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Organic Gypsum Powder 10LB - Made in USA - Calcium Sulfate Dihydrate - Garden Soil Amendment Fertilizer for Lawns, Plants, Mushroom Cultivation. Calcium & Sulfur. Cures Blossom End Rot. OMRI Listed

4.8 out of 5 stars 365 ratings
$29.99 $0.19 per Ounce
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Color: Cz Garden Organics Gypsum 10LB
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Purchase options and add-ons

Brand Cz Garden Supply
Item Weight 10 Pounds
Item Form Powder
Coverage Resealable
Specific Uses For Product Plant Growth, Soil Conditioning, Mushroom

About this item

  • OMRI Listed - Cz Gypsum Calcium Sulfate Dihydrate is an All-Natural mineral fertilizer listed by the Organic Materials Review Institute (OMRI). It may be used in certified organic production or food processing and handling according to the USDA National Organic Program regulations.
  • Supplies essential nutrients calcium and sulfur to improve plant growth and maximize fertilizer performance.
  • Loosens compacted soil to allow water to penetrate soil faster.
  • pH Neutral. Cures Blossom End Rot Perfect for Tomatoes, Roses, and other container garden plants!
  • Mushroom Cultivation - helps to improve the structure and water-holding capacity of the substrate, neutralizes excess acidity and provides essential calcium
  • RESEALABLE, EASY POUR PACKAGING: Cz Garden Dolomitic Lime is professionally packaged in a 10 LB Heavy Duty resealable pouch designed for long term storage. Pour the necessary quantity with ease and store the rest for future use.
  • COUNTRY OF ORIGIN: USA - Cz Garden fertilizers and soil amendments are manufactured in the USA from the highest quality ingredients. Buy with confidence!
  • Cz Garden Organics is committed to developing Premium Grade custom soil amendment blends, fertilizers, and nutrients for your organic garden.
› See more product details

Additional Details

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Frequently bought together

Organic Gypsum Powder 10LB - Made in USA - Calcium Sulfate Dihydrate - Garden Soil Amendment Fertilizer for Lawns, Plants, Mu
This item: Organic Gypsum Powder 10LB - Made in USA - Calcium Sulfate Dihydrate - Garden Soil Amendment Fertilizer for Lawns, Plants, Mushroom Cultivation. Calcium & Sulfur. Cures Blossom End Rot. OMRI Listed
$29.99 ($0.19/Ounce)
Get it as soon as Wednesday, Apr 16
Sold by Cz Garden and ships from Amazon Fulfillment.
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Organic Dolomite Lime 10LB - Made in USA - Garden Soil Amendment Fertilizer for Plants. Calcium/Magnesium Additive. Raise & S
$29.99 ($0.19/Ounce)
Get it as soon as Thursday, Apr 10
In Stock
Sold by Cz Garden and ships from Amazon Fulfillment.
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Kelp Meal Fertilizer (10lbs) - Organic Kelp Fertilizer for Plants, Garden Soil, Flowers, Vegetables, & Lawns - Organic Plant
$44.99 ($0.28/Ounce)
Get it as soon as Thursday, Apr 10
In Stock
Sold by Plantonix and ships from Amazon Fulfillment.
Total price: $00
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Product details

  • Package Dimensions ‏ : ‎ 15.55 x 12.64 x 5.71 inches; 10 Pounds
  • Item model number ‏ : ‎ CzGYPpdr
  • Date First Available ‏ : ‎ February 25, 2024
  • Manufacturer ‏ : ‎ Cz Garden
  • ASIN ‏ : ‎ B0CWFKJLHY
  • Country of Origin ‏ : ‎ USA
  • Customer Reviews:
    4.8 out of 5 stars 365 ratings

Important information

Directions

1. Apply the Organic Gypsum Powder to the soil. 2. Water the soil to allow the product to penetrate and loosen the soil. 3. Use the product to supply essential nutrients calcium and sulfur to improve plant growth and maximize fertilizer performance.

Product Description

Gypsum Bags

  • OMRI Listed - Cz Gypsum Calcium Sulfate Dihydrate is an All-Natural mineral fertilizer listed by the Organic Materials Review Institute (OMRI). It may be used in certified organic production or food processing and handling according to the USDA National Organic Program regulations. (OMRI Certified 2023)
  • Supplies essential nutrients calcium and sulfur to improve plant growth and maximize fertilizer performance.
  • pH Neutral. Cures Blossom End Rot Perfect for Tomatoes, Roses, and other container garden plants!
  • Repairs soil from Pet Damage and Road Salt
  • Loosens compacted soil to allow water to penetrate soil faster.
  • Mushroom Cultivation - helps to improve the structure and water-holding capacity of the substrate, neutralizes excess acidity and provides essential calcium
  • Cz Garden Organics is committed to developing Premium Grade custom soil amendment blends, fertilizers, and nutrients for your organic garden.

