Specs are compiled from manufacturer listings and verified buyer reviews and can change over time — please confirm the key details on the product page before buying.
A lawn turning yellow is like a check-engine light for your soil — it is almost always a nitrogen shortage. A high-nitrogen fertilizer delivers that deep, dark green color you are chasing without the guesswork, but the numbers on the bag (24-0-6, 32-0-5, 28-0-12) make the difference between a quick flush of green and a season of steady growth. The right one brings your grass back within a week; the wrong one either burns it or fades before the mower cuts again. Here is the short version: the best lawn fertilizer high in nitrogen is the one whose release rate matches your schedule — fast-release for a rescue job, slow-release for a set-and-forget season.
I’m Rikta — the founder and writer behind Lawn Gear Lab. This guide is built by comparing the manufacturers’ published specifications and the patterns across verified customer reviews, so you get each pick’s real strengths and trade-offs instead of marketing spin.
Whether you are repairing brown patches after a dry spell or giving your Bermuda that golf-course finish, finding the right lawn fertilizer high in nitrogen means matching your grass type, yard size, and how much time you want to spend spreading it.
Our Picks at a Glance
How to Choose a High-Nitrogen Fertilizer
High-nitrogen fertilizers carry a first N-P-K number of 20 or higher (like 30-0-0, 29-0-4, or 24-0-6). That number is the percentage of nitrogen by weight, and it tells you how aggressive the green-up will be. But nitrogen alone is only half the picture — the release type, the iron content, and the spreader setting determine whether your lawn looks thick or scorched.
N-P-K Ratio and Release Speed
A 32-0-5 formula dumps a lot of nitrogen fast, which is excellent for reviving a yellow lawn but risky in hot weather — too much quick-release can burn the grass. Look for slow-release nitrogen (polymer-coated or Bio-Nite) that meters out the feeding over weeks. The bag should state a percentage of slow-release nitrogen; 63% or higher means you get steady growth without surge patterns.
Iron for Color, Not Just Growth
Iron (listed as Fe or a percentage like 2% or 5%) helps chlorophyll production, which gives grass that deep blue-green shade without forcing excessive leaf height. A fertilizer with 3% iron, for example, darkens your lawn while keeping growth manageable — meaning fewer trips with the mower.
Granular vs. Liquid
Granular fertilizers need a spreader and watering-in, but they provide even coverage over large areas (up to 10,000 sq. ft. with a 40-pound bag). Liquids are faster to apply with a hose-end sprayer and work well for spot-treating nitrogen-deficient patches, but they may need reapplication every 4-6 weeks.
Quick Comparison
| Model | Best For | N-P-K Ratio | Coverage | Weight | Amazon |
|---|---|---|---|---|---|
| Yard Mastery 24-0-6 Flagship★ Best Overall | Best Overall | 24-0-6 | 6,000 sq. ft. | 18 lb | Amazon |
| The Andersons Deep Green 24-0-11Heavy Duty Pick | Large Yards & Heat | 24-0-11 | 10,000 sq. ft. | 40 lb | Amazon |
| GreenView Fairway Formula 30-0-12 | Steady 12-Week Feed | 30-0-12 | 5,000 sq. ft. | 16.5 lb | Amazon |
| Petramax Liquid Nitrogen 28-0-0 | Fast Liquid Green-Up | 28-0-0 | 6,400-12,800 sq. ft | 2 lb | Amazon |
| The Andersons Premium 28-0-12 | Heat Stress Defense | 28-0-12 | Full | 18 lb | Amazon |
| Jonathan Green Green-Up 29-0-3 | Reliable Quick Green | 29-0-3 | 5,000 sq. ft. | 15.6 lb | Amazon |
| Pennington Full Season 32-0-5 | Budget Full Season | 32-0-5 | 4,000 sq. ft. | 11.2 lb | Amazon |
In-Depth Reviews
1. Yard Mastery Flagship Granular Lawn Fertilizer 24-0-6 with 3% Iron, Bio-Nite™ (18 lb)
Our pick — over 4.5★ from 600+ verified ratings; the strongest balance of quality and price.
The crowd favorite that turned a patchy brown lawn deep green in a week.
This 24-0-6 Flagship fertilizer combines 24% nitrogen with 6% potassium and includes 3% iron for that blue-green color everyone wants. The Bio-Nite technology acts as a slow-release nitrogen system, meaning you get steady feeding across the season rather than a short-lived flash. The 18-pound bag covers a solid 6,000 square feet of lawn, and the 24% slow-release nitrogen ensures the grass keeps growing without surge patterns that demand extra mowing. People rave about the quality more than any other aspect — buyers often say their neighbors ask which lawn care service they use because the difference is that obvious on the street. The key spec to know here is the 18 pounds of weight compared to the 11.2 pounds of the Pennington 32-0-5.
Flagship granular green-up: The results come fast — buyers report a dead, patchy lawn bouncing back to full deep green within a week using this stuff. The 3% iron plus the slow-release nitrogen means the color lasts, and the grass thickens up rather than just shooting up tall and thin.
quick greening: You want the strongest all-around nitrogen boost with iron for deep color and a moderate coverage area for most home lawns.
burn potential: You have a very large lawn (over 6,000 sq. ft.) and want a single bag to cover it all — you will need two bags here.
