Simple Lawn Solutions - High Potassium Lawn Food Liquid Fert

The Verdict

Potassium is the forgotten macronutrient. Most lawn owners chase nitrogen for green-up, but if your grass is yellowing with brown edges, wilting despite watering, or going dormant early, the problem might not be N — it’s K. Simple Lawn Solutions bottles that exact fix in a 0-0-25 liquid concentrate, and at 4.5 stars across 225 ratings, it’s clearly earning its keep.

What you actually get
A 1-gallon jug (also available in 2.5-gallon) of dark, slightly viscous liquid. The label reads 0-0-25 — zero nitrogen, zero phosphorus, 25% soluble potash. That’s it. No micronutrient cocktail, no proprietary blends. This is a single-purpose tool, and it does that one job well. The product image shows a straightforward, no-frills bottle with clear mixing instructions: 4 ounces per gallon of water for spot treatments, 3–4 gallons per 1,000 square feet for full coverage.

Real-world performance
I tested this on a fescue lawn that was showing classic potassium deficiency — yellowing leaf tips, weak root growth, and poor recovery after a hot July stretch. Mixed at the label rate and applied with a pump sprayer, the difference showed in about nine days. The yellowing stopped advancing, and new growth came in darker and stiffer. That tracks with how potassium works: it regulates water uptake and enzyme activity, so stressed grass recovers faster.

The zero-nitrogen angle is the smartest part. Most “winterizer” or “stress relief” products pile on N, which forces top growth that roots can’t support. This formula builds root density and cell wall strength instead. One reviewer noted, “Used this before the first frost and my lawn came through winter noticeably greener than neighbors who used standard fall fertilizer.” Another said, “My bermuda grass stopped dying back in the high-traffic areas after two applications, three weeks apart.”

Where it falls short
Two honest gripes. First, the cap is not a measuring cap — you’ll need your own measuring cup. For a product that’s all about precise dosing, that’s an annoying oversight. Second, the liquid is thicker than typical 0-0-25 synthetics, and if you don’t pre-mix thoroughly, it can clog the fine mesh filters on cheaper hose-end sprayers. Shake the jug well, and mix in a separate bucket before adding to your sprayer.

Who should buy this

• Owners of warm-season grasses (bermuda, zoysia, St. Augustine) dealing with summer stress or high foot traffic — this is your offseason tonic.
• Anyone who’s already done a soil test and knows their K is low. Don’t guess; test first.
• Overseeders and new-lawn builders — potassium supports germination and seedling strength better than any nitrogen push.

Skip it if your lawn’s issue is actually iron deficiency (yellowing between veins, not edges) or if you’re looking for an all-in-one complete fertilizer. This does one thing.

FAQ

• Can I mix this with other fertilizers? Yes, but keep it separate from calcium-based products — they’ll react and precipitate. Apply 24 hours apart.
• How often should I apply? Every 4–6 weeks during the growing season. For dormant-season stress recovery, two applications, 3 weeks apart, is plenty.
• Will this burn my lawn? At the label rate, no — soluble potash is gentle on foliage. Overdosing just wastes money, not damage turf.

The Verdict
Buy it if you’ve confirmed a potassium deficiency and want a targeted, no-nonsense fix. Skip it if you need a balanced fertilizer or you’re unwilling to do a soil test first. At 4.6/5, this is the right tool for a specific job — and it does that job without fluff.

Where to Buy

👉 Check Price on Amazon →

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Last updated: 2026-08-06. Ratings and prices current as of review date. Verify on Amazon before purchasing.