Best Slow Release Fertilizer For Lawns

#1 · Best Overall

1. Pennington Full Season

• Form: Granules
• Weight: 11.2 lb
• Warranty Description: Warranty

Best for: One-application seasonal nitrogen feeding.

Why it ranks #1: Polymer-coated urea releases nitrogen for up to four months, with iron for deep greening and coverage options up to 12,000 square feet.

Polymer-coated urea releases nitrogen for up to four months in Pennington Full Season Lawn Fertilizer, enabling a single application to feed for a season. Added iron supports deep green color, while beneficial microorganisms are included to revitalize lawn soil.

The controlled-release nitrogen helps extend feeding instead of requiring repeated applications within that stated four-month window. Iron supports deeper greening, so the formula pairs sustained growth nutrition with color support. Pennington lists Kentucky bluegrass, tall fescue, Bermudagrass, Zoysiagrass, and more among compatible grasses. Apply with a spreader according to package directions; coverage depends on bag size, with options stated for up to 4,000 or 12,000 square feet.

Skip it if you live in Hawaii or South Dakota, where this product is unavailable; Scotts Turf Builder WinterGuard Fall Lawn Food is listed for any grass type.

Pennington suits lawn owners seeking one seasonal application, controlled-release nitrogen, and added iron, with several grass types listed. Check regional availability before planning around it; it is not available in Hawaii or South Dakota.

Listed on Amazon as: Pennington Full Season Lawn Fertilizer 4M 32-0-5 RF 3/11.2Lb

#2 · Long-Feed Formula

2. Eco Solutions 25-5-10

• Form: Granules
• Weight: 22 lb

Best for: Extended spring feeding for green lawns.

Why it ranks #2: Its 25-5-10 blend has 65% granular nitrogen and feeds for up to 110 days, making the stated duration unusually clear.

Up to 110 days of feeding from a formula with 65% granular nitrogen is the central feature of Eco Solutions Slow Release Lawn Fertilizer. Its 25-5-10 blend is positioned to support quick and steady growth, helping revive tired lawns while sustaining green color.

The extended feeding window can reduce how often homeowners need to apply fertilizer during the stated period, while the 25-5-10 NPK blend supplies the product’s listed nutrient profile for lawn growth. The formula is described as a starter fertilizer and lawn food for reviving tired grass. Its product title and key features state kid- and pet-safe use, but the safety directions still say to keep it out of reach and avoid skin and eye contact.

Skip it if you want an autumn-specific root-preparation formula; Scotts Turf Builder WinterGuard Fall Lawn Food targets fall feeding and winter readiness.

Eco Solutions fits homeowners seeking a long feeding window and a 25-5-10 formula for tired lawns. Follow its handling directions despite the stated kid- and pet-safe positioning, and apply during calm weather to limit drift.

Listed on Amazon as: Slow Release Lawn Fertilizer 25-5-10 NPK – 65% Granular Nitrogen Formula for Deep Feeding up to 110 Days – 10kg (22lbs) Bag – Kid & Pet Safe Lawn Care for Lush Green Grass

#3 · Large Lawn Coverage

3. GreenView Fairway Formula

• Form: Granules
• Weight: 33 lb
• Warranty Description: Lebanon Seaboard Corporation guarantees you…

Best for: Large-lawn feeding for up to 12 weeks.

Why it ranks #3: The 33-pound bag covers 10,000 square feet, and its 63% slow-release nitrogen feeds grass for up to 12 weeks.

A 33-pound bag covers 10,000 square feet, pairing substantial lawn coverage with 63% slow-release nitrogen that feeds for up to 12 weeks. GreenView Fairway Formula also combines immediate and controlled-release nutrition for consistent feeding without surge patterns.

The coverage makes this bag suited to medium and large lawns, while the extended-release nitrogen supports ongoing nutrition for up to 12 weeks after application. Immediate-release nutrients are combined with controlled-release feeding, linking an initial supply with steadier growth. The product is listed for all grass types and can be applied whenever turf is actively growing; spring is described as a common application time. Instructions say not to hand spread, so use a suitable spreader.

Skip it if you need a fall-specific root-preparation fertilizer; GreenView Fairway Formula Fall Lawn Fertilizer focuses on summer repair and winter readiness.

GreenView Fairway Formula suits medium to large lawns needing broad coverage and extended feeding during active growth. It can be used beyond spring, but its instructions prohibit hand spreading, so plan for spreader application.

Listed on Amazon as: GreenView Fairway Formula Lawn Fertilizer 33 lb. Bag, Covers 10,000 sq. ft.

#4 · Micronutrient Blend

4. HyR BRIX 22-7-7

• Form: Granules
• Weight: 45 lb

Best for: Micronutrient-rich feeding for dense turf.

Why it ranks #4: Its slow-release 22-7-7 formula includes listed micronutrients such as iron, manganese, and zinc, with coverage of 5,600 square feet.

