For fast-acting nitrogen with added sulfur, ammonium sulfate 21-0-0-24 fertilizers deliver a quick green-up and stronger plant growth. This guide highlights five readily available options that suit different lawn sizes and garden needs. It targets homeowners seeking rapid color, soil acidity adjustment, and broad plant compatibility. Read on to compare product types, application suitability, and practical considerations before you buy.
| Product | Best For | Size | Notes |
|---|---|---|---|
| Dark Matter 21-0-0 Ammonium Sulfate Fertilizer (40 lbs) | Large lawns, turf, and ornamental beds | 40 lbs | Ultra-fine prill for even coverage |
| The Grow Co Ammonium Sulfate 21-0-0 (5 lb) | Soil acidification + leafy greens | 5 lb | Acidifies alkaline soils |
| CountryMax Ammonium Sulfate 21-0-0 (10 lb) | Lawn care and mixed plantings | 10 lb | Balanced for soil and growth |
| Lawn Synergy 21-0-0 Ammonium Sulfate Fertilizer (18 lbs) – Granular | Residential lawns needing quick greening | 18 lbs | Fast-acting nitrogen with sulfur |
| Cz Garden Supply Ammonium Sulfate 21-0-0 +24% Sulfur (4 lb) | Indoor/outdoor fertilization and soil pH adjustment | 4 lb | Resealable packaging |
Dark Matter 21-0-0 Ammonium Sulfate Fertilizer
Best for: Large lawns, turf, and ornamental gardens needing a strong nitrogen push. The product claims fast green-up and growth, delivering deep green turf and vibrant garden color. It uses ultra-fine prills to promote even coverage and quick absorption, making it suitable for professional-grade spreaders and broad applications across lawns, vegetable beds, and flower borders.
Why chosen: It combines high nitrogen with practical coverage in a sizeable 40-pound bag, which suits bigger properties. The advanced prill design supports uniform application and efficient nutrient delivery.
Caution: For sensitive or newly seeded areas, apply at recommended rates to prevent potential nutrient burn. Always follow spreader settings for even distribution.
Ammonium Sulfate 21-0-0 Fertilizer — The Grow Co
Best for: Soil acidification and greener color in alkaline soils. This product emphasizes sulfur content to balance soil pH while supplying a solid nitrogen boost for robust plant growth, including leafy greens, tomatoes, and ornamentals.
Why chosen: The 21-0-0 ratio with 24% sulfur helps acid-loving plants thrive and improves nutrient uptake. It’s a practical choice when soil conditions favor a lower pH and vibrant foliage.
Caution: Avoid over-application in acidic environments where pH targets are already met; excessive sulfur can alter soil biology over time.
CountryMax Ammonium Sulfate Fertilizer 21-0-0 (10 lb)
Best for: Regular lawn care and mixed planting schemes that require a nitrogen boost with soil sulfur balance. It’s designed for both lawns and garden beds, helping sustain green color and steady growth.
Why chosen: The combination of nitrogen and sulfur supports nutrient uptake, especially in soils that benefit from additional sulfur to support plant health and soil biology.
Caution: Use appropriate rates to prevent over-fertilization, particularly in areas with dense rooting zones or clay soils that hold nutrient reserves.
CountryMax Ammonium Sulfate Fertilizer 21-0-0 (50 lb)
Best for: Larger landscape projects requiring a robust nitrogen source with soil sulfur interaction. Suitable for lawns, vegetable gardens, and general landscape maintenance.
Why chosen: A larger bag size supports frequent application over expansive areas with consistent results, aligning with routine lawn care schedules and garden feeds.
Caution: Store properly to maintain product integrity; moisture exposure can affect prill quality and spreadability.
Lawn Synergy 21-0-0 Ammonium Sulfate Fertilizer (18 lbs) — Granular
Best for: Residential lawns that need rapid greening and a quick color boost. The granular form supports straightforward ground application and even distribution in typical yard settings.
Why chosen: The 21-0-0 formulation with sulfur supports fast growth and deeper green color, beneficial for lawns that show signs of pale color or slow growth. It’s a solid mid-size option when a full 40-pound bag is not needed.
Caution: Avoid application on windy days to minimize drift into non-target areas; follow package directions for safety and effectiveness.
Ammonium Sulfate 21-0-0 + 24% Sulfur — Cz Garden Supply
Best for: Indoor and outdoor plant food that requires both nitrogen and soil acidity adjustment. It suits acid-loving plants and general garden use with a resealable packaging advantage.
Why chosen: The product emphasizes premium quality ingredients and easy storage, with a 21% nitrogen and 24% sulfur blend designed to support green growth and robust plant health.
Caution: Resealable packaging helps maintain freshness, but reseal promptly after use to prevent moisture exposure.
Buying Guide
What should I consider when buying ammonium sulfate 21-0-0 fertilizers?
- Soil pH goals: If your soil is alkaline, ammonium sulfate helps acidify the soil and improve nutrient uptake for acid-loving plants.
- Plant and lawn needs: Choose higher sulfur content or larger bag sizes based on total area and plant types, from large turf to vegetable beds.
- Application method: Consider whether you prefer granular coverage with a spreader or soluble forms for irrigation or foliar use.
- Storage and packaging: Resealable bags and moisture protection extend product life and ease of handling.
- Environmental considerations: Apply on calm days to reduce drift and avoid applying near water sources or pollinator-friendly zones.
- Safety and usage: Follow label directions for rates, timing, and compatibility with other lawn care products to prevent nutrient burn or chemical interactions.
FAQ
- What is ammonium sulfate used for in lawns?
It provides nitrogen for rapid growth and sulfur for soil health, which can enhance green color and nutrient uptake, especially in alkaline soils.
- Can ammonium sulfate lower soil pH quickly?
Yes, ammonium sulfate can gradually lower soil pH, but the rate depends on soil type and existing pH; expect gradual changes with repeated applications.
- Is ammonium sulfate safe for vegetables?
Yes, it can benefit many vegetables when applied according to label directions, particularly in soils needing sulfur or nitrogen supplementation.
- Should I water in ammonium sulfate after application?
Watering after application helps dissolve granules and improves nutrient availability, unless the product specifies otherwise.
- What is the difference between granular and sprayable ammonium sulfate?
Granular formulations are spread on the soil, while sprayable forms are dissolved in water for irrigation or foliar use; choose based on your application method.
- How often should I apply ammonium sulfate?
Follow product-specific guidelines; typical programs align with seasonal lawn and garden feeding schedules to maintain color and growth.