Cimarron Plus Weed Killer (Mixing Ratios & Rates)

Cimarron® Plus is a dry-flowable herbicide, so the correct amount depends on the labeled rate per acre and how much ground your sprayer covers. Check the current local label for the site, weed, rate, adjuvant, and restrictions. Calibrate first, weigh the product, then mix and apply only as the label directs.

How do you avoid putting too much or too little Cimarron Plus in a spray tank? Start with the area you intend to treat, not a generic “ounces per gallon” recipe. The same tank concentration can treat very different acreage when sprayer output changes.

I use a simple rule for planning: confirm the label, measure the site, calibrate the sprayer, and only then calculate the product amount. The worked figures below explain the math; they are not a substitute for the current product label or a recommendation for a particular weed or site.

Equipment Setup & Safety Prep

Before mixing, confirm that the current label permits Cimarron Plus on your site and for your target weed. Check the directions for turf or grass species, soil and crop-rotation limits, application method, rate, and protective equipment. The label sets the legal use; a rate that fits one pasture use may not fit another site.

Confirm the product and use

Cimarron Plus is a dry-flowable herbicide containing 48.2% metsulfuron-methyl and 15.9% chlorsulfuron, according to the product information specified for this guide. Confirm the container label and registration for your location. Do not use directions for Cimarron, another formulation, or a different product as a substitute.

Find the label section that matches both the site and weed. Then verify:

• The site and grass species are listed.
• The target weed is listed and the label gives a rate for it.
• The rate is permitted for the application method you plan to use.
• Soil, reseeding, and crop-rotation restrictions fit your plans.
• Any adjuvant, tank-mix, grazing, haying, repeat-application, and annual-maximum directions are clear.

If any part does not match, stop and check the current label or contact the manufacturer or your local extension service. Do not infer that a use is allowed because the product worked elsewhere.

Set the rate by treated area

For certain labeled pasture or rangeland uses, rates may fall within 0.125 to 1.25 ounces of product per acre. That is a label-dependent range, not a general recommendation. Use the exact rate for the listed weed and site, and never exceed the label’s per-application or annual maximum.

Calculate the amount for a tank using this formula:

Product per tank (oz) = labeled rate (oz/acre) × tank volume (gal) ÷ calibrated spray volume (gal/acre)

For example, if the applicable label rate is 0.5 oz per acre and your calibrated sprayer applies 20 gallons per acre:

This example explains the calculation only. It does not establish that 0.5 oz per acre is right for your site or weed. Because the product is dry-flowable, measure it by weight on a suitable scale. Do not guess with a spoon or use a volume measure as if it were a weight.

Prepare the sprayer and protect nearby areas

Inspect the tank, hoses, seals, screen, and nozzle for leaks or blockage. Wear the personal protective equipment listed on the label, and keep people and animals away as directed. Plan to protect desirable broadleaf plants, neighboring crops, water, and other sensitive sites from drift or runoff.

Check label setbacks and weather restrictions before spraying. If wind, rain risk, or site conditions make it hard to keep spray on the target area, delay application. The next step is to confirm sprayer output and calculate how much acreage each tank will cover.

Field Application & Mixing Sequence

A correct tank recipe starts with a calibrated sprayer. Calibration tells you how many gallons are applied to an acre, which lets you convert the label’s acreage rate into a measured amount for each tank. Mix only after the site, weed, rate, and spray volume are known.

Calibrate before calculating

Use clean water to determine actual output at your usual walking speed and treated width. For a boom sprayer, account for the width covered. For a hand sprayer, measure a known area and record the water used to cover it evenly. Follow the equipment maker’s directions where applicable.

Calculate gallons per acre:

Gallons per acre = gallons sprayed ÷ acres covered

For instance, if a test shows that 2 gallons cover 0.1 acre, the output is 20 gallons per acre. Repeat the test if speed, pressure, nozzle, or walking pattern changes. Record the area each full tank will treat. Do not rely on an old calibration if equipment or technique has changed.

Measure and mix in label order

Once calibration is complete, use the formula above to find the product amount for the tank. Check the arithmetic and unit conversions before weighing. Small quantities call for a scale that can measure them reliably; if your scale cannot, do not round up or estimate. Get suitable measuring equipment or ask a qualified local adviser how to proceed under the label.

Follow the label’s mixing sequence. In general, the label may direct you to partly fill the tank with clean water, start agitation, add the measured dry-flowable product, let it disperse, and then top up while continuing agitation. Use the actual container label for the required order and any additional instructions.

Do not mix concentrates together unless the label allows it. Add a nonionic surfactant only when the directions for that specific use require or permit it, and use the labeled rate. There is no universal surfactant amount that applies to every use or tank.

Apply evenly to the labeled target

Treat only the listed site and target weed. Keep the spray pattern even; avoid skips, overlap, and drift onto desirable plants. Follow the label’s limits for repeat applications and annual totals, as well as grazing, haying, reseeding, and rotational crops.

A practical field record can prevent a second application from exceeding a limit. Note the date, site, target, labeled rate, treated acreage, spray volume, product amount, and any required adjuvant. The key check before spraying is that the product amount matches the measured acreage in that tank.

