PowerGrow Systems Calcium Nitrate Fertilizer 5 lbs NPK 15.5-0-0 for Hydroponics and Garden Plants
Calcium Nitrate Fertilizer (5 Pounds)
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PowerGrow Systems

Calcium Nitrate Fertilizer (5 Pounds)

110 ratings

Key item features

  • Essential Nutrient Blend: Features an NPK ratio of 15.5-0-0, enriched with calcium, promoting robust plant development.
  • Versatile Application Methods: Suitable for hydroponic systems, soil application as a side dressing, and foliar spraying for comprehensive plant nourishment.
  • Hydroponic Use Guidance: Recommended for use with other balanced fertilizers, such as MasterBlend, with specific mixing instructions for a 5-gallon solution.
  • Soil & Foliar Directions: Provides precise application rates for both foliar sprays (2-4 tsp per gallon) and soil side dressing (1 pound per 100 feet of row).
  • Apple Tree Specifics: Offers tailored ground application instructions for apple trees, varying by tree age, with a maximum of 8 pounds per tree.
  • Enhanced Plant Vigor: High nitrogen content encourages lush vegetative growth, while soluble calcium strengthens cell walls and prevents deficiencies like blossom end rot.
  • Agricultural Grade Solubility: A 100% water-soluble fertilizer, ensuring easy uptake by plants for efficient nutrient delivery.
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Specs

Fertilizer type, SyntheticNpk ratio, 15.5-0-0Form, CrystalsRec. use, Plant, TreeRec location, OutdoorSize, 5 lbs

About this item

Product details

Calcium Nitrate is a fantastic 100% water soluble fertilizer that is used by hobbyists and professional growers world wide. It's high nitrogen levels encourage lush vegetative growth, and the water soluble calcium increases cell wall strength in plants and can prevent common calcium deficiencies like blossom end rot in tomatoes. 100% Agricultural Grade Fertilizer. Fully water soluble - easy uptake by your plants! Promotes lush green vegetative growth Calcium increases plant resilience and prevents calcium deficiencies.

    • Calcium Nitrate Fertilizer (5 Pounds)
    • NPK Ratio of 15.5-0-0 + Calcium
    • HYDROPONIC APPLICATION RATES: It is recommended to use in conjunction with other balanced fertilizers (We recommend MasterBlend by PowerGrow). A suggested starting solution consists of 12g MasterBlend 4-18-38 fertilizer and 6g Epsom Salts (Completely dissolve in 5 gallons of water)
    • and finally 12g Calcium Nitrate dissolved in water as the last step. SOIL & FOLIAR
    • APPLICATION INSTRUCTIONS: Foliar Application: Mix 2-4 tsp per 1 gallon of water and spray the foliage. As a Supplemental (Side Dressing)
    • Fertilizer Application: Apply 1 pound per 100 feet of row (1 cup per 50 feet of row or 1 level tablespoonful per plant). Apply to root growing area. Do not place within 2 inches of stalk or crown of plants. Do not allow contact with wet foliage
    • On Apples: Ground application broadcast under the tree. Use at a rate of 1/2 pound for each year of tree growth to a maximum of 8 pounds per tree. Apply in February or apply in split applications in February and October
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Specifications

Fertilizer type

Synthetic

Npk ratio

15.5-0-0

Form

Crystals

Rec. use

Plant, Tree

Warranty

Warranty information

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Customer ratings & reviews

4.7 out of 5 stars
stars
110 ratings42 reviews
Includes global ratings and reviews
How item rating is calculated
  1. 5 stars85% (93)
  2. 4 stars10% (11)
  3. 3 stars0% (0)
  4. 2 stars0% (0)
  5. 1 star5% (6)

Reviews summary

Pros

  • : Helps plants recover from yellowing and promotes growth.
  • : Offers reasonable prices compared to similar products.
  • : Dissolves quickly in water.
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Showing 1-3 of 42 reviews

Nov 6, 2026
Reviewer name: Victor
Top Reviewer
Sold and shipped byFisch Industries USA
5 out of 5 stars
5 out of 5 stars review

Verified Purchase

Good for Tomato plants to prevent end blossom Rot.

Helpful?4AEYU11J2DN5550772190
Dec 9, 2025
Reviewer name: Walmart customer
Sold and shipped byFisch Industries USA
5 out of 5 stars
5 out of 5 stars review

Verified Purchase

good for you're garden

if your getting blossom rot on your fruit and veggies- this stopped its for me

Helpful?4AEYU11J2DN5550772190
Jul 17, 2025
Reviewer name: anna
Top Reviewer
Sold and shipped byFisch Industries USA
5 out of 5 stars
5 out of 5 stars review

Verified Purchase

great

worked great dissolves quickly

Helpful?4AEYU11J2DN5550772190
Current price is $17.59
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Sold and shipped by Fisch Industries USA
4.517374517374518 out of 5 stars
4.5 stars out of 5, based on 259 seller reviews(4.5)
Extended holiday returns
Free Holiday returns until Jan 31