Best Nitrate Fertilizer For Plants: Compare 10 Options

#1 · Best Overall

1. Cz Garden Supply Calcium Nitrate

• Form: Granules
• Weight: 5 lb

Best for: Hydroponic calcium-nitrate growers.

Why it ranks #1: Its 15.5-0-0 analysis, stated 19% calcium, and water-soluble greenhouse-grade granules suit growers seeking a clearly specified dual-nutrient product.

Greenhouse-grade, 100% water-soluble granules combine 15.5% nitrogen with 19% calcium, making this a focused option for feeding plants through hydroponic or garden systems. The listing specifically connects calcium nitrate with blossom-end-rot deficiencies in tomatoes and peppers, while identifying it as Part B in the 321 feeding schedule.

The water-soluble formula is listed for hydroponics, drip irrigation, and other systems, so it can suit growers already delivering nutrients through water rather than relying only on dry placement. Its 15.5-0-0 analysis supplies nitrogen alongside 19% calcium, addressing two nutrient needs in one product. The 5-pound granule package is a substantial supply for repeated feeding, and the specified 321 schedule provides a reference point for growers who use that established approach.

Skip it if you need a ready-to-use liquid supplement; TPS Nutrients Calcium Nitrate Liquid Supplement is sold in liquid form.

A good fit for hydroponic and garden growers seeking water-soluble nitrogen and calcium, particularly those following the 321 schedule or tending tomatoes and peppers. Consider the specified feeding directions when planning how it fits your nutrient routine.

Listed on Amazon as: Calcium Nitrate 15.5-0-0 Fertilizer – Made in USA – 5LB Greenhouse Grade Plant Food for Hydroponics, Plants & Gardens – Fruit, Vegetables. Blossom End Rot Tomatoes

#2 · Best Rate Guidance

2. Southern Ag Calcium Nitrate

• Form: Powder
• Weight: 5 lb

Best for: Vegetable side-dressing gardeners.

Why it ranks #2: It supplies 15.5% nitrogen and 19% calcium, and lists application guidance of one cup per 50 feet of row or one teaspoon per plant.

A stated side-dressing use makes Southern Ag Calcium Nitrate a practical choice for gardeners feeding growing crops along the root zone. Its readily water-soluble 15.5% nitrogen and 19% calcium formula supplies both nutrients, and the product is listed for most vegetables and flowers.

The directions give application quantities—one cup per 50 feet of row or one teaspoon per plant—so gardeners can plan side-dressing by planting layout. Applying over the root zone, but not too close to the stem, offers a clear placement guideline. Because the powder is readily water soluble, it can supply nitrogen and calcium in a form the listing describes as soluble. The 5-pound bag suits users planning applications across vegetables or flowers.

Skip it if you need a product specifically identified for hydroponics; Cz Garden Supply Calcium Nitrate is listed for hydroponic systems.

A sensible match for vegetable and flower gardeners who want clear side-dressing rates and root-zone placement guidance. It may not suit growers seeking a product specifically labeled for hydroponic feeding rather than soil application.

Listed on Amazon as: Southern Ag Calcium Nitrate – 5 Pound Bag

#3 · Best Powder Option

3. PowerGrow Systems Calcium Nitrate

• Form: Powder
• Weight: 5 lb

Best for: Water-soluble calcium-nitrate powder.

Why it ranks #3: This 5-pound agricultural-grade powder lists 15.5-0-0 and water solubility, with nitrogen and calcium for vegetative growth and deficiency prevention.

Fully water-soluble calcium nitrate powder pairs a 15.5-0-0 analysis with calcium, giving growers a mixable source of nitrogen for vegetative growth and calcium for plant resilience. PowerGrow Systems identifies the product as agricultural grade and says the soluble nutrients support easy uptake by plants.

The powder form can be dissolved for a water-based application, and the listing emphasizes full water solubility as a route to easy plant uptake. Its high nitrogen level is described as promoting lush green vegetative growth, while calcium is tied to resilience and preventing calcium deficiencies. At 5 pounds, the package provides a larger quantity for ongoing use than a small trial-size product. Handling directions call for gloves and protective clothing and caution against application to wet foliage.

Skip it if you want greenhouse-grade granules rather than agricultural-grade powder; Cz Garden Supply Calcium Nitrate is listed as greenhouse grade.

Consider this for growers who want a soluble powder combining nitrogen and calcium for vegetative growth, and can follow its handling directions. Its agricultural-grade designation matters if you are specifically shopping for greenhouse-grade fertilizer.

