Scotts Starter With Mesotrione (Product Guide)
Scotts’ mesotrione starter fertilizer combines lawn nutrients with a weed-control active ingredient for certain new-seeding jobs. Check the exact bag’s label before buying or applying: permitted grass types, sites, rates, timing, and pet precautions can vary. Measure first, spread evenly at the labeled rate, and keep people and pets away as directed.
A new lawn needs more than seed. You also need a product that suits the grass you are planting and a plan for applying it evenly. This granular starter fertilizer may fit some seeding projects, but it is not a universal weed preventer or a substitute for checking the label.
If pets use the yard, plan their access before you open the bag. Do not assume that a product is pet-safe because it is sold for lawns. Follow the package directions for keeping children, pets, and bystanders away, and for when the area may be used again.
What is Scotts starter fertilizer with mesotrione?
This is a granular lawn product intended for certain new-lawn seeding situations. It combines starter fertilizer with mesotrione, a weed-control active ingredient. The product name and directions may change, so check the exact bag’s label, not a similar-looking package or an online spreader chart.
A common product name is Scotts Turf Builder Starter Food for New Grass Plus Weed Preventer. Common specifications include a 21-22-4 N-P-K analysis and 0.08% mesotrione. N-P-K lists the fertilizer’s percentages of nitrogen, phosphate, and potash. Check the guaranteed analysis and active-ingredient statement on your bag before using those figures.
A commonly listed application rate for that formulation is 4.3 pounds per 1,000 square feet. Treat that as a reference, not a substitute for the label. If your package gives a different rate, follow the package.
Mesotrione can suppress certain labeled weeds while new grass becomes established. It does not control every weed, and results depend on the weed, grass, site, and application directions. Check the label’s weed list and permitted uses before deciding whether this product fits your project.
Is it right for your grass and seeding job?
Compatibility means the label allows the product to be used with the grass species, site, and seeding timing you have. Those details matter: an application outside the label can harm or discolor turf and may interfere with establishment.
Before buying or applying, find the label sections for use sites, grass types, seeding directions, and restrictions. Grass species can respond differently to herbicides. Do not assume a product is suitable for every cool-season or warm-season lawn, or for overseeding an established lawn.
Check these points:
- Is your grass species listed as permitted?
- Does the label allow use at seeding or on your specific type of lawn?
- Does it give a timing window, such as application at seeding or within two days after seeding?
- Are there restrictions for your site, weather, or nearby plants?
- What watering directions and people-and-pet precautions apply?
If the label does not clearly permit your grass and use, do not apply it. Ask the manufacturer or a local extension service for guidance rather than guessing. This is especially important when seeding a mixed lawn, since one species may be more sensitive than another.
Equipment setup and safety preparation
A calibrated spreader delivers a measured amount of granules over a known area. Use a rotary or drop spreader that is in good repair, and follow the setting listed for your exact product and spreader model. A setting from another Scotts starter fertilizer may not match.
First, measure the lawn area you plan to treat. For a rectangle, multiply length by width in feet. For an irregular area, divide it into smaller shapes, measure each one, and add the areas. Leave out beds, paths, and other areas the label does not allow you to treat.
Then calculate the amount needed using the package rate. At the common rate of 4.3 pounds per 1,000 square feet:
| Measured area | Product at 4.3 lb per 1,000 sq ft |
|---|---|
| 500 sq ft | 2.15 lb |
| 1,000 sq ft | 4.3 lb |
| 2,500 sq ft | 10.75 lb |
| 5,000 sq ft | 21.5 lb |
These are arithmetic examples for that rate only. Use the rate on your bag if it differs. Weigh or measure the amount before loading the spreader; do not estimate by filling the hopper to a particular level.
Wear any protective equipment required by the label. Keep children, pets, and bystanders away during application. Check the spreader for damage, and calibrate it over a non-lawn surface or as the label directs. Avoid testing by spreading product across an untreated part of the lawn.
Field application and new-lawn establishment
Apply evenly at the labeled rate and timing. For the common formulation, directions often allow application at seeding or within two days after seeding. Confirm that timing on your own package, then follow its instructions for watering or leaving the granules undisturbed.
A steady pace and planned passes help prevent stripes, skips, and excess product. Set a route before starting. Keep granules off pavement, garden beds, and water. If granules land where they should not, collect them and return them to the treatment area only as the label allows.
Use this sequence:
- Finish measuring the treatment area and product amount.
- Prepare the seedbed and seed according to the seed and product directions.
- Set the spreader using the exact bag’s instructions.
