• 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

• 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

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.

1% of all profits go to our foundation, focused on improving educational opportunities for children. Learn more at greenway.foundation.

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.

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.

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.

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.

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.

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.