#4 · Best Quick-Dissolving

4. CFUTABOH Calcium Nitrate

• Form: Powder
• Weight: 4.54 g

Best for: Tomato growers using soluble powder.

Why it ranks #4: The fine powder is described as rapidly dissolving without leftover sediment, and its listed nutrient analysis includes 15.5% nitrogen and 19% calcium.

Fine powder that dissolves rapidly without leftover sediment gives this calcium nitrate a clear role in water-based feeding. CFUTABOH lists 15.5% nitrogen and 19% calcium, with root watering and leaf spraying among its stated applications and tomato fruiting specifically noted as a use case.

The rapid-dissolving powder can simplify preparing water for root watering or leaf spraying, and the no-sediment claim may help keep the prepared solution free of leftover material. Its nitrate nitrogen and soluble calcium pair growth support with cell-structure support, according to the listing. Tomato plants during fruiting are singled out, while vegetables and garden cultivation broaden its stated uses. Follow the product's own directions when deciding application amounts; none are specified in the supplied details.

Skip it if you require a listed feeding schedule or precise dose; Southern Ag Calcium Nitrate provides row and per-plant application rates.

Tomato growers looking for a water-soluble powder for root watering or leaf spraying may find this formulation relevant. The lack of a supplied dose means it is a weaker fit for anyone needing exact application quantities on the listing.

Listed on Amazon as: Calcium Nitrate Fertilizer 15.5-0-0, Plant Calcium Nutrient Supplement for Tomato Plants Vegetables Garden Cultivation (1 LB)

#5

5. FOVGOTAN Calcium Nitrate

• Form: Granules

Best for: Small-package indoor and garden feeding.

Why it ranks #5: Its 1-pound package and 15.5-0-0 granular formula offer a compact option for buyers seeking nitrogen with calcium for indoor or garden plants.

The one-pound package gives houseplant and garden growers a smaller quantity of 15.5-0-0 calcium nitrate to keep on hand. FOVGOTAN describes its granular formula as high in nitrogen, with nutrition intended to promote steady growth and support leaf and stem development across plant types.

Granules offer a dry format for storage and handling, while the stated 15.5-0-0 ratio identifies this as a nitrogen-focused fertilizer with calcium. The listing connects nitrogen to vigorous leaf and stem growth and describes the product for houseplants, lawn, vegetables, and trees, making it relevant to mixed plant collections. A one-pound quantity can be convenient where a larger supply is unnecessary, though the supplied information does not give an application rate or calcium percentage.

Skip it if you need a stated calcium percentage or application schedule; Southern Ag Calcium Nitrate lists 19% calcium and application rates.

This is a fit for growers seeking a compact granular nitrogen-and-calcium product for houseplants or a varied garden. Choose another option if your feeding plan depends on a stated calcium percentage or precise application directions.

Listed on Amazon as: 1LB Calcium Nitrate Fertilizer, 15.5-0-0 Nitrogen Fertilizer with Calcium, Indoor Plant Fertilizer, Plant Food for Houseplants, Lawn, Vegetable, Trees, Boost Stem & Leaf Growth, Improves Root Health

#6

6. TPS Nutrients Calcium Nitrate

• Form: Liquid

Best for: Liquid calcium-nitrate supplement users.

Why it ranks #6: This liquid calcium nitrate is intended for garden and crop use and supports consistent feeding, but the listing gives no nutrient analysis or package weight.

A liquid form sets this 8-ounce calcium nitrate supplement apart, letting gardeners choose a liquid product for feeding vegetables, fruit, and general garden plants. TPS Nutrients describes it as readily available plant nutrition that supports sturdy growth and plant structure, with directions included to guide application.

The liquid formulation offers an alternative to measuring a powder or granules, while the included directions give users application guidance. Its stated role is to provide readily accessible nutrients for consistent feeding, connecting the formula to regular plant care rather than a single crop-specific use. TPS lists vegetables, fruits, and general garden plants as suitable uses, so one bottle can serve a mixed garden. The product information does not specify a concentration or mixing rate.

Skip it if you need a stated NPK analysis or exact mixing rate; Cz Garden Supply Calcium Nitrate 15.5-0-0 provides a listed analysis.

This suits gardeners who prefer a liquid supplement for varied crops and value included directions. It is less appropriate when a labeled nitrogen analysis or specific dilution rate is essential to matching a detailed feeding plan.