- Walk at a steady pace, with consistent, overlapping passes if directed.
- Stop if the spreader clogs, the weather changes in a way that conflicts with the label, or you lose track of the treated area.
- Water or leave the product undisturbed as directed.
Do not increase the rate to improve weed control. Do not make an extra application unless the label specifically permits it. Poor results may come from weeds outside the label’s control, a mismatch between product and grass, or unsuitable growing conditions; extra product is not a safe fix.
Worked examples: amount and application plan
These examples show how to plan a job; they are not reports of actual installations. The product amount uses the common 4.3-pound rate. Confirm the rate and permitted use on your package before applying.
| Seeding situation | Practical check | Amount at common rate |
|---|---|---|
| 1,000-sq-ft new lawn | Confirm the grass and seeding use are permitted; plan a full, even pass pattern. | 4.3 lb |
| 2,500-sq-ft renovation | Measure only the area being seeded; confirm the label allows the renovation use. | 10.75 lb |
| 5,000-sq-ft project | Divide the site into manageable sections and track each completed pass. | 21.5 lb |
For example, a 2,500-square-foot project calls for 10.75 pounds at the common rate. If you split the area into five equal 500-square-foot sections, each section corresponds to about 2.15 pounds. Sectioning can make it easier to spot a missed strip or avoid applying the full amount to only part of the lawn.
Spreader cleanup and application checks
A final check helps catch missed areas, spills, and product left on hard surfaces. Look over the lawn and nearby pavement before putting equipment away. Sweep granules from hard surfaces back onto the lawn only when the label allows, and keep them away from drains and water.
After applying, follow the package’s watering and re-entry directions. Wash your hands and clean the spreader safely, using the label’s instructions. Keep pets off the area until the label says they may return; do not rely on a general drying-time rule from another lawn product.
If you spill product or apply too much, stop. Do not spread the excess across a larger area unless the label directs that action. Read the label’s first-aid and environmental directions, then contact the manufacturer or local extension service for site-specific advice. Overapplication or use on a non-permitted grass can injure or discolor turf.
Product storage and seasonal care
Store leftover product in its original, closed container, in a dry place, as directed by the label. Keep it out of reach of children and pets. Do not transfer it to a food or drink container, and follow package directions for disposal rather than putting unused product down a drain.
Before using a stored bag, check that its label is legible and that the product has not been contaminated or damaged. If the label is missing, do not rely on memory or a rate from another product. Get the current directions from the manufacturer or choose a product with a complete label.
Frequently asked questions
These answers summarize the main decisions, but the exact product label controls. Check it for the allowed grass, site, rate, timing, watering, and precautions before each application.
Can I use this product on any grass seed?
No. Use it only when the exact label permits your grass species and seeding situation. If your grass is not listed or you are unsure, do not apply it until you confirm compatibility.
What is the common application rate?
A common rate for the 21-22-4 formulation is 4.3 pounds per 1,000 square feet. Verify your bag, since formulations and directions can vary.
How much do I need for 5,000 square feet?
At 4.3 pounds per 1,000 square feet, the calculation is 21.5 pounds. Use the package rate if it differs.
When should I apply it?
Some directions allow application at seeding or within two days after seeding. Follow the timing on your exact label.
Can I use it on established grass?
Do not assume so. Apply it to established turf only if the exact label expressly allows that use.
Is it safe for pets?
Do not treat it as automatically pet-safe. Keep pets away during application and follow the label’s instructions for when they may return.
Can I use a spreader setting from another Scotts product?
No. Match the setting to the exact product and spreader model listed on the label. A setting for another starter fertilizer may deliver too much or too little.
Should I apply more if weeds remain?
No. Never exceed the labeled rate or make an unlisted repeat application. Check whether the weeds are listed for control and ask the manufacturer or an extension service if needed.
What should I do if I apply too much?
Stop and consult the label’s first-aid and environmental directions. Contact the manufacturer or local extension service for advice specific to the grass and site.
Do I need to water after spreading?
Follow the package’s watering directions. Do not substitute instructions from another fertilizer or herbicide.
What if granules land on a driveway?
Sweep them up promptly. Return them to the treatment area only as the label allows, and keep them out of drains and water.
Bottom line
This product can suit a new-lawn project when its label allows your grass, site, and seeding timing. Measure the area, calculate the amount, use the correct spreader setting, and follow every safety and watering direction. If any key detail does not match, pause and confirm before applying.
(This article was written by one of our staff writers, Victor Dempsey. Visit our Meet the Team page.)
