Milorganite
Milorganite Professional Grade Turf Grass Fertilizer 6-4-0 2.5% Fe- 50 lb (90 SGN)
Best organic fertilizer for homeowners seeking lush, low-maintenance landscape growth.
Elevate your lawn care with Milorganite Professional Grade Turf Grass Fertilizer. This 50 lb bag delivers a slow-release nitrogen formula, ensuring extended feeding for robust turf growth. Its balanced 6-4-0 NPK ratio, combined with 2.5% iron, promotes healthy greening. Enriched with calcium, it helps neutralize acidic soils, making it safe for lawns, vegetables, flowers, trees, and shrubs. This organic fertilizer is ideal for spreading grass seed and covers up to 3,000 square feet, providing consistent, high-quality results for your entire landscape.
$28.26
Owner Satisfaction
4.7
/ 5
Category Rank
50
/ 4425
#50 in Fertilizers
Price vs Category Average
-54%
Below average
NPK Ratio
640
/ --
Who it's for
- Eco-conscious caretakers prioritizing long-term soil and microbe health
- Homeowners worried about accidental lawn damage or burning
- Gardeners seeking vibrant, dark green turf without rapid growth
Who should skip it
- Budget-focused shoppers comparing the cost of actual nitrogen delivery
- Users wanting to minimize the physical labor of heavy spreading
- Sensitive neighbors bothered by strong, earthy organic smells
Performance breakdown
Nutrient Longevity
Slow-release formula ensures consistent growth without the risk of nitrogen burn.
Greening Efficacy
High iron content delivers a deep, vibrant color to tired turf.
Versatility
Safe for everything from delicate flowers to robust vegetable garden beds.
Application Precision
The 90 SGN particle size ensures uniform distribution through standard spreaders.
Soil Health Impact
Added calcium helps balance acidic soil profiles for better long-term vitality.
Seeding Compatibility
Acts as an ideal carrier for grass seed during new lawn establishment.
Key Specs
NPK Ratio
6-4-0
Iron Content
2.5% Fe
Package Weight
50 lb
Particle Size
90 SGN
Coverage Area
3,000 square feet
Nitrogen Insolubility
At least 85% water-insoluble (WIN)
Phosphorus Content
Not less than 4% available
Fertilizer Source
Organic
Features
- Slow-release nitrogen for sustained feeding
- Contains calcium to balance soil pH
- Safe for diverse plant types
- Effective grass seed carrier
- High water-insoluble nitrogen content
- Professional-grade turf nutrition
- Promotes greener, healthier lawns
What customers say
Customers consistently praise Milorganite for its exceptional reliability and ease of use. The slow release formula virtually eliminates the risk of burning the lawn, making application straightforward even for novice users. Reviewers frequently highlight the deep, consistent greening effect attributed to the iron content, noting that the results are predictable and long lasting. While some mention the distinct odor upon initial application, the consensus is that the superior, dependable quality makes this fertilizer a worthwhile investment for achieving professional grade turf.
Know before you buy
Yes, Milorganite is safe for use on vegetables, flowers, trees, and shrubs. Its organic formula provides gentle, sustained nutrition that won't burn your plants.
The high water-insoluble nitrogen content ensures that nutrients are released gradually over time rather than all at once. This provides consistent feeding for your grass, reduces the risk of surge growth, and minimizes the need for frequent applications.
Yes, the 2.5% iron content is specifically included to promote a deep, healthy green color. It helps improve turf density and vigor without forcing rapid, weak growth.
Absolutely. Because it is a slow-release organic fertilizer, it is gentle enough to be used as a carrier during seeding without damaging delicate new grass sprouts.
Yes, this formula is enriched with calcium, which helps neutralize acidic soil conditions. This creates a more balanced environment for your plants to absorb nutrients effectively.
SGN stands for Size Grade Number, and 90 SGN indicates a fine, uniform granular particle size. This ensures even distribution across your lawn when using a spreader, preventing streaking or uneven growth.
Still have a question?
Ask Hayley anything about this product before you decide.
Ready to buy?
$28