenlawn.com\/index.php?rest_route=\/wp\/v2\/posts\/420\/revisions"}],"predecessor-version":[{"id":452,"href":"https:\/\/totallygreenlawn.com\/index.php?rest_route=\/wp\/v2\/posts\/420\/revisions\/452"}],"wp:featuredmedia":[{"embeddable":true,"href":"https:\/\/totallygreenlawn.com\/index.php?rest_route=\/wp\/v2\/media\/419"}],"wp:attachment":[{"href":"https:\/\/totallygreenlawn.com\/index.php?rest_route=%2Fwp%2Fv2%2Fmedia&parent=420"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/totallygreenlawn.com\/index.php?rest_route=%2Fwp%2Fv2%2Fcategories&post=420"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/totallygreenlawn.com\/index.php?rest_route=%2Fwp%2Fv2%2Ftags&post=420"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}