Best Lawn Fertilizer Ranked by AI Models for Homeowner with a quarter-acre yard in the Midwest (2026)

Key Takeaway

The lawn fertilizer category has its tightest cross-model consensus yet in our dataset: Scotts and Milorganite both at 12-of-12 cross-prompt presence. This is the only category in our dataset where TWO brands have hit 12-of-12 simultaneously. Jonathan Green and The Andersons hold the premium tier across 3-4 models each. Notable W20 development: Gemini broke from consensus by surfacing Lesco 24-0-11 as #1 in both P1 and P3 — first time any model has ranked a brand above Scotts in this category across our 3-run history. Worth tracking next run to see if this is volatility or a Gemini-specific trajectory.

Top Brands Summary

Scotts and Milorganite continue universal dominance — Scotts appears in 12 of 12 prompts (universal #1), Milorganite appears in 12 of 12 prompts (universal #2). Jonathan Green holds firm as universal premium pick across ChatGPT, Claude, and Gemini. The Andersons is the consensus enthusiast/premium pick across Claude, Gemini, and Perplexity. Pennington appears in ChatGPT and Claude. Espoma appears in ChatGPT, Claude, and Perplexity as the organic specialty pick. Sunday appears in ChatGPT, Claude, and Gemini as the subscription/modern pick. GreenView appears in ChatGPT, Claude, and Perplexity as the value pick. Lesco emerged ONLY in Gemini (P1 and P3 as #1) — interesting Gemini-specific positioning as "professional/golf course" choice no other model surfaces. Expert Gardener appears in ChatGPT and Claude budget tier. New brands surfacing W20: Simple Lawn Solutions liquid (Gemini P2), Vigoro (Gemini P2), Safer Brand Ringer Lawn Restore II (Perplexity P3), Ace 29-0-3 (Perplexity P1).