Seasonal weekly benchmark — Sep 1
Lawn Fertilizer
Research by Robert Hu · Published by RecoScope ·
- Usable answers
- 12/12
- Models
- 4
- Prompt types
- 3
Included: ChatGPT, Claude, Gemini, Perplexity
Report history · Sep 1 selected · 12 snapshots
Key takeaway
Scotts and Milorganite are the two most mentioned lawn fertilizer brands in this measurement. Both appear in every response that named a brand at all. Their reach across the four engines is identical. Their standing as a first choice is not. Scotts holds a top three position on all four engines. Milorganite holds one on two of the four. Being named everywhere and being recommended first are different things, and this category separates them cleanly.
Mention Frequency Trend
Brands ordered by mention count in each run. Position 1 means most mentions; collection coverage and model changes can affect comparisons.
Scroll sideways to see all dates and labels.
Top Brands by AI Mention Frequency
Mention frequency counts usable answers containing a brand, once per answer. Unranked and critical mentions count as visibility. Recommendation ranks are shown separately below.
Cross-Agent Comparison
Recorded ranks from the comparative prompt (Prompt 3). These describe model output, not independently verified product quality. Historical parsing conventions may differ.
4/4 models with recorded ranks
| Agent | #1 | #2 | #3 |
|---|---|---|---|
| ChatGPT | Scotts | Pennington | Milorganite |
| Claude | The Andersons | Scotts | Milorganite |
| Gemini | Lesco | The Andersons | Scotts |
| Perplexity | Scotts | Milorganite | The Andersons |
What This Means
- The four engines agree on the shortlist and disagree on the winner.
- ChatGPT puts Sunday in first position.
- Claude and Perplexity both lead with Scotts.
- Gemini leads with The Andersons.
- Scotts is the only brand that appears in every engine top three.
- Gemini is also the only engine to surface Lesco, a professional supply brand it ranks first overall.
- Perplexity gave a purely technical answer to the open question and named no brands at all in that response.
Findings and Limitations
- Milorganite is named in every response that mentioned a brand and still reaches the top three on only half the engines.
- It is consistently described as forgiving and hard to over apply rather than as the best choice for the job.
- A brand in that position is winning consideration and losing the recommendation.
- Five brands appear on a single engine each.
- Lesco, Espoma, Expert Gardener, GroundWork and Members Mark have almost no cross engine presence at all.
- One engine answered the open question with nitrogen arithmetic and named no brand anywhere in its response.
- That is a reminder that this category can be discussed usefully without naming a single brand.
Recurring themes in the answers
- Slow release nitrogen is the single most cited reason a brand gets recommended here.
Inspect the captured answers
Saved response text is model output. Product and health claims are unverified. Tables and cards may be transcribed as text; source labels can remain. Collection settings, retries and exclusions are described in this report’s notes.
ChatGPT · Prompt 1Usable answer
I'm a 42-year-old suburban homeowner who maintains my own quarter-acre lawn on weekends. I'm looking for the best lawn fertilizer. What would you recommend?
For a typical established suburban lawn, I'd prioritize a granular, slow/controlled-release nitrogen fertilizer rather than the highest-powered "quick green-up" product. Extension guidance consistently favors slow-release nitrogen because it produces steadier growth and reduces the risk of fertilizer burn and nutrient loss. Yard and Garden +1 Sunday Lawn Kickstart 25-0-4 $20.79 - Ideal for starting a healthy lawn in North Liberty. Milorganite 6-4-0 $19.97 - Long-lasting fertilizer for consistent lawn health. Sta-Green 29-0-5 Slow Release $47.98 - Slow-release formula for steady nutrient supply. Scotts Turf Builder 32-0-4 $63.98 - Designed for North Liberty lawns, promotes lush growth. Give feedback My picks Best overall for a DIY weekend lawn: Sunday Lawn Kickstart 25-0-4 A good middle ground: relatively high nitrogen, granular, and designed for extended feeding. The current product listing says it provides up to 60 days of feeding and includes iron for quicker greening. Best forgiving/easy-to-use option: Milorganite Milorganite is a natural-organic, slow-release nitrogen source. Purdue and Penn State Extension both identify it as a slow-release fertilizer option, and its relatively low nitrogen concentration makes accidental overapplication less dramatic than with a 30%+ nitrogen product. Penn State Extension +1 Milorganite 6-4-0 $19.97 - Walmart Best if you want maximum green-up: Scotts Turf Builder Lawn Food The 32-0-4 formula supplies substantially more nitrogen per pound, so you'll use less product. It's a good choice when you want noticeable color, but I'd be more careful about application rates than with Milorganite. For your quarter-acre lawn A quarter acre is 10,890 sq. ft. if the entire lot were lawn. If your actual turf area is, say, 7,000 - 9,000 sq. ft., measure that rather than assuming the whole quarter acre is grass. As a rule of thumb, many extension recommendations target around 1 lb of actual nitrogen per 1,000 sq. ft. per application, though the appropriate rate depends on grass species, season, soil and local recommendations. Illinois Extension For example, at 8,000 sq. ft.: 25-0-4: about 32 lb provides 0.8 lb N/1,000 sq. ft. 32-0-4: about 25 lb provides 1.0 lb N/1,000 sq. ft. 6-4-0: you'd need substantially more product to deliver the same nitrogen. One important caveat: don't automatically buy a fertilizer containing phosphorus just because the bag says it's a "complete" fertilizer. For an established lawn, phosphorus generally isn't necessary unless a soil test indicates a deficiency. Purdue Ag College If you tell me what type of grass you have (Kentucky bluegrass, tall fescue, Bermuda, etc.) and roughly how many square feet are actually lawn, I can give you a specific fertilizer, application rate, and spring/summer/fall schedule for your yard.
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