Maintenance, Calibration & Application Safety

Cimarron Plus contains two ALS/AHAS-inhibiting herbicides. Residues or spray drift can injure sensitive broadleaf plants, and the risk depends on use rate, site conditions, and label restrictions. Safe planning means following the exact label directions for off-target protection, crop rotation, reseeding, cleanup, and disposal.

Watch for carryover and drift

Carryover means herbicide remains in the soil or plant material long enough to affect a later planting. Do not assume a site is safe for a broadleaf crop, ornamentals, or reseeding just because the spray has dried or symptoms are not visible. Follow the precise rotation and reseeding restrictions for your use and location; do not substitute a generic “safe after X days” interval.

Drift can move spray beyond the intended area. Protect neighboring crops and sensitive plants by following label setbacks, weather limits, and application directions. If the label does not clearly cover your site, planned tank mix, or rotation, stop and seek clarification before treating.

Clean equipment and manage rinsate

Use the label’s tank-cleanout and decontamination procedure before the sprayer is used on sensitive crops or other plants. Pay attention to any directions for screens, nozzles, hoses, and other parts that may hold residue. A quick water rinse is not a substitute if the label specifies more.

Manage rinsate, leftover spray, and empty containers as directed by the label and local rules. Do not discharge them into drains, waterways, or untreated areas. If you are unsure how to handle leftover material, check the label and local waste requirements rather than improvising.

Recheck when conditions change

Pause and review the directions if the target, site, spray volume, weather, adjuvant, or planned crop rotation changes. A calculation is only valid for the rate and calibration used to make it. The safest decision is not to spray until every part of the plan is covered by the current label.

Storage & Seasonal Care

Store Cimarron Plus in its original labeled container, closed and secured as the label directs. Keep moisture and unauthorized access out, and follow label and local requirements for leftover product, packaging, and rinsate. Do not keep an unmarked premix or assume stored spray remains suitable for later use.

Store product and leftovers correctly

Keep the product in the original container with its label intact. Follow the label’s storage conditions and access precautions. Protect the product from moisture contamination, and do not transfer it to a food or drink container.

Do not save an unmarked tank mixture for another day. Follow the label’s directions for unused spray and disposal. Before the next season, check that the product label is readable and still matches the registered product and directions for your jurisdiction.

A simple field-planning example

Suppose you have a labeled site and target, and the applicable label rate is 0.5 oz per acre. Your calibrated sprayer applies 20 gal per acre, and you plan to spray 0.2 acre. The amount is 0.5 × 0.2 = 0.1 oz by weight. A 4-gallon tank would cover that 0.2 acre at the calibrated output.

That arithmetic does not confirm that the example rate, site, weed, or application timing is appropriate. Those decisions come from the current label. The useful lesson is the order: confirm the use, calibrate, measure the area, calculate, weigh, then mix.

Frequently asked questions

How much Cimarron Plus goes in a gallon of water?

There is no universal amount per gallon. Divide the labeled ounces per acre by the sprayer’s calibrated gallons per acre to get ounces per gallon. Use that result only for the site, target weed, and rate allowed by the current label.

What is the typical rate per acre?

Rates depend on the labeled site and target weed. Some labeled pasture or rangeland uses may fall within 0.125 to 1.25 oz per acre, but that range is not a recommendation for every use. Use the exact rate in the applicable label table.

Can I measure the product with a spoon?

Do not rely on a spoon or an unverified volume measure. This dry-flowable product should be measured by weight with a suitable scale. If the required amount is too small for your scale to measure reliably, do not guess or round up.

How do I calculate the amount for a small tank?

Multiply the labeled rate in ounces per acre by the tank volume in gallons, then divide by your calibrated gallons per acre. This gives ounces of product for that tank. First confirm how many acres the tank will treat.

Do I need a surfactant?

Only use a surfactant when the directions for your specific labeled use call for or allow it. Follow the stated type and rate. Do not assume the same adjuvant direction applies to every site or tank mix.

Can I use the same rate for every weed?

No. The rate depends on the target weed and labeled site, among other use directions. Match the weed and site to the current label table, and do not exceed the label’s per-application or annual limit.

Is it safe to reseed after spraying?

The answer depends on the label’s reseeding and rotation restrictions for the specific use, rate, and conditions. Do not use a generic waiting period or assume that dry spray means the site is safe to plant.

How should I clean the sprayer?

Follow the product label’s tank-cleanout and decontamination directions before using the equipment on sensitive plants or crops. Manage rinse water as directed. Do not discharge rinsate into a drain, waterway, or untreated area.

Can I apply before rain or in windy conditions?

Follow the label’s weather restrictions and directions to prevent runoff and drift. If conditions make it difficult to keep the spray on the target area, delay treatment rather than risk off-target injury.

What should I do if the label does not clearly cover my use?

Do not spray until you have confirmed the permitted site, target, rate, and restrictions. Check the current product label or contact the manufacturer or a qualified local adviser.

(This article was written by one of our staff writers, Victor Dempsey. Visit our Meet the Team page.)