9 Best Slow Release Nitrogen Fertilizer For Lawns

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The affordable spring booster that greens Bermuda fast without the burn.

If you want one bag to handle the whole spring feeding without a multi-step program, this 16.5-pound GreenView is a strong candidate, and it covers a solid 5,000 square feet for the price. The formula is a high-nitrogen 30-0-12 blend, with a key detail: 63% of that nitrogen is slow-release, so your grass gets steady feeding for up to 12 weeks instead of a fast surge that fades. That slow-release design is why owners mention it holds up well even in extreme heat and greens up quickly without burning the lawn.

Small blue granules spread easily; owners recommend a low spreader setting to avoid burn, with visible results in about a week. It is phosphate-free, so it protects nearby waterways while still delivering the deep green look. The main trade-off, noted by a few owners with St. Augustine, is that some bare spots may need a second treatment to fully fill in, so this is best for an established lawn rather than heavy repair duty.

Compared to The Andersons pick above, this bag weighs in lighter at 16.5 pounds and costs less, making it the value play for medium to large yards that need comprehensive spring nutrition. For a bag that owners consistently call their “go to granular fertilizer,” the combination of price and 12-week feeding makes it a smart, budget-conscious choice.

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The one-application-per-season granular that makes your Bermuda look like a golf course.

This Pennington is built around a single bold promise: one application per season, thanks to polymer-coated urea that slowly releases nitrogen for up to 4 months, which is the longest feeding window on this list. It also packs a 5% iron content for deep greening and includes natural beneficial microorganisms that help revitalize soil health. For anyone tired of a 4-step program, the “one and done” approach is a genuine time-saver.

The 32-0-5 ratio delivers a heavy nitrogen punch, and customers note grass turning super green within a week, with one describing their Bermuda as looking like a golf course. It offers good value for the money and has helped stressed lawns recover without needing to be resodded, reviewers point out. Honest caveat: the bag weighs only 11.2 pounds, and some owners found it covers only 2,000-2,500 square feet in practice, not the advertised 4,000 square feet—so measure your yard carefully before buying.

That 11.2-pound weight makes it the lightest granular in this guide, so it is easier to handle, but you may need two bags for a larger yard. If you value convenience and a long feeding window over maximum coverage per bag, this is a compelling pick.

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The easy-pour liquid that turns yellow, nitrogen-starved grass thick and green.

If you prefer spraying over pushing a spreader, this 32-fluid-ounce liquid from Petramax offers a different route to the same lush result, and it is versatile enough for both warm- and cold-season grass. Its 28-0-0 formula splits the difference with an unusual 70% quick-release nitrogen for a fast green response and 30% slow-release nitrogen to keep feeding between applications, giving you the best of both worlds in one spray. You mix 5 oz per gallon of water for maintenance, or 10 oz per gallon to correct a nitrogen deficiency.

The liquid format makes it easy to treat hard-to-reach areas, and a single bottle treats up to 12,800 sq ft at the maintenance rate or 6,400 sq ft for nitrogen-deficient grass when mixed properly. Owners praise how quickly it greens up a lawn, with many saying their grass turned a rich, dark green shortly after spraying, and the ease of mixing into a standard sprayer is a recurring point of praise. The value-for-money verdict is a bit mixed, with some finding it on the pricier side relative to granular alternatives, but the results are consistently positive.

This is the only liquid on the list, setting it apart from the granular picks above. It is the right choice if you already own a sprayer and want a quick, targeted green-up. The 2-pound bottle is far lighter to handle than any 18-pound bag, making it ideal for smaller yards or spot treatments.

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The specialized feed that keeps centipede and St. Augustine deep green without the burn.

This Fertilome is built for a specific audience: owners of centipede, St. Augustine, and other warm-season grasses, and it delivers a balanced 15-0-15 formula with high iron plus slow-release nitrogen designed to reduce the risk of nitrogen burn. The high iron content is the key to preventing and correcting yellow grass foliage, giving you that fast super-green color. The 16-pound bag covers up to 5,000 square feet, and the label recommends applying 4 lbs per 1,000 square feet in early spring and early fall.

Shoppers say it works very well on lawns being repaired with new plugs, with one describing that not a single plug was lost and the grass became a much deeper green than the rest of the block. Feedback repeatedly mentions how well it performs on centipede grass specifically, delivering a thick, fast-growing lawn. It is also called out as good value for money, and the germination response is the most-praised aspect in the review data—making it a strong option if you are trying to establish or fill in a warm-season lawn.

