Achieve a deep green, vigorously growing lawn with fast-acting nitrogen sources. This guide compares five ammonium-based products that boost turf color and growth while addressing soil conditions. Best for homeowners needing quick green-up, professional landscapers seeking uniform coverage, and gardeners aiming to improve soil acidity in alkaline soils. The table below highlights key details to help you choose wisely.
| Product | Main Benefit | Best For |
|---|---|---|
| Dark Matter 21-0-0 | Fast-acting green-up, fine prills, versatile for lawns, gardens, and ornamentals | Cool- and warm-season lawns, vegetable gardens, flower beds |
| The Grow Co 21-0-0 | High nitrogen with soil acidifying properties | Acid-loving plants in alkaline soil, rapid green color |
| Scotts Green Max Lawn Food | Dual-action with iron for quick greening | Any grass type needing fast, deep green color |
| Lawn Synergy 21-0-0 | Fast-acting nitrogen with added sulfur for soil health | Lawns needing rapid growth and improved soil |
| PLANTCO Ammonium Sulfate 21-0-0 | Quick acting nitrogen plus sulfur, soil pH lowering | Lawn and acid-loving ornamentals |
Note: Each product uses ammonium-based nitrogen and sulfur where applicable. Read label directions for application rates and safety guidelines before use. The following sections break down who each product is best for and why it stands out.
Dark Matter 21-0-0 Ammonium Sulfate Fertilizer
Fast-Acting Green-Up & Growth: Delivers a powerful nitrogen boost for rapid turf, garden, and plant growth, producing deep green lawns and vibrant ornamentals. Best for immediate color and growth in both cool- and warm-season grasses.
Why chosen: Ultra-fine prill formula enables smooth spreader application with quick absorption, making it ideal for uniform coverage across large lawns and mixed plantings.
Caution: High nitrogen demand can stress newly seeded areas; follow label directions for timing and rates to avoid leaf burn.
Ammonium Sulfate 21-0-0 Fertilizer, The Grow Co
High Nitrogen with Sulfur: Contains 21% nitrogen and 24% sulfur to support greener growth and soil health. Best for acid-loving plants and alkaline soils seeking pH reduction.
Why chosen: Useful when soil pH needs adjustment alongside rapid greenery, especially for hydrangeas and azaleas that respond to sulfur-based amendments.
Caution: Sulfur content can lower pH; test soil pH before broad application to avoid overstressing plants sensitive to acidity.
Scotts Green Max Lawn Food
Dual-Action Formula: Lawn fertilizer plus iron supplement provides a 2-in-1 approach for feeding and deep greening in just a few days. Best for fast visual results on any grass type.
Why chosen: The 5% iron content accelerates greening, helping achieve noticeable color quickly without complex applications.
Caution: Iron can stain driveways or sidewalks if overapplied; follow precise split applications to minimize runoff.
Lawn Synergy 21-0-0 Ammonium Sulfate Fertilizer
Fast-Acting Nitrogen for Lush Green Lawn: Quick growth and deep green color with added soil health benefits from sulfur. Best for quick on-lawn results in days of application.
Why chosen: Enhanced soil health helps roots establish faster, supporting dense turf after green-up periods.
Caution: As with other high-nitrogen products, avoid applying during drought or heat stress to prevent burn or stress on the lawn.
Supply Solutions Ammonium Sulfate Fertilizer 21-0-0 +24% Sulfur
Deep Green Growth with Sulfur: Designed to promote dark green foliage and colorful blooms while lowering pH in alkaline soils. Best for acid-loving plant families and florals.
Why chosen: Tailored for acid-loving species such as blueberries or hydrangeas alongside lawn use, enabling broader garden health improvements.
Caution: Sulfur levels can alter soil chemistry; monitor soil pH and adjust application accordingly to protect non-target plants.
Buying Guide
What should I consider when choosing an ammonium-based lawn fertilizer?
Consider nitrogen content, release rate, and soil pH effects. Higher nitrogen gives faster greening, but may require more frequent applications. If your soil is alkaline, a product with sulfur can lower pH and improve nutrient availability for certain plants.
Is sulfur content important for my lawn?
Yes if your soil is alkaline or you grow acid-loving plants. Sulfur-rich formulas can help lower soil pH over time and enhance nutrient uptake for species like hydrangeas, azaleas, and blueberries. Avoid excessive sulfur on already acidic soils unless you intend to adjust pH purposefully.
How do I apply these products safely and effectively?
Follow label directions for rates and timing. Use a broadcast or drop spreader for even coverage. Water after application if recommended to help nitrogen move into the root zone. Avoid application during extreme heat or drought to minimize leaf burn and turf stress.
What type of buyer should consider these products?
Homeowners requiring a quick lawn green-up, landscapers seeking uniform turf color, and gardeners needing soil pH adjustment for acid-loving plants will find these products suitable. If you need a simple, one-step solution, products with iron or balanced NPK may offer faster visible results with simpler usage.
How should I compare these options side-by-side?
Compare nitrogen percentage, sulfur content, pH effects, application timing, and the presence of iron or micronutrients. A higher nitrogen level with sulfur may yield faster green-up and soil adjustments, while iron-enhanced formulas provide quicker visual greening without altering soil chemistry dramatically.
FAQ
- What is the primary purpose of these fertilizers? – To supply nitrogen for rapid green growth and, in some cases, sulfur to support soil health and pH adjustments.
- Can I mix these products with other lawn treatments? – It depends on the product and other chemicals. Always follow label instructions and avoid incompatible mixes.
- Will these fertilizers burn my lawn? – Yes, if applied in excess or under heat stress. Always apply at the recommended rate and water as advised.
- Do these products improve soil health beyond greening? – Some formulas include sulfur and additional nutrients that support soil health and pH balance, benefiting root development over time.
- Which product works fastest for a new lawn? – Products with high immediate nitrogen content, especially when applied under ideal moisture conditions, typically show quicker greening.
- Should I test my soil before applying? – Yes. A soil test helps determine pH and nutrient needs, guiding the best product choice and application rate.