Solitaire Herbicide on Nutsedge (Control Guide)

Solitaire may help control actively growing, emerged nutsedge in turf when the current product label allows that turf and site. First confirm the weed, measure the area, and calibrate a clean sprayer. Follow the label for rate, mixing, weather, pets, and re-entry. Do not assume the herbicide is safe for every lawn or use.

Nutsedge can return from underground tubers, so a treated patch may need watching even when the leaves fade. Solitaire is a postemergence herbicide: it is applied to weeds that have emerged and are growing. It is not a substitute for identifying the weed or checking that your grass can tolerate the product.

When pets use the lawn, plan the job around the product label’s directions for keeping people and animals out of the area and allowing them back in. “Pet-friendly” is not a reliable substitute for those instructions. If the label does not clearly cover your turf, site, or intended use, do not spray until you have confirmed the correct directions.

Identify nutsedge and check whether your lawn is eligible

Nutsedge is a sedge, not a grass. Correct identification matters because similar-looking weeds may respond differently, and Solitaire’s directions can vary by site and turf species. Before treatment, confirm the plant, your grass type, and the current label’s approved uses and restrictions.

Yellow nutsedge often has a yellow-green color and a triangular stem. A simple field check is to roll the stem between your fingers; grass stems are usually round or flat, while sedge stems feel triangular. This check can help, but it is not a full identification method. Do not assume a product direction for yellow nutsedge applies to purple nutsedge or other sedges. Treat only species listed on the label.

Check the turf species as well. A broad claim such as “safe for lawns” does not show that a product is safe for every grass. Applying to an unlisted or sensitive turf, using too much, or spraying stressed grass may cause severe discoloration or injury. If you cannot name your turf with confidence, get it identified before treatment.

Solitaire is commonly listed as a four-way combination containing sulfentrazone 4.3%, quinclorac 18.3%, 2,4-D 12.2%, and dicamba 1.7%. Verify the product and percentages on your container, since formulations and labels can change. Always use the current label for the exact product you have.

Check the label before mixing

The label is the source for the allowed site, turf species, target weeds, rate, water volume, adjuvant instructions, and application limits. It also gives directions for protective equipment, re-entry, irrigation, mowing, grazing or harvest, and disposal. These details can change, so do not rely on an old online rate or another herbicide’s directions.

Solitaire turf directions commonly give a range of 1–2 fluid ounces per 1,000 square feet. That range is not a recommendation for every nutsedge treatment. Use the rate and any repeat-treatment interval specified for your site, turf, and target weed on the current label. Do not exceed the maximum rate or number of applications.

Equipment setup and safety preparation

A calibrated sprayer applies a known amount of product over a measured area. This reduces uneven coverage and helps prevent accidental over-application. Use a clean turf sprayer with agitation if directed, and choose a nozzle that gives uniform coverage according to the product instructions.

Start by measuring the patch you plan to treat. For a rectangular area, multiply its length by its width. For an irregular patch, divide it into smaller shapes, estimate each area, and add them together. Keep the treated area within the label’s site and size directions.

Calibrate before adding herbicide

Calibration means checking how much spray your equipment puts out over a known area. Do it with clean water before mixing product. Follow the sprayer maker’s instructions and the herbicide label for spray volume and setup; do not assume that matching the product rate alone will give the right coverage.

A practical sequence is:

• Wear the protective equipment required by the label.
• Check the tank, hose, filter, and nozzle for leaks, blockage, or residue.
• Fill the sprayer with water and test it over a measured area.
• Adjust your walking pace or sprayer settings until output is even.
• Calculate the amount of product needed for the measured treatment area.
• Add and mix the product as directed, including agitation if required.

As a rate calculation example, at 1 fluid ounce per 1,000 square feet, 10,000 square feet requires 10 fluid ounces of product. At a different labeled rate, the amount changes in the same proportion. This calculation does not tell you how much water to use; follow the label’s water-volume directions and your sprayer calibration.

Plan for people, pets, weather, and nearby plants

Read the label before opening the container. Keep people and pets out of the application area as directed. Do not set your own re-entry time: use the label’s directions. Protect untreated plants from spray drift, and avoid runoff. Wind, rain, heat, and other weather limits must also be taken from the current label.

Do not spray turf that is drought-stressed, heat-stressed, or otherwise under stress unless the label permits it. If the weather or lawn condition is outside the label’s directions, wait. A missed treatment window is preferable to risking injury to the turf or exposing a nearby plant to drift.