Gypsum Roots Comparison

Reduces Soil Compaction

  • Gypsum helps loosen compacted heavy clay soils and improve soil structure.
  • Allows nutrients to penetrate deep into the soil.
  • Improves Aeration & Drainage

gypsum blossom rot

Cures Blossom End Rot

  • Prevents and Cures Blossom End Rot in Tomatoes and Peppers!

pet damage

Repairs Soil from Pet Damage

  • Repairs Soil from Pet Damage and Road Salt

Gypsum Tomato
Gypsum Uses
Mushroom Cultivation

Mushroom Cultivation

Mushroom Cultivation - helps to improve the structure and water-holding capacity of the substrate, neutralizes excess acidity and provides essential calcium

Gypsum Mushroom Woman
Gypsum OMRI

OMRI Certified 2023

Customer reviews

4.8 out of 5 stars
365 global ratings

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Customers say

Customers find the gypsum powder effective at preventing blossom end rot, particularly on tomatoes. The product receives positive feedback for its quality and ease of application.

AI-generated from the text of customer reviews

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10 customers mention "Nutrients"8 positive2 negative

Customers find that the fertilizer works well as a nutrient source, with one customer specifically noting its effectiveness for tomatoes and another mentioning how it saved their zucchini.

"Easy to use and it provided the calcium the plants , especially tomatoes they needed." Read more

"...’s soooo much cheaper to buy at a local garden store, but this bag served its purpose and was the exact size i needed for my garden so it worked out..." Read more

"Great calcium additive for tomatoes." Read more

"Awesome...works amazing in all I have grown ." Read more

7 customers mention "Quality"7 positive0 negative

Customers find the fertilizer to be of good quality.

"What can you say about gypsum. This brand seems to be good and was shipped quickly and packaged well. I use it to add calcium to my raised beds...." Read more

"Awesome...works amazing in all I have grown ." Read more

"Good product..." Read more

"Good product..." Read more

7 customers mention "Rot prevention"7 positive0 negative

Customers report that the gypsum powder effectively prevents blossom end rot on tomatoes.

"...(don't sprinkle on the leaves) and they grow great with not end rot of the fruit. Mix in with potted plant soil...." Read more

"Helped my tomatoes get rid of bottom end rot!" Read more

"...Stopped blossom end rot on my peppers, tomatoes, and zucchinis; however, next year I’ll be buying a big bag from my garden store for a quarter of..." Read more

"This product saved my zucchini and eliminated the blossom rot we experienced early in the season. This will be a staple in my gardening shed!!" Read more

4 customers mention "Ease of application"4 positive0 negative

Customers find the fertilizer easy to apply.

"Easy to use and it provided the calcium the plants , especially tomatoes they needed." Read more

"Easy to use" Read more

"Easy application..." Read more

"No instruction..." Read more

Works for bottom end rot on tomatoes!
5 out of 5 stars
Works for bottom end rot on tomatoes!
I landed on this product for it's claim regarding bottom end rot, and after researching what appears to be a lack of calcium in the soil. The issue wasn't in my garden (though I now have enough to treat my garden for years to come), but in a patio ready Bush Early Girl planter, that produces in 40 days, and yes I've already eaten several of them including putting the two biggest ones on a 7 layer bean salad.I initially noticed holes appearing in a few tomatoes while they were still green, I cut them off and fried them off after removing the sections in question. Once I got the correct formula for small gardening use, I applied it and got quick results. Only one more tomato got a small spot and is still growing just fine to be picked and consumed shortly.I was a little dismayed when I first got the prouct and the directions were focused on large gardens, so I sent a question off to the seller (which can be done when they're listed as the seller, but not if Amazon is), and got an immediate response with how to use.I sent my message at 6:05 PM on July 11th 2024, and got a reply back by 7:34 AM July 12th,Good Morning KellyFor soil drench, please mix 1 to 2 oz per gallon of water.Please see attached.We are awaiting new bags that will include the soil drench dosage amounts.Many thanks for your support!Cz Garden
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Top reviews from the United States

  • Timothy Eastman
    5.0 out of 5 stars Works great for adding necessary nutrients.
    Reviewed in the United States on April 6, 2023
    Color: Cz Garden Organics Gypsum 5LBVerified Purchase
    Sprinkle in the ground around tomato, pepper, etc plants (don't sprinkle on the leaves) and they grow great with not end rot of the fruit. Mix in with potted plant soil. Check soil nutrient level first and don't add to much or it will decrease the potassium and magnesium levels in the soil.

