Pure organic elemental sulfur powder for natural soil pH correction, eco-friendly pest control, and essential plant nutrition. Professional-grade quality trusted by commercial growers and home gardeners alike.
Pure elemental sulfur (S) approved for organic gardening and agriculture. No synthetic additives, fillers, or chemical processing agents.
Safely lowers soil pH for acid-loving plants like blueberries, azaleas, rhododendrons, and camellias. Works gradually through natural soil biology.
Creates an effective perimeter barrier that naturally deters snakes without toxic chemicals. A time-tested approach used by homeowners and landscapers.
Repels chiggers, fleas, ticks, and various garden insects without synthetic pesticides. Safe for beneficial pollinators like bees when applied properly.
Sulfur is the fourth most important plant nutrient, crucial for protein synthesis, enzyme formation, chlorophyll production, and vitamin metabolism.
Soil bacteria convert elemental sulfur gradually over 3–6 months, providing long-lasting pH adjustment without the risk of sudden soil chemistry changes.
Fine particle size for faster soil conversion and more uniform application. Used by commercial growers, landscapers, and serious home gardeners.
Suitable for soil amendment, pest control, fungicide applications, and outdoor perimeter treatment. One product for multiple garden and property needs.
Independently lab tested for heavy metal content. Registered with the California Department of Food and Agriculture (CDFA) for quality assurance.
Generally safe around pets and wildlife once watered into soil. A naturally occurring element with lower toxicity than many synthetic pest control alternatives.
Our organic elemental sulfur is sourced from high-purity natural deposits, meeting strict organic gardening standards and environmental requirements.
Naturally occurring element (S) with atomic number 16. Essential for all living organisms, found in volcanic deposits and recovered as a byproduct of petroleum refining. Our sulfur meets organic certification standards.
Elemental sulfur doesn't directly lower soil pH. Instead, naturally occurring soil bacteria (primarily Thiobacillus species) oxidize elemental sulfur into sulfuric acid, which then reacts with soil to lower pH. This biological process is why results take weeks rather than days — and why it's so safe and predictable. Best performance when soil temperatures are above 55°F and kept evenly moist.
Soil bacteria oxidize elemental sulfur (S⁰) into sulfate (SO₄²⁻), producing sulfuric acid as a byproduct. This natural process acidifies the surrounding soil gradually and safely.
The sulfate produced by oxidation is the form plants actually absorb. This means sulfur application simultaneously lowers pH and provides a critical plant nutrient for protein and enzyme synthesis.
Finer sulfur powder has greater surface area for bacterial colonization, resulting in faster conversion rates compared to pelletized or granular forms.
Low buffering capacity means less sulfur is needed to shift pH. Approximately 10 lbs per 1,000 sq ft lowers pH by 1 point. Changes happen faster but may not last as long.
Moderate buffering capacity. Requires about 12 lbs per 1,000 sq ft to lower pH by 1 point. The most balanced soil type for predictable sulfur performance.
High buffering capacity requires more sulfur — approximately 15 lbs per 1,000 sq ft for a 1-point pH drop. Changes are slower but tend to be more long-lasting.
Results vary with soil temperature, moisture, and microbial activity. Best performance when soil temps are above 55°F.
Always conduct a soil test before application to determine actual sulfur needs. Over-application can drop pH below target levels.
| Current pH | Target pH | Sandy Soil | Loam Soil | Clay Soil |
|---|---|---|---|---|
| 7.5 | 6.5 | 10 lbs | 12 lbs | 15 lbs |
| 7.0 | 6.0 | 10 lbs | 12 lbs | 15 lbs |
| 6.5 | 5.5 | 10 lbs | 12 lbs | 15 lbs |
| 7.5 | 5.5 | 20 lbs | 24 lbs | 30 lbs |
| Target Pest | Application Method | Rate | Frequency |
|---|---|---|---|
| Snakes | Perimeter barrier | 2–3 inch wide band | Reapply after rain |
| Chiggers | Dust application | 5 lbs / 1,000 sq ft | Every 4–6 weeks |
| Garden Insects | Light dust on plants | Light dusting | As needed |
| Fleas & Ticks (yard) | Broadcast in yard | 5 lbs / 1,000 sq ft | Every 4–6 weeks |
| Plant Type | Application Rate | Method | Timing |
|---|---|---|---|
| Blueberries | ½ cup per plant | Work into soil around base | Early spring |
| Azaleas / Rhododendrons | ¼ cup per plant | Around drip line | Spring & fall |
| Lawn (acidification) | 5–10 lbs / 1,000 sq ft | Broadcast spreader | Spring or fall |
| Hydrangeas (blue) | ¼ cup per plant | Work into soil | Early spring |
For new blueberry plantings, apply sulfur 3–6 months before planting to allow time for full pH adjustment. Work ½ cup per plant into the planting hole along with acidic compost. Blueberries thrive at pH 4.5–5.5, and pre-treating soil prevents transplant shock from alkaline conditions.
