Greenway Biotech Ammonium Sulfate 21-0-0 Fertilizer — 5 lb Water‑Soluble, 21% N & 24% S for Acid‑Loving Plants

Greenway Biotech Ammonium Sulfate 21-0-0 is a water‑soluble fertilizer that supplies fast‑acting ammonium nitrogen plus sulfur to promote green, vigorous growth and gently lower alkaline soil pH for acid‑loving plants.

This granular, 100% water‑soluble formula contains 21% nitrogen (as ammonium) and 24% sulfur, designed for gardeners and landscapers who need a quick nutrient boost and mild soil acidification. It dissolves cleanly for soil drenches, fertigation, or controlled foliar applications and is produced and third‑party tested in the USA under CDFA registration. The product is versatile for lawns, blueberries, azaleas, rhododendrons, container plants and vegetable gardens when used according to label directions.

How quickly will I see results after applying this ammonium sulfate?

Because the nitrogen is in ammonium form and the product is fully water‑soluble, many users observe visible greening within one to two weeks when the fertilizer is applied and watered in. Sulfur works more gradually by reacting with soil and influencing pH over multiple feedings.

• Fast nitrogen uptake when dissolved and watered into the root zone
• Visual leaf color improvements commonly seen in 7–10 days with proper application
• Sulfur provides slower soil acidification across several applications
• Dissolves completely—no residue to clog spray equipment if mixed correctly

Can I use this on blueberries, azaleas and other acid‑loving plants?

Yes. The 24% sulfur content helps lower alkaline soils over time, creating a more favorable root environment for plants that prefer pH in the 4.5–6.0 range. Regular, measured applications give the best balance between nitrogen supply and gradual pH adjustment.

• Recommended for blueberries, azaleas, rhododendrons, camellias and similar species
• Balances leafy growth with sulfur to support chlorophyll and enzyme processes
• Apply per label rates and monitor soil pH to avoid over‑acidification
• Useful in potting mixes and containers with limited buffering capacity

What are the safest ways to apply this fertilizer around edible crops?

The product is lab tested for low heavy metals and meets strict CDFA standards, making it suitable for vegetable gardens and fruit trees when applied according to instructions. Use precise measurements, dissolve thoroughly for soil drenching, and irrigate after application to move nutrients into the root zone.

• Third‑party testing and CDFA registration for heavy metal safety
• Dissolve for fertigation or soil drench to avoid uneven distribution
• Follow label rates and water in after application to reduce foliar contact
• Store dry and sealed to maintain shelf life and effectiveness

How do I use this product on lawns, containers and trees?

This fertilizer is designed for flexible application methods: broadcast to turf at recommended rates, dissolve for container drenches, or blend into topsoil for larger plantings. Always calibrate spreaders or mixing equipment and follow the included application chart to match the needs of each plant type.

• Use broadcast application with accurate spreader settings for lawns
• Dissolve in water for containers, fertigation or foliar feeds (if label permits)
• Topdress or incorporate lightly into soil for trees and shrubs
• Keep to label‑specified rates to avoid nutrient burn or over‑acidification

Who this product is for: Greenway Biotech Ammonium Sulfate 21‑0‑0 is intended for home gardeners, small‑scale farmers and professional landscapers who want a reliable, water‑soluble nitrogen source paired with sulfur for pH management. It's a practical choice when you need quick greening for turf or targeted nutrition for acid‑loving ornamentals and edible gardens, provided you follow the clear, safe application guidelines.