The 15% nitrogen is lower than the other granular picks, but that is deliberate; warm-season grasses like centipede need less nitrogen, so this formula avoids the surge and stress that a 30% blend could cause. The trade-off is that it is a specialist product, so if you grow cool-season grass like fescue or bluegrass, this is not the right tool for the job.

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The fall-timed formula that repairs summer damage and carries green through winter.

This GreenView is the seasonal specialist of the group, purpose-built to repair summer damage, prepare your lawn for winter, and set up a better spring. It feeds for up to 12 weeks with a proprietary blend featuring 59% slow-release nitrogen, and it is phosphate-free to protect waterways. Owners who switched from a 4-step program to this 2-step approach report a deep green lawn within 2 weeks of a single fall application, with the color lasting through winter and into late spring, even under snow and cold.

The 22.5-pound bag covers a larger 7,500 sq ft, making it a strong value for bigger yards. One detail owners rave about is the moisture-proof packaging, which prevents the clumping that is common with other brands, so the granules pour out of the bag smoothly and spread evenly. The quality and effectiveness are consistently praised in the review data, particularly for fall application, with one owner noting the lawn stays green throughout winter. The main caveat is that it is priced higher than other fall fertilizers, though owners who have used it for three consecutive falls say the noticeable lawn health improvements justify the cost.

Compared to the spring-focused GreenView 30-0-12 above, this fall formula is about ensuring winter survival and next spring’s head start, so pick between them based on the season you are feeding for. If you live in a region with harsh winters, the winter-long color this delivers is a standout benefit.

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The targeted nitrogen fix for lawns that are clearly starving for green.

When your lawn has a specific nitrogen deficiency, this 32-0-0 formula from The Andersons is the direct remedy, delivering the highest nitrogen content on this list to fuel rapid greening. Like its sibling product, it uses both quick- and slow-release nitrogen, combined with the same small particle size for complete and uniform coverage, and it is safe for all turf types. The 18-pound bag covers a solid 6,000 square feet, and it can be applied any time during the growing season, which gives you flexibility.

Grass turns dark green within two weeks, with St. Augustine and Bermuda responding best. The feedback highlights thickened, greener grass and, in some cases, neighbors asking what lawn care service they use. Because it is a pure nitrogen product with no phosphate or potash, it is ideal if your soil test shows those other nutrients are already sufficient. The quality is consistently praised in the review data, and owners recommend it for its effective results.

Think of this as the focused tool versus the all-in-one 16-0-8 from the same brand; it is the right pick when nitrogen is the only thing your yard is missing. If you need a complete nutritional package including potassium and micronutrients, you would be better served by a blended formula.

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The 3% iron formula engineered for that rich, deep blue-green prize-winning color.

This Yard Mastery Flagship 24-0-6 is for the lawn enthusiast chasing that specific deep blue-green color, and the secret is the generous 3% iron content. It also includes 6% potassium, a suite of micronutrients like boron, copper, and zinc, plus 24% slow-release nitrogen for steady nourishment throughout the season, so you get color and health in one application. The 18-pound bag covers 6,000 square feet, and the all-natural Bio-Nite component enriches the soil.

Owners praise the rapid greening, with lawns turning thick and green and neighbors asking which lawn care company they hired. Some owners revived dead, patchy lawns in about a week, outperforming years of other treatments. This makes it a favorite for homeowners transitioning between grass types or dealing with stressed turf.

Compared to the pure nitrogen pick above, this formula is more complete, adding potassium and micronutrients alongside its 24% nitrogen, making it a better all-around choice for general lawn health. If you are happy with your current nitrogen levels but want a deeper, richer color, the iron here is the differentiator.

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The 45-pound giant that covers a full 15,000 square feet with one bag.

If you have a large property, this Jonathan Green Veri-Green is the practical answer. The 45-pound bag covers up to 15,000 square feet—the largest coverage on this list—so you make fewer trips to the store. The 29-0-3 analysis delivers high nitrogen for quick greening, plus iron for that deep-green color, and it feeds gradually for up to 3 months with a release that is not affected by excessive rainfall. Buyers report rich, thick green grass that lasts from late spring into early summer.

The formula is designed to yield a rich-green color within 7-14 days and includes iron for maximum greening while helping protect grass against drought. Owners who switched from a leading national brand note that this greens up a bit slower but the color is better and seems to last longer, and the granules flow well through a spreader without the clumping they experienced with other products. It works on any type of grass, though the label advises against applying when air temperatures are 85 degrees or higher if the lawn is under heat and drought stress.

For sheer value per square foot, this bag is tough to top for anyone with an acre or more of grass, since you are buying in bulk and saving on per-square-foot cost. If you have a small yard, the 45-pound weight is overkill, but for a big property, it is the most efficient way to feed your whole lawn.