Field application and nutsedge control

Postemergence treatment works on emerged weeds, so timing matters. Apply to actively growing nutsedge when the label permits the conditions and the turf species. Aim for even coverage, not a heavier dose on each plant. Then follow label directions for irrigation, mowing, re-entry, and any later treatment.

Walk the site before spraying. Mark the nutsedge patches and note nearby beds, trees, water features, and other plants that could be affected by drift or runoff. Check that the area is eligible for treatment, then apply uniformly at the labeled rate. Avoid overlapping passes in a way that puts more than the allowed amount on one spot.

What to expect after treatment

Do not judge success by the first few hours. Follow the label’s directions, then inspect the treated area after the time it specifies or when the weed’s response is clear. Record what you see: which patches changed, which remain green, and whether new shoots appear. Nutsedge can return, so fading leaves do not prove that every underground tuber is dead.

If control is incomplete, check the basics before considering another application. Confirm the weed identification, product rate, coverage, timing, turf condition, and whether the label permits retreatment. Do not repeat early or exceed the labeled maximum. If the label does not give a clear path for the remaining weeds, seek advice from a local extension service or licensed turf professional.

Field examples: how to make the decision

These examples show how I would organize a treatment decision; they are not product trial results or promises of control. The label and site conditions determine whether Solitaire is appropriate. A careful decision can prevent wasted product and avoidable lawn damage.

A homeowner finds a small patch in a lawn but does not know whether the grass is a listed species. The sound next step is not to guess a low rate. Identify the turf, check the label for that species and site, and treat only if the use is allowed.

A second property has several large patches and a measured treatment area. The manager checks the label, calibrates the sprayer with water, calculates product from the labeled rate, and applies evenly. They record the date and conditions, then wait for the label’s retreatment interval before deciding what to do next.

In a third case, the nutsedge is growing beside ornamental plants and the day is windy. Even if the turf and weed are eligible, drift could harm plants the treatment is not meant for. The manager postpones spraying until conditions meet the label and a careful application is possible.

Sprayer cleaning and application records

Cleaning limits the chance that herbicide residue will harm plants during a later use. Follow the product label for rinsing, rinsate, and container disposal. Do not pour leftover spray or rinsate into a drain, ditch, or water body unless the label and local rules specifically allow that disposal method.

After application, clean the sprayer as directed by the label and equipment maker. Pay attention to the tank, hose, filter, and nozzle. Keep rinse water within the label’s disposal directions. Dispose of empty containers as instructed; do not reuse them.

Keep a short record with the product name, label date or version if available, treated turf species, area, rate, water volume, date, weather, and observations. Record any repeat application only after confirming it is allowed. These notes help explain results and prevent accidental over-application.

Storage and seasonal chemical care

Store the product in its original container and follow the label’s storage instructions. Keep it secured away from children, pets, food, and feed. Do not transfer herbicide into an unmarked bottle. Check the container and label before future use, and follow local rules for unwanted product and empty containers.

Avoid buying more than you can use according to the label and product storage directions. If the label is damaged or unreadable, do not guess at the rate or safety instructions. Contact the manufacturer or local pesticide authority for help with the exact product.

Frequently asked questions

Can Solitaire control nutsedge in a lawn?
It may control listed nutsedge in turf when the current label permits the weed, site, and grass species. Confirm all three before use.

What rate should I use for nutsedge?
Use the rate on the current label for your site, turf, and target weed. Turf directions commonly list 1–2 fluid ounces per 1,000 square feet, but that range is not a universal nutsedge rate.

How much product covers 10,000 square feet?
At a labeled rate of 1 fluid ounce per 1,000 square feet, the calculation is 10 fluid ounces. Recalculate for the actual labeled rate and measure spray water separately.

Does Solitaire control purple nutsedge?
Do not assume so. Check whether the current label specifically lists purple nutsedge and follow its directions.

Is Solitaire safe for every type of grass?
No. Check the label for your exact turf species. Use on unlisted or sensitive turf can cause serious injury.

Can I spray when the lawn is dry or heat-stressed?
Do not treat stressed turf unless the label permits it. Follow the product’s weather and turf-condition directions.

When can my pets return to the lawn?
Use the label’s re-entry directions. Do not rely on a general “pet-safe” claim or create your own waiting period.

Can I mow or water after application?
Follow the label for mowing and irrigation timing. Do not use another herbicide’s directions.

Should I apply again if nutsedge remains?
First check the label’s retreatment interval and maximum application limits. Do not repeat sooner or apply more than allowed.

What if I am unsure whether the plant is nutsedge?
Pause treatment and confirm the weed’s identity. Herbicide directions for one weed may not apply to another.

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