Gypsum
- Regular Price
- $ 19.99
- Sale Price
- $ 19.99
- Regular Price
- $ 18.99
- Unit Price
- per
High-Quality Gypsum (Calcium Sulfate)
Transform your soil with our premium gypsum, a versatile mineral compound essential for agriculture and gardening. Mined from top-grade sources and meticulously processed, our gypsum delivers consistent quality for improving soil structure, reclaiming sodic soils, and providing crucial calcium (23%) and sulfur (18%) nutrients—all without changing soil pH.
When to Expect Results
Improved drainage begins
Clay begins loosening
Deeper root growth
Sodic soil reclamation
FEATURES
- pH Neutral: Adds calcium without changing soil pH—unlike lime, safe for any soil type
- Dual Nutrients: Provides 23% calcium for cell walls and 18% sulfur for protein synthesis
- Clay Breaker: Flocculates clay particles to improve drainage, aeration, and root penetration
- Sodium Displacer: Replaces excess sodium in sodic soils, restoring fertility and structure
- Immediate Availability: Calcium and sulfur are water-soluble and plant-available immediately
- Year-Round Application: Safe to apply any time—no risk of burning plants
DERIVED FROM
Mined Gypsum (Calcium Sulfate Dihydrate - CaSO₄·2H₂O)
Natural mineral gypsum containing approximately 23% calcium and 18% sulfur, mined from high-purity deposits and processed to agricultural specifications. This is the same mineral used for centuries to improve soil structure and crop production.
PERFECT FOR THESE APPLICATIONS
COMMON PROBLEMS? WE HAVE SOLUTIONS
WHY GROWERS CHOOSE GYPSUM
🎯 pH-Safe Calcium
Unlike lime, gypsum adds calcium without raising pH—perfect for alkaline soils or when you need calcium but not pH change.
💧 Improved Drainage
Flocculates clay particles, creating pore space for water and air movement. See results in weeks, not years.
🧂 Sodium Fighter
The go-to solution for sodic and saline-sodic soils. Calcium ions replace sodium, which can then be leached away.
🌱 Root Zone Health
Reduces aluminum toxicity in subsoil, allowing roots to grow deeper and access more water and nutrients.
APPLICATION RATES & DIRECTIONS
🌱 Soil Amendment Applications
| Soil Type | Application Rate | Purpose | Frequency |
|---|---|---|---|
| Heavy Clay Soils | 1-2 tons/acre (40-80 lbs/1000 sq ft) | Improve structure & drainage | Annual or biennial |
| Sodic Soils (High Sodium) | 2-4 tons/acre (80-160 lbs/1000 sq ft) | Sodium displacement | As needed per soil test |
| Compacted Soils | 1-1.5 tons/acre (40-60 lbs/1000 sq ft) | Improve infiltration | Annual |
| General Maintenance | 0.5-1 ton/acre (20-40 lbs/1000 sq ft) | Maintain soil quality | Every 2-3 years |
🌾 Crop-Specific Applications
| Crop Type | Application Rate | Timing | Special Notes |
|---|---|---|---|
| Peanuts | 600-1000 lbs/acre | At pegging | Critical for pod development |
| Alfalfa | 1-2 tons/acre | Pre-plant or early spring | High sulfur demand |
| Corn | 200-500 lbs/acre | Pre-plant | Band or broadcast |
| Tomatoes | 1000-1500 lbs/acre | Pre-plant | Prevents blossom end rot |
| Citrus | 2-4 tons/acre | Spring/Fall | Improves fruit quality |
🏡 Garden & Lawn Applications
| Application | Rate | Method |
|---|---|---|
| Lawn (Clay Soil) | 40 lbs/1000 sq ft | Broadcast, water in |
| Vegetable Garden | 2-4 lbs/100 sq ft | Work into top 6 inches |
| Flower Beds | 1-2 lbs/100 sq ft | Top dress or incorporate |
| Potted Plants | 1-2 tbsp/gallon of soil | Mix into potting soil |
GYPSUM CALCULATOR
COMPARE CALCIUM SOURCES
| Feature | Gypsum | Calcium Nitrate | Bone Meal | Cal-Mag Plus |
|---|---|---|---|---|
| Calcium Content | 23% | 19% | 24% | 5% |
| Effect on pH | Neutral ✓ | Slightly raises | Neutral | Neutral |
| Organic | Yes ✓ | No (Synthetic) | Yes ✓ | No (Synthetic) |
| Additional Nutrients | 18% Sulfur | 15.5% Nitrogen | 12% Phosphorus | 3% Magnesium |
| Best For | Soil structure, sodic soils | Fast calcium + nitrogen | Organic gardens, phosphorus | Hydroponics, container |
| Breaks Up Clay | Yes ✓ | No | No | No |
| Displaces Sodium | Yes ✓ | No | No | No |
PAIRS WELL WITH
Complete your soil health program with these complementary products
Tomato Fertilizer 4-18-38
High-potassium formula for fruit production. Gypsum prevents blossom end rot while this feeds your plants.