Refer to the Safety Data Sheet (SDS) for complete safety information.
Build a complete acidification and nutrition program for your acid-loving plants by pairing organic sulfur with these complementary products.
Provides iron while also lowering pH. Excellent companion for acid-loving plants showing signs of iron chlorosis (yellowing leaves).
Nitrogen fertilizer that also acidifies soil. Two benefits in one — feed and acidify simultaneously.
Complete nutrition for berries and acid-loving fruiting plants. Pair with sulfur to maintain optimal acidic soil conditions.
Adds calcium and sulfur without changing soil pH. Improves clay soil structure and drainage for better sulfur performance.
Elemental sulfur, also known as brimstone, is a naturally occurring element (S) essential for all living organisms. In organic gardening, sulfur serves multiple critical functions: it's a vital nutrient for plant growth, helping form proteins and enzymes; it naturally lowers soil pH for acid-loving plants; and it acts as an organic fungicide and pest deterrent. Unlike synthetic alternatives, elemental sulfur is approved for organic gardening and works in harmony with soil biology. For more detail, see our article on What Is the Function of Sulfur in Plants?
Elemental sulfur typically takes 2–8 weeks to begin lowering soil pH, with full effects visible within 3–6 months. The speed depends on soil temperature (works faster in warm soil above 55°F), moisture levels, particle size (finer powder works faster), and soil bacteria activity. For best results, apply sulfur in spring or fall when soil is moist and temperatures are moderate.
When used as directed, elemental sulfur is generally safe around pets and wildlife. It's a naturally occurring element that's less toxic than many synthetic alternatives. Keep pets away during application to prevent dust inhalation, water thoroughly after applying to settle the powder, and store in a secure location. Sulfur effectively repels many pests without harming beneficial insects like bees when used properly.
No — do not apply sulfur and lime together or within 2–3 weeks of each other. Sulfur lowers pH while lime raises it, so using both simultaneously will neutralize their effects and waste product. Always test soil pH before application to determine which amendment you actually need.
The amount varies by soil type. Sandy soils require approximately 10 lbs per 1,000 sq ft to lower pH by 1 point. Loam soils need about 12 lbs per 1,000 sq ft. Clay soils require the most — around 15 lbs per 1,000 sq ft. Use our calculator above for precise amounts based on your specific situation.
Pure elemental sulfur has a mild, characteristic odor that most people find faint and inoffensive. It is much less pungent than sulfur-based compounds like hydrogen sulfide (the classic "rotten egg" smell). The odor dissipates quickly once the powder is worked into the soil and watered in.
Yes — sulfur powder has been used for generations as a natural snake deterrent. Applied as a 2–3 inch wide perimeter band around homes, gardens, or outdoor living areas, it creates a barrier that snakes prefer to avoid. It requires reapplication after rain. For detailed instructions, see our guide on How to Use Organic Sulfur Powder.
Elemental sulfur applied at recommended rates is safe for most plants. However, applying excessive amounts can drop soil pH too low and damage root systems. Sulfur dust applied directly to foliage in hot weather (above 90°F) can cause leaf burn. Always follow application rate guidelines and avoid foliar application during extreme heat.
Important details on quality, returns, sustainability, and charitable efforts that set our organic products apart.
We stand behind the quality of our Organic Elemental Sulfur Powder. If you're not completely satisfied with your purchase, we offer a 90-day money-back guarantee. Simply return the unused portion in its original packaging for a full refund, no questions asked.
At Greenway Biotech, Inc., we believe in giving back to our community and supporting education for children. 1% of all profits from our organic product sales go to the Greenway Foundation, dedicated to helping children's education and promoting organic gardening in schools.
For more information, visit greenway.foundation.
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