Simple Lawn Solutions 16-4-8 Review: Results, Rate, and How to Apply (2026)
James ThorntonLawn Equipment & Maintenance Expert | 20 YearsAs an Amazon Associate we earn from qualifying purchases.
Simple Lawn Solutions Advanced 16-4-8 is the liquid lawn fertilizer most people land on first, and for good reason. It is the brand's flagship, it shows up as the "best overall" liquid in most roundups, and the balanced 16-4-8 ratio is the closest thing the lawn world has to a do-everything feed. After running it through a hose-end sprayer across a few seasons, here is the honest read on what it does well, where it falls short, and who should actually buy it.
If you are still deciding between formulas rather than reviewing this one specifically, start with our best liquid lawn fertilizer guide, which ranks the whole field by need.
What is actually in the bottle
The headline is the 16-4-8 ratio: 16 percent nitrogen, 4 percent phosphorus, 8 percent potassium. That is a textbook 4-1-2 lawn ratio, which means plenty of nitrogen for color and growth, a little phosphorus for roots, and enough potassium for stress tolerance. It works on every common grass type, warm and cool season, through the spring and summer growing window.
What separates Simple Lawn Solutions Advanced 16-4-8 from a bargain liquid is the supporting cast. The formula folds in seaweed and humic acid, so beyond the three macros you are improving nutrient uptake and feeding soil biology rather than just dumping nitrogen on the lawn. The 32 ounce bottle ships with the sprayer attached, which is the part that makes even application genuinely easy.
How to apply it (and the right rate)
The 32 ounce bottle covers up to 3,200 square feet, and the attached hose-end sprayer meters the concentrate as you spray, so you are not mixing or measuring. Connect the hose, set it to spray, and walk an even pattern with a slight overlap on each pass. Striping almost always comes from uneven coverage, not the product.
A few rules keep it from burning, which is rare with a liquid but still possible in heat. Apply to a dry, recently mowed lawn in the cool of the day, ideally under 80 degrees. Give most macro feeds a light watering afterward to move the nutrients to the roots. Then repeat every two to four weeks during active growth, since a liquid feed does not last as long as a granular. To dial in the exact rate for your lawn size, run it through the fertilizer calculator.
What to expect
Color shows up fast. Because liquid nutrients are taken up through the leaf as well as the roots, you typically see a noticeable green-up within a few days to a week, well ahead of the two to three weeks a granular takes. The flip side is longevity: plan on feeding every two to four weeks rather than every six to eight, so this is a little-and-often product, not a set-it-and-forget-it one.
The honest cons
Two things to go in knowing. First, coverage. At up to 3,200 square feet per bottle and a feeding every few weeks, a larger lawn goes through bottles, so the per-season cost adds up faster than it looks at the shelf price. Second, it is not a replacement for a slow-release backbone if you want the lowest-effort program. Many people get the best of both by running a granular slow-release as the base and spiking with this liquid for a fast correction or summer color.
How it compares
Against other liquids, the 16-4-8 is the generalist. If your lawn is hungry and pale and you want maximum color, a high-nitrogen Simple Lawn Solutions Maximum Green 28-0-0 pushes harder. If you are feeding established turf through summer heat or live in a phosphorus-restricted area, a phosphorus-free 15-0-15 is the better match. Against a granular 16-4-8 like The Andersons PGF Complete, the trade is speed and ease of application versus longevity per feeding. None of them is wrong; they solve different problems.
Who should buy it
If you want one liquid that handles routine spring and summer feeding on any grass type, and you like the idea of spraying rather than spreading, this is the easy pick. If you have a very large lawn and want to minimize how often you feed, lead with a slow-release granular and keep a bottle of the 16-4-8 on hand for quick green-ups. Either way it is a sound, well-formulated choice that earns its reputation as the default liquid.
Frequently asked questions
- Is Simple Lawn Solutions 16-4-8 worth it? For a balanced, easy-to-apply liquid that works on any grass type, yes. It delivers fast color, includes seaweed and humic acid, and comes with a hose-end sprayer. The main caveat is that liquids feed for two to four weeks, so a large lawn uses several bottles per season.
- How often should you apply 16-4-8 liquid fertilizer? Every two to four weeks during the active growing season. Liquids feed faster but for a shorter window than slow-release granular, so they reward a lighter, more frequent schedule.
- Does 16-4-8 liquid need to be watered in? A light watering after application helps move the nutrients to the roots. Follow the label, and avoid feeding in the heat of the day to prevent any burn.
- What grass types can use 16-4-8? All common types, warm and cool season alike (Bermuda, St. Augustine, Zoysia, centipede, fescue, ryegrass, Kentucky bluegrass). It is an all-purpose maintenance ratio.
For the full set of liquid options ranked by need, see the best liquid lawn fertilizer guide, and for the bigger picture on feeding your lawn across the year, start with the complete fertilizing guide.
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