Calcium nitrate granular fertilizer is a versatile nutrient option designed to boost vegetative vigor, strengthen cell walls, and prevent blossom end rot in fruiting crops. This guide highlights five reliable options that deliver both nitrogen and calcium in easily absorbed forms suitable for hydroponics, pots, and garden beds. Each product profile includes key features, application notes, and what to consider when choosing the right formula for your garden or indoor setup.
| Product | Brand | Form | Key Benefit |
|---|---|---|---|
| Cz Garden Calcium Nitrate 15.5-0-0 (5 lb) | Cz Garden Supply | Granular | Greenhouse-grade, high-purity calcium and nitrogen |
| PowerGrow Systems Calcium Nitrate 15.5-0-0 (5 lb) | PowerGrow Systems | Granular | Fully water soluble, easy uptake |
| Southern Ag Calcium Nitrate – 5 lb | Southern Ag | Granular | Excellent calcium and nitrogen source, BER prevention |
| TPS NUTRIENTS Calcium Nitrate Fertilizer (8 oz) | TPS NUTRIENTS | Granular | Calcium and nitrogen support, steady growth |
| Cz Garden Calcium Nitrate 15.5-0-0 (18 lb) | Cz Garden Supply | Granular | High-purity greenhouse-grade for larger needs |
Cz Garden Calcium Nitrate 15.5-0-0 (5 lb) — Greenhouse Grade
Calcium Nitrate 15.5-0-0 from Cz Garden Supply is a water-soluble, greenhouse-grade formula designed to boost healthy development in indoor flowers, lawn, and garden vegetables. It provides 19% calcium and 15.5% nitrogen, promoting green leafy growth and hardy plants. The product emphasizes high purity to avoid oily residues in irrigation equipment, making it suitable for hydroponic systems and fertigation. This option is ideal for tomato plants prone to blossom-end rot and for leafy greens requiring robust calcium support.
PowerGrow Systems Calcium Nitrate 15.5-0-0 (5 lb) — Agricultural Grade
PowerGrow Systems offers an agricultural-grade calcium nitrate that is fully water soluble for quick uptake by plants. This formulation provides a strong nitrogen boost to support lush vegetative growth, making it suitable for both container plants and larger garden beds. Its soluble nature simplifies mixing with irrigation systems, fertigation, or foliar feeding, enabling consistent nutrient delivery with minimal residue.
Southern Ag Calcium Nitrate — 5 Pound Bag
Southern Ag’s 5-pound bag provides a readily water-soluble source of 15.5% nitrogen and 19% calcium. This combination helps address calcium deficiencies while supporting robust vegetative growth. It is positioned as a versatile option for preventing blossom-end rot in fruiting crops and for improving calcium availability in soils that tend to be deficient. Suitable for both indoor and outdoor gardens, as well as hydroponic systems that require precise calcium delivery.
TPS NUTRIENTS Calcium Nitrate Fertilizer — 8 oz
TPS NUTRIENTS provides an 8-ounce calcium nitrate formula focused on calcium and nitrogen support for plant development. The product emphasizes readily available nutrients to support strong growth and balanced plant performance. This option is particularly suitable for gardeners seeking a compact, easy-to-store solution for houseplants, vegetables, and fruit-bearing plants that need steady calcium and nitrogen supply.
Cz Garden Calcium Nitrate 15.5-0-0 (18 lb) — Greenhouse Grade
An expanded 18-pound bag of Cz Garden Calcium Nitrate 15.5-0-0 offers the same greenhouse-grade purity and nutrient balance as the 5-pound option, with more value for larger setups. It provides 19% calcium and 15.5% nitrogen, supporting green leafy growth and hardy plants. The extended supply is well-suited for hydroponic systems, greenhouse operations, and season-long feeding programs for vegetables and fruiting crops.
Buying Guide: Key Considerations For Calcium Nitrate Fertilizers
- Form and solubility: Choose water-soluble, granular or liquid forms that fit your irrigation method, such as fertigation, soil drench, or foliar spray. Fully soluble products minimize clogs and ensure rapid uptake.
- NPK balance: Look for a 15.5-0-0 ratio (N-P-K) with a significant calcium content (around 19%) to address both growth and calcium-related deficiencies. Higher calcium helps prevent blossom end rot in tomatoes and peppers.
- Purity and grade: Greenhouse-grade or high-purity nitrate reduces residue in irrigation lines and on root surfaces. Avoid lower-grade products that may leave oily skim in solutions.
- Application targets: Consider whether you need rapid vegetative growth, BER prevention in fruiting crops, or steady nutrition for hydroponics and soil gardens.
- Compatibility: Assess compatibility with your existing nutrient solution and other fertilizers. Some systems require careful nutrient scheduling to avoid nutrient lockout or salinity buildup.
- Container size and frequency: For small indoor setups, 1–8 oz bottles are convenient. For larger greenhouses or multiple beds, bulk options (5–18 lb bags) provide greater value and longer-term feeding plans.
- Safety and storage: Store in a cool, dry place away from moisture. Follow label directions for mixing rates to prevent root burn or salinity stress.
- Plant targets: Tomatoes, peppers, melons, and leafy vegetables benefit from calcium and nitrate support. Leafy greens may require lower application rates with careful monitoring for calcium uptake.
Usage Tips And Best Practices
- Start with a soil test or tissue test to tailor calcium applications to your crop’s needs and avoid over-fertilization.
- Use consistent feeding schedules, especially during fruit set, to maintain steady calcium availability in the root zone.
- In hydroponic setups, dissolve the fertilizer completely before adding to the reservoir and monitor EC (electrical conductivity) and pH to keep conditions optimal.
- For plants prone to blossom end rot, ensure calcium is available at the roots and actively transported to developing fruits; consider pairing with calcium-rich amendments if soil conditions require.
- Inspect plants regularly for signs of deficiency or excess, such as leaf tip burn, yellowing, stunted growth, or fruit cracking, and adjust feeding accordingly.