2. The Andersons Deep Green 24-0-11 Professional-Grade Lawn Fertilizer (40 lb)
Professional-grade coverage that keeps your lawn green through the dog days of summer.
The Andersons Deep Green is a 40-pound professional-grade granular fertilizer with an N-P-K ratio of 24-0-11 and 2% iron plus manganese to intensify green color by supporting chlorophyll production. It is designed to prevent yellowing and lawn stress during hot months, so your turf holds its color even when temperatures spike. The bag contains both quick- and slow-release nitrogen for uniform growth extended feeding — up to 8 weeks between applications. With a coverage area of up to 10,000 sq. ft., this is the pick for large yards. The thing owners praise most is the greening effect — 12 buyers specifically call it out, and many describe the results as “extremely noticeable.” You should water it in after spreading to avoid the dark-stripe effect from overlapping passes.
Deep green heat defense: The 24-0-11 formula delivers potassium (11) that helps grass tolerate drought and heat stress, which most high-nitrogen-only products lack. The added manganese supports the iron in deepening color even further.
summer survival: You have a large lawn (up to 10,000 sq. ft.) and need a single bag that handles the whole summer stress period.
budget pick: You want a quick results — the slow-release design means you won’t see the full effect for about a week, not 24 hours.
3. GreenView Fairway Formula Lawn Fertilizer 30-0-12 (16.5 lb)
The 12-week feeder that keeps the lawn thick without burning.
GreenView Fairway Formula is a 30-0-12 NPK fertilizer with 63% slow-release nitrogen, meaning it feeds continuously for up to 12 weeks in one application. The 16.5-pound bag covers 5,000 square feet and the granules are unusually small, which gives you more even coverage when you run a spreader — no accidental stripes from overlapping. The formula contains no phosphate to protect waterways, and the ferrous sulfate adds iron for color without pushing excess leaf growth. Owners consistently call this their go-to granular fertilizer, noting the grass perks up in about a week and grows quickly, but the slow nitrogen prevents that lanky, weak growth you get from fast-release
Fairway steady feed: The 12-week feeding window is the headline — one bag handles nearly an entire growing season on a medium lawn, which saves you time and money compared to a monthly application schedule.
sustained growth: You want a low-maintenance fertilizer that keeps feeding for months and works on all grass types including Bermuda and St. Augustine.
immediate results: You need immediate results for a patchy lawn — the slow-release formula takes about 7 days before you see visible green-up.
4. Petramax Liquid Nitrogen Fertilizer 28-0-0 (32 oz)
The liquid jolt that turns yellow grass green in days.
Petramax is a 28-0-0 liquid nitrogen fertilizer formulated with a 2-in-1 release technology: 70% quick-release nitrogen for rapid green-up and 30% slow-release for ongoing feeding between applications. The 32 oz bottle treats up to 12,800 sq. ft. for maintenance or 6,400 sq. ft. for nitrogen-deficient lawns — just mix 5 oz per gallon for maintenance or 10 oz per gallon to correct deficiency. Liquids work differently than granules: you apply them with a hose-end sprayer, so the nitrogen hits the soil immediately without needing rain activation. Effectiveness is the top mention by a wide margin — 65 owners praise it, making it the most-discussed aspect of this product. The price-per-application is higher than granular, but the convenience of a spray-and-go bottle wins fans who want to treat a patch without hauling out a spreader.
Liquid fast nitrogen: The 70% quick-release component means you see results within 2-3 days, not a week. This makes it ideal for reviving yellow patches or giving a quick boost before a gathering.
rapid boost: You need to fix nitrogen deficiency fast on a small-to-medium lawn with minimal effort.
low maintenance: You prefer a single application that lasts months — this liquid needs reapplying every 4-6 weeks for sustained results.
5. The Andersons Premium Lawn Food 28-0-12 (18 lb)
Builds grass toughness for the brutal summer months.
The Andersons Premium Lawn Food brings a 28-0-12 ratio that combines high nitrogen with 12% potassium to help your lawn stand up to summer heat, drought, and foot traffic stress. It includes both quick- and slow-release nitrogen for fast green-up extended feeding, plus iron for deep greening and to prevent yellowing during heat waves. This is labeled as Application 3 of The Andersons Lawn Program, so it fits best as a mid-to-late season feed. Owners consistently say the lawn looks awesome after application and report that yellow areas turn greener within days of watering in the product. A buyer described switching from big-box brands to this product and seeing noticeably deeper color in healthy areas after just one application. Like other Andersons products, it needs watering-in within 12 hours for best results — buyers stress this point loudly.
Premium heat resilience: The potassium (12) in this mix is the key defender against summer stress — most high-nitrogen fertilizers neglect this, leaving grass vulnerable during drought periods.
heat stress: You are in a hot climate or have sandy soil that drains potassium quickly and want to keep your lawn resilient through August.
cool season: You want an all-season fertilizer rather than a mid-season refresh — this one works best when applied as part of a multi-step program.
