For healthy, green lawns, ammonium sulfate 21-0-0 fertilizers are a popular choice to provide essential nitrogen and sulfur while helping to lower soil pH in alkaline conditions. The following picks represent top options designed for both indoor garden beds and outdoor lawns. Each product features strong nitrogen content, sulfur for acid-loving plants, and user-friendly packaging. This guide compares these ammonium sulfate fertilizers to help homeowners choose what best suits their turf and soil needs.
| Product | Brand | Key Benefit |
|---|---|---|
| The Grow Co Ammonium Sulfate 21-0-0 | The Grow Co | Deep green color, soil acidifier, rapid growth |
| Cz Garden Supply Ammonium Sulfate 21-0-0 + 24% Sulfur | Cz Garden Supply | Premium nitrogen and sulfur, resealable packaging |
| Greenway Biotech Ammonium Sulfate 21-0-0 | Greenway Biotech | Water-soluble, lowers pH for acid-loving plants |
| Lawn Synergy 21-0-0 Ammonium Sulfate Fertilizer (18lbs) | Lawn Synergy | Fast-acting nitrogen, lush green lawn |
| Dark Matter 21-0-0 Ammonium Sulfate Fertilizer | Generic | Ultra-fine prill, quick absorption, broad use |
Ammonium Sulfate 21-0-0 By The Grow Co
The Grow Co offers a 21-0-0 formula with 21% nitrogen and 24% sulfur, designed to support rapid plant growth and a deeper green color. This product also serves as a soil acidifier, helping to lower pH levels in alkaline soils and improve nutrient uptake for acid-loving plants. The combination of nitrogen for growth and sulfur for health supports a vibrant lawn and garden. The 5 lb bag is convenient for hobbyists with smaller lawns or for targeted spot treatments.
Ideal for turf and ornamental plants, this fertilizer emphasizes soil health and a rich green hue. Its granular composition aims for even distribution with a focus on improving soil biology through sulfur content. While the label highlights fast greening, results depend on consistent application and proper irrigation. Suitable for lawns in need of acidification and improved nutrient availability.
Ammonium Sulfate Fertilizer AMS 21-0-0 +24% Sulfur
This Cz Garden Supply product adds 21% nitrogen and 24% sulfur, promoting vigorous green growth while improving soil acidity for plants that prefer slightly acidic conditions. The fertilizer is designed to be water-soluble, aiding quick nutrient availability in both indoor and outdoor settings. The 4 lb resealable pouch enhances storage and portioning, making it user-friendly for regular lawn care routines.
Designers emphasize premium ingredients and a focus on green, leafy growth. The dual function of nitrogen and sulfur supports robust turf, fruit, and vegetable plants that benefit from sulfur as a secondary nutrient. The packaging is convenient for home gardeners who want to keep the product fresh between uses.
Greenway Biotech Ammonium Sulfate 21-0-0 Fertilizer
Greenway Biotech’s formulation contains 21% water-soluble nitrogen and 24% sulfur, specifically marketed to lower pH levels in alkaline soil and support acid-loving plants. Its water-soluble nature promotes easy nutrient uptake for both indoor and outdoor plants. This product is positioned as essential for lawn care and general gardening where soil pH management is a priority.
The fertilizer focuses on essential nutrients that contribute to rapid growth and a rich green color. The emphasis on pH management makes it a practical choice for homeowners dealing with lime-rich soils or those planting acid-loving species alongside their lawn.
21-0-0 Ammonium Sulfate Fertilizer (18lbs)
Lawn Synergy’s 21-0-0 ammonium sulfate fertilizer provides a quick nitrogen boost, promoting rapid greening and growth for lawns that need a fast visual improvement. The formulation includes 24% sulfur to support sulfur uptake and root development, contributing to overall plant vigor and soil health. The 18-pound bag is suitable for larger lawns or seasonal applications.
The product highlights a fast-acting nitrogen component, designed to produce a lush, dark green lawn within days of application. It aims to balance nitrogen availability with soil sulfur to optimize turf health and reduce aluminum toxicity in some acidic soils. Application guidance should consider spread rate and irrigation to maximize results.
Dark Matter Ammonium Sulfate 21-0-0 Fertilizer
Dark Matter 21-0-0 is engineered for fast green-up and growth, delivering a high-nitrogen boost for lawns, gardens, and turf. The product is marketed as versatile for cool- and warm-season grasses, as well as ornamentals and vegetables, making it a flexible option for mixed-use landscapes. The ultra-fine prill format aims for even coverage and quicker absorption when applied with a spreader.
The emphasis on rapid turf enhancement is paired with broad usability across various plant types. Users should follow spreader recommendations and ensure irrigation after application to support nutrient uptake and minimize leaf burn or fertilizer runoff.
Hi-Yield Ammonium Sulfate 21-0-0 (4 lbs.)
Hi-Yield’s 21-0-0 ammonium sulfate product emphasizes nitrogen for deep green color and rapid growth, suitable for lawns, trees, shrubs, flowers, and vegetables. The inclusion of sulfur helps acidify high-alkaline soils, supporting nutrient availability for plants that prefer lower pH. This option is available in a 4-pound size, appealing to homeowners with smaller applications or spot treatments.
The formulation focuses on rapid greening while addressing soil pH considerations. It can be used on a range of landscape plants, but users should calibrate application rates with equipment and irrigation to prevent potential fertilizer burn, especially in dry conditions.
Ammonium Sulfate (NH4) 21% N, 24% S
Alpha Chemicals offers a fine-grained ammonium sulfate with 21% nitrogen and 24% sulfur content. This product highlights its fine crystals ideal for precise distribution and quick solubility, making it suitable for both lawn care and garden applications. The compact packaging supports smaller projects or careful, incremental feeding.
As with all ammonium sulfate products, the sulfur component contributes to soil health by supporting nutrient uptake in acidic or alkaline-prone soils. Users should read label directions to determine spread rates and consider watering in after application to maximize efficiency and reduce volatilization.
Buying Guide: Key Purchase Considerations
- Soil pH and plant needs: If your lawn or plants prefer acidic conditions, ammonium sulfate is a practical choice due to its sulfur content, which helps lower pH over time. Consider a soil test to confirm whether pH adjustment is needed.
- Nitrogen and sulfur balance: Most products shown are 21-0-0 with 24% sulfur, delivering quick green-up and robust leaf development. For slow-release needs or larger lawns, review product granularity and waiting times between applications.
- Application method: Granular versus water-soluble forms affect ease of use. Granular products are typically spread with a broadcast spreader, while water-soluble options may be dissolved in irrigation systems or applied as a solution.
- Packaging and storage: Resealable pouches help maintain product freshness, especially for smaller yards or infrequent use. For larger loads, sturdy bags and proper sealing are important to prevent caking and moisture damage.
- Size and coverage: Match bag size to your lawn area. Larger bags may offer better value for expansive lawns but require appropriate storage space and handling.
- Safety and handling: Wear gloves and follow label directions when applying fertilizers. Avoid direct contact with skin and eyes, and rinse thoroughly after handling.
- Multi-plant compatibility: If you care for a mixed landscape (lawn plus shrubs, blueberries, or ornamentals), ensure the product’s sulfur level supports both lawn health and soil pH needs without harming sensitive plants.
- Price and availability: Compare per-pound cost and consider bulk options if you maintain a large lawn. Check current stock and prime shipping options for timely delivery.