We remain fully operational. Our teams are working around the clock to ensure your deliveries continue safely.
DOWNLOAD THE APP
Customer Services
Copyright © 2025 Desertcart Holdings Limited
DOWNLOAD THE APP
Buy anything from 5,000+ international stores. One checkout price. No surprise fees. Join 2M+ shoppers on Desertcart.
Desertcart purchases this item on your behalf and handles shipping, customs, and support to USA.
🌱 Feed smart, grow strong — don’t let your garden miss out!
Jack's Nutrients 15-0-0 Part B Calcium Nitrate is a 25lb water-soluble fertilizer powder formulated to deliver essential calcium and nitrate nitrogen. Ideal for continuous liquid feed programs, especially hydroponics, it promotes strong leaf growth and optimal nutrient uptake. Trusted by gardeners with a 4.7-star rating, it mixes easily at 8.6 ounces per 100 gallons, offering a customizable and efficient feeding solution.
| ASIN | B07CY62XXP |
| Best Sellers Rank | #51,605 in Patio, Lawn & Garden ( See Top 100 in Patio, Lawn & Garden ) #1,393 in Garden Fertilizers |
| Brand Name | Jack's Classic |
| Coverage | 25 |
| Customer Reviews | 4.7 4.7 out of 5 stars (605) |
| Item Form | Powder |
| Item Weight | 25 Pounds |
| Liquid Volume | 1 Quarts |
| Manufacturer | JR Peters |
| Mixing Ratio | 8.6 ounces per 100 gallons |
| Model Number | 79080 |
| Specific Uses For Product | Leaf Growth, Plant Growth |
| Target Species | plants |
| UPC | 671341790808 |
| Unit Count | 400.0 Ounce |
C**A
Always Great Results
Can’t go wrong with Jack’s 321 line of products as long as it’s mixed properly. Always thumbs up!
J**C
Never disappointed
I've used this for years and its never disappointed.
E**E
The best
Hands down the best hydroponic fertilizer I have ever used!!!! This is like giving steroids to your pl!!! This will make them grow so quickly and produce more so long as you follow specific instructions! Very easy to use as long as you know how to measure!!! I’m a lifelong customer of this product!!!!
J**.
Jacks 321 for the win!
I started using the Jacks 321 formula in hydro and now use it in all my grows.
M**E
Jacks great nutes for $
Much cheaper and better than it’s competitors
T**E
I Wish They Had Organics
Then only reason for the 4 vs a 5 is my desire to have organic nutrients for my hydroponics. I cannot seem to find any that work as well.
E**D
The best hydroponic nutrients I have ever used.
For the money you get a good supply of fertilizer that is easy to mix and is the best I have found. If you want healthy plants you will be more then happy using this.
W**Y
Perfect quality
Don't buy any other brands of cal nitrate...this one is the best quality and it truly does make a difference..dissolves better too..
Trustpilot
2 months ago
5 days ago