6. Jonathan Green Green-Up Lawn Food 29-0-3 (15.6 lb)
A reliable granular that turns your lawn the envy of the block.
Jonathan Green Green-Up is a 29-0-3 granular fertilizer delivering high nitrogen with a small amount of potassium (3) for balance. The 15.6-pound bag covers 5,000 sq. ft., and the brand is well-known for consistent, straightforward formulas that work without gimmicks. Owners mention the yard has never been greener after applying it, with one noting it produces the best lawn in the neighborhood. Effectiveness is the most-discussed positive aspect — 6 owners praise it specifically. The grass appearance score sits mixed in the review data, however, which means some users expected even more dramatic visual results. The 29 nitrogen content is among the highest on this list, so it delivers a serious blast of green when applied at the correct spreader setting — the key is not to overlap and to water in thoroughly to avoid burn.
Green-Up simple feed: At 29-0-3, the nitrogen percentage is high and the potassium is minimal, so this is a pure green-up formula rather than a balanced lawn food. Works well for a mid-spring application when grass is actively growing.
basic feeding: You want a simple high-nitrogen granular from a trusted brand for a quick seasonal green-up.
high traffic: You have a lawn under summer heat stress — the low potassium (3) means less heat protection, so pair it with a separate stress product if needed.
7. Pennington Full Season Lawn Fertilizer 32-0-5 4M (11.2 lb)
One application, four months of feeding, and the highest nitrogen level on this list.
Pennington Full Season uses a 32-0-5 N-P-K ratio with polymer-coated urea that slowly releases nitrogen for up to 4 months — truly a single-application-per-season formula. The 11.2-pound bag covers approximately 4,000 square feet and includes 5% iron, the highest iron percentage among these picks, for deep greening and soil revitalization with natural beneficial microorganisms. Buyers consistently report turning distressed lawns lush dark green after applications, with one Bermuda owner saying it made their yard look like a golf course. The 32-0-5 ratio provides 32% nitrogen compared to 30% for the GreenView 30-0-12, making it the most nitrogen-dense formula here per unit weight. But the 11.2-pound bag covers less area than the heavier options — some users note it really covers closer to 2,000-2,500 sq. ft. if you spread at the recommended rate for heavy feeding.
Full season nitrogen: With 32% nitrogen and 5% iron, this is the most concentrated green-up formula available — ideal for a quick, dramatic transformation on a smaller lawn.
maximum nitrogen: You want the highest nitrogen percentage available and a full-season single application on a lawn under 4,000 sq. ft.
safe application: You have a medium-to-large lawn — the 11.2 lb bag covers less area than the label suggests, so you may need two bags.
Understanding the Specs
N-P-K Ratio: The First Number
The three numbers on the bag (e.g., 30-0-12) represent the percentage of nitrogen (N), phosphorus (P), and potassium (K) in the bag. For a “high nitrogen” fertilizer, the first number must be 20 or higher. Nitrogen drives leaf growth and the green color from chlorophyll production. The second number (phosphorus) is often zero in lawn fertilizers because established lawns do not need it, and it can run off into waterways. The third number (potassium) helps the grass tolerate heat, drought, and disease — the higher it is (like 12), the more stress protection you get.
Slow-Release vs. Quick-Release Nitrogen
Quick-release nitrogen (usually ammonium nitrate or urea) provides an immediate green-up within days but can burn the lawn if applied in hot weather. Slow-release nitrogen (polymer-coated urea, sulfur-coated urea, or Bio-Nite) meters out the feeding over 6-12 weeks, giving steady growth without surges. A bag should state the percentage of slow-release nitrogen — 63% or higher means you apply less often and reduce the risk of burn. The fastest green-up is quick-release liquid; the safest long-term feed is granular slow-release.
FAQ
How often should I apply high-nitrogen fertilizer during the growing season?
Will high-nitrogen fertilizer burn my lawn?
What is the difference between 24-0-6 and 32-0-5?
Can I use high-nitrogen fertilizer on all grass types?
How much does a 40-pound bag of high-nitrogen fertilizer cover?
Should I water the lawn after applying high-nitrogen granular fertilizer?
Can I mix high-nitrogen liquid fertilizer in a sprayer?
How does iron in fertilizer help the lawn?
Final Thoughts: The Verdict
For the majority of shoppers, the lawn fertilizer high in nitrogen winner is the Yard Mastery Flagship 24-0-6 because it combines high nitrogen with 3% iron and Bio-Nite slow-release technology in an 18-pound bag that covers 6,000 square feet — the best balance of green-up speed, feeding duration, and value. If you want four months of feeding from a single bag, grab the Pennington Full Season 32-0-5. And for a fast-acting liquid rescue that works in days, the Petramax Liquid Nitrogen 28-0-0 is the one to reach for.
How We Picked
We do not accept paid placement. Every pick is matched to a real buyer and a real use-case; we do not hands-on test units.
Sources & Methodology
Specifications: manufacturer listings and product documentation. Review insights: verified customer reviews, as of July 2026. Pricing: not shown on this page (it changes often); check the current price via the retailer link.
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