EssentialEpsom Salt (Magnesium Sulfate)
Add magnesium to complement gypsum's calcium. Both provide sulfur for complete nutrition.
MicronutrientChelated Iron DTPA 11%
Correct iron chlorosis in alkaline soils. Works great alongside gypsum's pH-neutral calcium.
GROW WITH CONFIDENCE
Product Quality Guaranteed
- All products manufactured and packaged in California, USA
- Tested by independent third-party laboratories for quality assurance
- Registered with the California Department of Food and Agriculture (CDFA)
- Rigorously tested to ensure products are free from heavy metals
Environmental Responsibility
- Responsibly mined from natural deposits
- Minimal processing to reduce energy consumption
- Helps reduce agricultural runoff and erosion
- Improves water infiltration and conservation
- Supports sustainable soil management practices
Hassle-Free Return Policy
If you're not completely satisfied, we offer a 90-day money-back guarantee. Simply return the unused portion in its original packaging, and we'll process a full refund.
Charitable Contributions
1% of all profits go to our foundation, focused on improving educational opportunities for children. Learn more at greenway.foundation.
FREQUENTLY ASKED QUESTIONS
Q How often should I apply gypsum?
Typically once a year for maintenance or as recommended by a soil test. Heavy clay soils may benefit from annual applications, while sandy soils may only need gypsum every 2-3 years. For sodic soil reclamation, multiple applications may be needed based on the severity of sodium issues.
Q Will gypsum change my soil pH?
No, gypsum is pH neutral. Unlike lime (calcium carbonate), gypsum (calcium sulfate) adds calcium without raising soil pH. This makes it ideal when you need calcium but don't want to change pH, or for high-pH soils where lime would be detrimental.
Q Is gypsum safe for organic gardens?
Yes, mined gypsum is generally approved for use in organic farming. It's a natural mineral that doesn't contain synthetic additives. However, always verify with your specific certifying agency to ensure compliance with your organic certification requirements.
Q How quickly does gypsum work?
Gypsum begins working immediately upon application, but visible results vary. For improving water infiltration, you may see results within weeks. For sodic soil reclamation, it typically takes 3-6 months to see significant improvement. Full benefits for soil structure may take 1-2 years of regular application.
Q Can I apply gypsum with other fertilizers?
Yes, gypsum is compatible with most fertilizers and can be applied simultaneously. It won't react negatively with NPK fertilizers, organic amendments, or most pesticides. In fact, the calcium from gypsum can improve the uptake of other nutrients.
Q What's the difference between gypsum and lime?
Both provide calcium, but lime (calcium carbonate) raises soil pH while gypsum (calcium sulfate) does not. Use lime when you need to raise pH AND add calcium. Use gypsum when you need calcium without pH change, or when your soil is already alkaline.
DISCOVER MORE GARDEN WISDOM
HAVE QUESTIONS?
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