A 22-7-7 analysis paired with essential micronutrients distinguishes HyR BRIX Slow-Release Lawn Fertilizer, which is described as supporting roots and long-lasting green color. Its slow-release formula encourages dense growth that can naturally crowd out weeds, with coverage listed at 5,600 square feet.

Gradual nutrient delivery is intended to provide consistent nourishment and sustained green color, while the micronutrients and trace elements support overall lawn health and stronger roots. The product’s dense-growth focus connects lawn feeding with naturally crowding out weeds, rather than relying on a stated weed-control ingredient. Its 45-pound bag covers 5,600 square feet. Listed ingredients include encapsulated urea, iron sulfate, manganese sulfate, zinc sulfate, and humic acids derived from leonardite.

Skip it if you need a lighter bag for a smaller lawn; Scotts Turf Builder WinterGuard Fall Lawn Food comes in a 10-pound bag for fall use.

HyR BRIX fits buyers seeking slow-release feeding, micronutrients, and denser turf across a 5,600-square-foot area. Its weed benefit is crowding through grass growth, not a listed herbicide function, so it is not a weed-control treatment.

Listed on Amazon as: Slow-Release 22-7-7 Lawn Fertilizer, 45lb Bag – Lawn Food with Essential Micronutrients – Promotes Dense, Healthy Grass & Long-Lasting Green – Covers 5,600 Sq Ft

#5 · Low-Salt Formula

5. Milorganite 6-4-0

• Form: Pelletized
• Weight: 32 lb

Best for: Low-salt feeding with printed guidance.

Why it ranks #5: This pelletized fertilizer is described as slow-release and virtually salt-free, with organically complex iron for deep green color.

A printed seasonal feeding and spreader-tips brochure comes with Milorganite’s 32-pound bag, giving buyers application guidance alongside a slow-release fertilizer. Its virtually salt-free formula is intended to help avoid streaks, stripes, and fertilizer burn, including in hot or dry conditions.

Organically complex iron supports deep green color without staining concrete in the way iron salts in some synthetic fertilizers can. The low-salt formula also addresses concerns about streaking and burn during hot or dry weather. This bundle includes a brochure with seasonal application and spreader tips, useful for planning feeding and application. The pelletized fertilizer is made from heat-dried microbes; it has an earthy aroma when first applied, which should dissipate within a few days.

Skip it if you want a stated nitrogen-release duration or a single seasonal application; Pennington Full Season Lawn Fertilizer feeds up to four months.

Milorganite fits lawn owners who value feeding guidance, low-salt application, and iron-supported greening. Account for its earthy aroma after spreading, and store the fertilizer in a cool, dry place out of reach of children and animals.

Listed on Amazon as: Milorganite 6-4-0 Fertilizer and Feeding Tips Brochure Bundle, 32lb

#6

6. Fertilome Classic Lawn Food

• Form: Granules
• Weight: 1.5 lb
• Warranty Description: Warranty

Best for: Two-month slow-release lawn feeding.

Why it ranks #6: The 16-0-8 formula uses slow-release nitrogen and states that one application lasts up to two months for southern and cool-season grasses.

Up to two months of slow-release nitrogen makes ferti-lome Classic Lawn Food a straightforward option for homeowners seeking a defined feeding interval. Its 16-0-8 formula is described for southern and cool-season grasses, with drop or broadcast spreaders providing the listed application methods.

The slow-release nitrogen is intended to promote nutrient uptake by lawn grasses, while the formula’s 8% soluble potash complements its 16% nitrogen content. A stated application rate of four pounds per 1,000 square feet gives spreader users a defined starting point from the product information. The listed coverage is 5,000 square feet per bag, and one application lasts up to two months. It is framed for both southern and cool-season grasses.

Skip it if you want feeding that lasts up to four months; Pennington Full Season Lawn Fertilizer lists controlled-release nitrogen for that longer period.

Ferti-lome fits owners of southern or cool-season lawns who want a spreader-applied 16-0-8 formula and a defined two-month feeding period. Consider the shorter stated duration when planning a season-long schedule.

Listed on Amazon as: Fertilome (13730) Classic Lawn Food 16-0-8 Slow Release, 16 lbs

#7

7. Andersons Premium Fall Food

• Form: Granules
• Weight: 18 lb

Best for: Fall program feeding with iron.

Why it ranks #7: It combines quick-, intermediate-, and slow-release nitrogen with iron and potash, but its stated purpose is fall lawn preparation.

Three nitrogen release speeds—quick, intermediate, and slow—give The Andersons Premium Fall Lawn Food both fast green-up and extended feeding. As Application 4 of The Andersons Lawn Program, it also includes potash and iron to support winter preparation and deeper green color.

