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Item Number: F2263

Organic Sulfur 90% (Granular) 50 lbs

Use To Lower Soil pH & Supply Sulfur

Organic Sulfur 90% is a concentrated elemental sulfur amendment formulated with bentonite clay for fast, dependable soil pH correction and long-term soil health. Dust-free granules are easy to spread; when they absorb moisture, the bentonite swells and breaks apart, releasing fine sulfur evenly through the soil profile for consistent performance across beds and production fields.

  • Form: Granular elemental sulfur blended with bentonite clay
  • Analysis: 90% S (elemental)
  • Behavior: Moisture-activated; granules swell and disperse for uniform soil coverage
  • Bag Size: 50 lb
  • Primary Use: Lowering soil pH (acidifying) and supplying plant-available sulfur
  • Best For: Alkaline soils; acid-loving crops and ornamentals
  • Application: Broadcast, banded, or incorporated into soil

Why Growers Use It

Sulfur is more than a soil acidifier—it is an essential plant nutrient involved in protein synthesis and enzyme activation. By lowering pH more quickly than other amendments, this formulation improves availability of phosphorus, iron, and key micronutrients already present in the soil. It also enhances nitrogen efficiency, helping gardeners and farmers get more value from existing fertility programs and supporting vigorous growth, robust root development, and high-quality harvests.

Performance & Crop Suitability

  • Fast, reliable pH correction for alkaline soils in gardens and production acreage
  • Even dispersion of fine sulfur after wetting ensures consistent results across beds and rows
  • Ideal for acid-loving crops and ornamentals such as Vaccinium corymbosum (blueberries), Vitis vinifera (grapes), and Rhododendron spp.
  • Supports soil biology and nutrient cycling for long-term soil health and plant care
  • Durable, dust-free granules for easy handling and precise field applications

Application Guidelines

  • Always soil test to determine proper rates.
  • Typical rates: 1–5 lb per 100 sq ft (garden beds) or 200–2000 lb per acre (field use), depending on soil pH, texture, and target crop.
  • A little sulfur can stimulate soil micro-life; over-application may be harmful, and some plants are sulfur-sensitive—apply with care.

Sustainable Growing

This moisture-activated, granular elemental sulfur provides a natural, long-lasting amendment that aligns with organic and sustainable growing practices. Unlike mined sulfur sources, the bentonite-enhanced granule delivers consistent performance and reliable application, helping you balance fertility, manage pH, and improve overall field performance.

Learn more about plant nutrition in our article on Macro and Micro Nutrients, or explore complementary Fertilizer & Growing Supplies to support garden and farm productivity.

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Quantity Discounts for Organic Sulfur 90% (Granular) 50 lbs
Buy 10 for $28.79 each
Buy 40 for $27.19 each
$31.99
Discount applied. Offer ends soon.
Next-day shipping available

Check Your Zone Compatibility:

Shipping Information

Ships from Northern CA.

Does not qualify for Flat Rate Shipping.

Shipping Weight: 51.0 lb

Dimensions: 21.5"L x 15.5"W x 5.5"H

Features

    Characteristics

    Organic Status: Certified Organic Product
    Animal-Based : No
    Fertilizer Type : Powdered/Granulated/Meal
    Major Nutrients : Sulfur
    Nutrient Release Rate : Short-term (1-4 Months)
    pH Adjusting : Corrects High pH
    Use as Foliar : No
    Organic Certifier: OMRI

    Use Instructions

    Useful Information

    Guarantee

    View full details

    Customer Reviews

    Based on 2 reviews
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    J
    JR
    Compressed Pellets are easy to handle; very low dust

    This is my first time using elemental sulfur. There are no instructions on the bag, which may be standard.

    I wanted to share my calculations for anyone like me who struggles with the calculations and ratios and is doing a small area or container. It took me a long time to calculate this. Hopefully I am not wrong. 🤞🏻 I won't be offended if you check my math. 😅

    The California Master Gardener Handbook (2nd ed, page 79) recommends 2-4 pounds per 100 sq ft. So to shrink those same ratios for a smaller space...

    PER 1 SQUARE FOOT:
    Mixed into every 6-8 inches of depth in the soil...

    - 75% strength: 14 grams of sulfur
    - 87.5% strength: 16.6 grams of sulfur 
    - 100% strength (4 pounds sulfur per 100 sq ft): 18 grams of sulfur

    Tip: I took my kitchen scale out to the garden in a clear plastic bag (to keep it clean) and measured the grams out into a mixing cup as I was blending soil.

    R
    Rod
    Highly Satisfied

    I am very impressed with the customer service and fast delivery of the Tiger Soil Sulfur. The product its self was well packaged and , thus far, dust free. I am close to the bottom of the bag but not there yet to see if there is any dust there. As for the products effectiveness we will have to wait to see, as it takes the sulfur months to change the PH of the soil. Check back with me in the Fall.