Calcium nitrate granular fertilizer is prized for delivering both calcium and nitrogen to plants, supporting strong cell walls, vigorous growth, and reduced blossom end rot in fruiting crops. This guide highlights five top granular options from trusted brands, with practical considerations for home gardeners, greenhouse setups, and hydroponics enthusiasts. Compare forms, solubility, and application methods to choose the right product for your plants and grow space.
| Product | Brand | Size | Key Benefit | Link |
|---|---|---|---|---|
| Cz Garden Calcium Nitrate 15.5-0-0 (5 lb) | Cz Garden Supply | 5 lb | Water-soluble greenhouse grade calcium and nitrogen | Amazon |
| Calcium Nitrate 15.5-0-0 (5 lb) Bulk | PowerGrow Systems | 5 lb | Fully water soluble; easy uptake | Amazon |
| Southern Ag Calcium Nitrate (5 lb) | Southern Ag | 5 lb | 15.5% N, 19% Ca; prevents calcium deficiency | Amazon |
| Calcium Nitrate Fertilizer (8 oz) | TPS NUTRIENTS | 8 oz | Calcium and nitrogen support for steady growth | Amazon |
| Supply Solutions Calcium Nitrate 15.5-0-0 + 19% Ca (25 lb) | Supply Solutions | 25 lb | Fast-acting, prevents blossom end rot; robust growth | Amazon |
Note: The table above features granular calcium nitrate products suitable for soil, fertigation, and hydroponics projects. Always follow product-specific label directions for mixing rates and safety precautions.
Cz Garden Calcium Nitrate 15.5-0-0 (5 lb) — Greenhouse Grade
Calcium nitrate 15.5-0-0 is a water-soluble, premium quality fertilizer designed to support healthy development in indoor flowers, lawns, and garden vegetables. The product contains 19% calcium and 15.5% nitrogen, which promotes green leafy growth and hardy plants. It is positioned as greenhouse grade to minimize residues and compatibility concerns with irrigation systems.
Calcium Nitrate 15.5-0-0 (5 lb) Bulk
This agricultural-grade calcium nitrate is fully water soluble for rapid uptake by plants. It supplies high nitrogen levels to support lush vegetative growth, with the beneficial addition of calcium to strengthen cell walls and overall plant structure. Suitable for soil feeding and hydroponics alike, ensuring consistent performance across applications.
Southern Ag Calcium Nitrate — 5 Pound
Contains 15.5% nitrogen and 19% calcium, readily water soluble to support calcium and nitrogen delivery. This product helps prevent calcium deficiency and supports robust growth in vegetables, fruits, and ornamental plants. It is commonly used in gardens and greenhouse crops to improve yield quality and plant health.
Calcium Nitrate Fertilizer — 8 oz
Designed to supply essential calcium and nitrogen for plant development, this product supports strong growth and sturdy plant structure. It emphasizes highly available nutrition for consistent feeding, useful for houseplants, gardens, and hydroponic setups where precise calcium management is needed.
Supply Solutions Calcium Nitrate 15.5-0-0 + 19% Ca (25 lb)
This fast-acting, water-soluble fertilizer combines 15.5% nitrate nitrogen with 19% calcium to accelerate vegetative growth and strengthen cell walls. It is positioned to prevent blossom end rot in tomatoes, peppers, and other fruiting crops, while supporting robust yields in vegetables, fruits, and hydroponics systems.
Buying Guide: Key Considerations For Calcium Nitrate Granular Fertilizers
- Form and solubility: Granular calcium nitrate is typically preferred for slow-to-medium release and compatibility with fertigation or soil applications. Ensure the product is fully water soluble if you plan to mix with irrigation lines.
- Calcium and nitrogen balance: Look for products with a high calcium percentage (around 19%) and nitrogen around 15.5%. This combination supports both calcium-dependent cell structure and vigorous vegetative growth.
- Application method: Consider how you plan to apply — soil feeding, foliar spray, fertigation, or hydroponics. Some products are specifically marketed for hydroponics, while others excel in soil gardens.
- Certifications and grade: Greenhouse or greenhouse-grade materials are generally purer and less likely to leave residue in irrigation systems. Verify any claims about purity and packaging.
- Crop protection and BER prevention: For tomato and fruit crops, calcium nitrate helps prevent blossom end rot when used correctly. Balance with other nutrients to maintain overall plant health.
- Storage and handling: Calcium nitrate is hygroscopic. Store in a cool, dry place in a sealed container to prevent clumping and moisture absorption.
- Size and long-term use: Larger bags (e.g., 25 lb) offer more economical options for bigger gardens or greenhouse operations, while smaller packs are suitable for container plants or beginners.
- Safety: Follow label instructions for mixing, protective gear, and compatible equipment to avoid skin or eye irritation during handling.
- Environmental considerations: Use precise dosing to prevent nutrient runoff, especially in sandy soils or near water sources. Consider soil tests to tailor application rates.