The quick-to-slow nitrogen blend connects an initial green-up with ongoing nourishment, while the fall timing supports feeding and preparing turf for winter. Potash is described as thickening grass wall structure to make it hardier and more vigorous; iron aids chlorophyll development and helps prevent yellowing. The formula is listed as safe for all turf types. Handling directions call for gloves, long sleeves, and eye protection, and recommend cool, dry storage away from heat sources and open flames.

Skip it if you want fertilizer without a numbered program context; GreenView Fairway Formula Fall Lawn Fertilizer is also a fall-focused lawn food.

The Andersons suits buyers following its lawn program or seeking fall feeding with multiple nitrogen release speeds, potash, and iron. Its Application 4 designation and protective handling directions are important considerations before use.

Listed on Amazon as: The Andersons Premium Fall Lawn Food 24-0-14 Fertilizer 5,000 sq ft Bag

#8

8. GreenView Fall Fertilizer

• Form: Granules
• Warranty Description: Lebanon Seaboard Corporation guarantees you…

Best for: Even greening for fall lawn repair.

Why it ranks #8: This fall formula supports root growth and steady greening, but the supplied details do not specify a slow-release percentage or duration.

Steady, even greening without surge growth is the defining promise of GreenView Fairway Formula Fall Lawn Fertilizer. Its fall-focused feeding supports summer-damage repair, deep roots, and preparation for winter, making it a seasonal option for homeowners working toward a stronger spring lawn.

The formula is described as encouraging deep root growth alongside thick, lush growth and lawn color, connecting fall feeding with both below-ground preparation and visible turf improvement. Its steady-green approach avoids surge growth, which may suit buyers seeking an even appearance rather than a sudden flush. GreenView lists it for any grass type. The product information also says not to hand spread and advises keeping unused fertilizer safely stored and out of reach of children.

Skip it if you apply fertilizer by hand rather than using a spreader; The Andersons Premium Fall Lawn Food is another fall lawn-feeding option.

Choose GreenView for fall prep focused on root growth, summer repair, and even greening across grass types. It is a poor fit for hand application, so plan to use an appropriate spreader and store leftovers safely.

Listed on Amazon as: GreenView Fairway Formula Fall Lawn Fertilizer, 22.5 lb. Bag

#9

9. Scotts WinterGuard Fall Food

• Form: Granules
• Weight: 8 oz
• Warranty Description: Warranty

Best for: Fall root-prep for smaller yards.

Why it ranks #9: It is designed for fall feeding and deep root growth, but the supplied product facts do not establish a slow-release feature or feeding duration.

Fall application is the defining feature of Scotts Turf Builder WinterGuard: it feeds roots as lawns recover from summer heat, drought, and activity, while preparing for winter. The granular formula can go on wet or dry grass, giving homeowners flexibility when fitting lawn care into autumn weather.

Its focus on strong, deep roots connects fall feeding with the stated goal of a better lawn next spring. The product also supplies nutrients to support recovery from summer stress, so one seasonal application addresses both repair and winter preparation. Scotts lists use on any grass type, and says a Scotts spreader can apply it to a wet or dry lawn. For faster results, lightly water it in; watering is not required.

Skip it if you need a spring or all-season feeding window; Pennington Full Season Lawn Fertilizer releases nitrogen for up to four months.

Choose Scotts for fall lawn care aimed at root preparation, summer-stress recovery, and winter readiness across grass types. It suits smaller yards, but its timing is specifically autumn rather than a spring feeding schedule.

Listed on Amazon as: Scotts Turf Builder WinterGuard Fall Lawn Food, 10 lbs.

#10

10. Hi-Yield Premium Lawn Fertilizer

• Form: Granules
• Weight: 21 lb
• Warranty Description: Warranty

Best for: Quick greening for spreader applications.

Why it ranks #10: Its 15-5-10 analysis and 5,000-square-foot coverage are specified, but no slow-release claim or extended feeding period is provided.

Quick deep-green results and use on all lawn and turf grass types are the main claims for Hi-Yield New Process Premium Lawn Fertilizer. Its 15-5-10 granular formula covers up to 5,000 square feet per 20-pound bag when applied evenly with a drop or broadcast spreader.

The 15% nitrogen supports the stated rapid green appearance, while 10% soluble potash and 5% phosphate complete the listed nutrient analysis. Spreader application at four pounds per 1,000 square feet provides a specified rate, and watering in well is part of the directions. The product can be used on all lawn types, but instructions limit use to no more than four applications during the growing season and note that it may discolor pavement and concrete.

Skip it if you want a stated slow-release feeding duration; GreenView Fairway Formula Lawn Fertilizer feeds for up to 12 weeks.

Hi-Yield suits buyers prioritizing quick greening, broad grass-type compatibility, and spreader-based application. Its directions require watering in and even coverage, while the pavement-discoloration warning matters when working beside concrete.

Listed on Amazon as: Hi-Yield (32020) New Process Premium Lawn Fertilizer 15-5-10, 20 lbs