    Also, although natural Gypsum is an inorganic compound, it is natural (no chemicals added) and therefore is acceptable in the Organic Materials Review Institute (OMRI) handbook and can be labeled as "organic" because it's mined straight from the ground as is. Another "organic" alternative to Gypsum is epsom salt (compare price per pound.)
    11 people found this helpful
    Helpful
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  • ekimrednif
    5.0 out of 5 stars Shipped quickly and packaged well
    Reviewed in the United States on March 3, 2025
    Color: Cz Garden Organics Gypsum 5LBVerified Purchase
    What can you say about gypsum. This brand seems to be good and was shipped quickly and packaged well. I use it to add calcium to my raised beds. I was told that gypsum will provide calcium without raising the PH level as lime will do.
    I have a hard time keeping my PH below 7 but do have a problem with blossom end rot on my tomatoes, so I need calcium, but don't want to lower the PH.
    One person found this helpful
    Helpful
     Report
  • Siegfried N. Lodwig
    5.0 out of 5 stars Exactly what I ordered
    Reviewed in the United States on January 30, 2025
    Color: Cz Garden Organics Gypsum 5LBVerified Purchase
    I grow plants in synthetic soil. I need a time release source of sulfur for my plants. The calcium part is necessary for my epiphytic soil mixture. I can't add calcium carbonate to this soil because epiphytes can't tolerate the higher pH that using calcium carbonate generates. My epiphytes get the calcium that they need from the tap water I use, acidified with about a tablespoon per gallon of (cheap) vinegar. This 5 lb bag of powdered gypsum (calcium sulfate) will last me for ten lifetimes, even though I'm a nut case plant hobbyist. I have more than a thousand potted plants. I use a tablespoon powdered gypsum in a three gallon Cornell University type of soil mix. I'll probably start using it up in my garden. It's a great source of sulfate for those plants. An aside - note the stupid use of the word "organic" in the ad for this gypsum. The Great American con job re "organic" continues to add cost without value. For the record, gypsum is about as "inorganic" as it gets.
    Helpful
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  • Kelly E.
    5.0 out of 5 stars Works for bottom end rot on tomatoes!
    Reviewed in the United States on July 28, 2024
    Color: Cz Garden Organics Gypsum 5LBVerified Purchase
    I landed on this product for it's claim regarding bottom end rot, and after researching what appears to be a lack of calcium in the soil. The issue wasn't in my garden (though I now have enough to treat my garden for years to come), but in a patio ready Bush Early Girl planter, that produces in 40 days, and yes I've already eaten several of them including putting the two biggest ones on a 7 layer bean salad.

    I initially noticed holes appearing in a few tomatoes while they were still green, I cut them off and fried them off after removing the sections in question. Once I got the correct formula for small gardening use, I applied it and got quick results. Only one more tomato got a small spot and is still growing just fine to be picked and consumed shortly.

    I was a little dismayed when I first got the prouct and the directions were focused on large gardens, so I sent a question off to the seller (which can be done when they're listed as the seller, but not if Amazon is), and got an immediate response with how to use.

    I sent my message at 6:05 PM on July 11th 2024, and got a reply back by 7:34 AM July 12th,
    Good Morning Kelly
    For soil drench, please mix 1 to 2 oz per gallon of water.
    Please see attached.
    We are awaiting new bags that will include the soil drench dosage amounts.
    Many thanks for your support!
    Cz Garden
    Customer image
    Kelly E.
    5.0 out of 5 stars
    Works for bottom end rot on tomatoes!

    Reviewed in the United States on July 28, 2024
    I landed on this product for it's claim regarding bottom end rot, and after researching what appears to be a lack of calcium in the soil. The issue wasn't in my garden (though I now have enough to treat my garden for years to come), but in a patio ready Bush Early Girl planter, that produces in 40 days, and yes I've already eaten several of them including putting the two biggest ones on a 7 layer bean salad.

    I initially noticed holes appearing in a few tomatoes while they were still green, I cut them off and fried them off after removing the sections in question. Once I got the correct formula for small gardening use, I applied it and got quick results. Only one more tomato got a small spot and is still growing just fine to be picked and consumed shortly.

    I was a little dismayed when I first got the prouct and the directions were focused on large gardens, so I sent a question off to the seller (which can be done when they're listed as the seller, but not if Amazon is), and got an immediate response with how to use.

    I sent my message at 6:05 PM on July 11th 2024, and got a reply back by 7:34 AM July 12th,
    Good Morning Kelly
    For soil drench, please mix 1 to 2 oz per gallon of water.
    Please see attached.
    We are awaiting new bags that will include the soil drench dosage amounts.
    Many thanks for your support!
    Cz Garden
    Images in this review
    Customer imageCustomer image
    One person found this helpful
    Helpful
     Report
  • Matthew A.
    4.0 out of 5 stars Worked great for my tomato plants
    Reviewed in the United States on August 13, 2024
    Color: Cz Garden Organics Gypsum 5LBVerified Purchase
    Just mixed with water and poured around the base of my plants. 5 days later and problem solved.
    2 people found this helpful
    Helpful
     Report
  • Robin Lodal
    5.0 out of 5 stars Good stuff
    Reviewed in the United States on February 20, 2025
    Color: Cz Garden Organics Gypsum 5LBVerified Purchase
    So far this product has worked as described.
    Helpful
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  • A. Mitch
    5.0 out of 5 stars Good product
    Reviewed in the United States on December 7, 2024
    Color: Cz Garden Organics Gypsum 5LBVerified Purchase
    It is exactly what it says it is and the price isn't bad. I will most likely buy this again when I run out. Delivery was om time and had no issue at all with this product.
    Helpful
     Report
  • Leroy Fisher
    5.0 out of 5 stars A product that works.
    Reviewed in the United States on July 24, 2024
    Color: Cz Garden Organics Gypsum 5LBVerified Purchase
    Easy to use and it provided the calcium the plants , especially tomatoes they needed.
    Helpful
     Report