Listed on Amazon as: Calcium Nitrate Fertilizer – Liquid Supplement for Strong Growth, 8 oz

#7 · Best Magnesium Source

7. Greenway Biotech Magnesium Nitrate

• Form: Granules
• Weight: 2 lb

Best for: Magnesium-deficiency correction growers.

Why it ranks #7: Its 11-0-0 analysis includes 9.6% magnesium, making it the distinct choice here when plants need magnesium as well as nitrate nitrogen.

A dual-nutrient 11-0-0 formula with 9.6% magnesium makes this a magnesium nitrate fertilizer, not calcium nitrate. Greenway Biotech lists 100% water solubility for hydroponics, soil, and foliar use, positioning it for growers seeking nitrogen alongside magnesium to address magnesium deficiency.

The 11% nitrogen and 9.6% magnesium combination brings both nutrients in one application, while the listed water solubility supports use in hydroponics, soil, or foliar feeding. The product specifically targets magnesium deficiency, so it is better matched to that nutrient need than to calcium supplementation. Its two-pound granule package offers a supply for repeated use. The listing says it dissolves in warm or cold water without residue, which can simplify preparing solutions across different application methods.

Skip it if you need calcium to address calcium deficiency; Southern Ag Calcium Nitrate supplies 19% calcium alongside nitrogen.

A fit for growers who have a magnesium-focused feeding need and want a soluble product usable in hydroponics, soil, or foliar applications. It is not the right match when the goal is supplying calcium nitrate.

Listed on Amazon as: Greenway Biotech Magnesium Nitrate Fertilizer 11-0-0 with 9.6% Mg and 11% Nitrogen – 100% Water Soluble for Hydroponics Soil Foliar – Corrects Magnesium Deficiency – Made in USA – 2 Pounds

#8

8. TPS Nutrients Potassium Nitrate

• Form: Liquid
• Weight: 0.31 kg

Best for: Growers seeking potassium nitrate.

Why it ranks #8: The liquid formula supplies nitrogen and potassium and is described for root, flowering, and fruit development, rather than calcium supplementation.

A liquid potassium nitrate supplement, rather than a calcium nitrate fertilizer, is the defining distinction of this TPS Nutrients product. It combines nitrogen and potassium in an 8-ounce format and is described as supporting root development, foliage, flowering, and fruit development for growers targeting those needs.

The liquid formulation gives gardeners a different format from dry fertilizers, while its stated nitrogen-and-potassium role connects the product to growth and root development. TPS also lists flowering and fruit development as intended benefits, making it more relevant when those are priorities than when calcium supplementation is the goal. The 8-ounce size is a modest bottle for targeted use. Store it in a cool, dry place away from heat and open flames, as directed in the supplied safety information.

Skip it if you specifically need calcium nitrate; Cz Garden Supply Calcium Nitrate 15.5-0-0 supplies nitrogen and calcium.

Choose this only if potassium nitrate and its stated root, flowering, or fruit-development uses match your feeding goal. Gardeners assembling a calcium-nitrate roundup should note that this product supplies potassium instead of calcium.

Listed on Amazon as: Potassium Nitrate Fertilizer, Liquid Nitrogen & Potassium Supplement, 8 oz

#9

9. Hoss Chilean Nitrate

• Form: Liquid
• Weight: 10 lb

Best for: Organic vegetable side-dressing users.

Why it ranks #9: This 10-pound product is described as OMRI certified for organic vegetable production and provides naturally derived sodium nitrate for heavy-feeding crops.

OMRI certification for organic vegetable production distinguishes Hoss Chilean Nitrate, a naturally derived sodium nitrate rather than calcium nitrate. Its pelleted form is described as easy to spread by hand or walk-behind spreader, and the listing highlights heavy-feeding crops such as corn and onions.

The product supplies nitrate nitrogen from sodium nitrate collected from natural rock deposits, giving organic vegetable growers a listed nitrogen source. Pellets can be spread by hand or with a walk-behind spreader, and the product can also be dissolved in water for injection through a watering system. Those options suit either dry side-dressing or water-based delivery. The 10-pound resealable bag supports repeated use, while the listing names corn and onions as heavy-feeding crops it suits.

Skip it if you need calcium nitrate rather than an organic sodium-nitrate nitrogen source; Cz Garden Supply Calcium Nitrate supplies nitrogen and calcium.

Organic vegetable growers seeking a nitrogen source for crops such as corn and onions may value its spreadable pellets and water-system option. It is not a fit when calcium supplementation is the primary requirement.

Listed on Amazon as: Chilean Nitrate Fertilizer | Organic Nitrogen Source for Vegetables | 10 lb Bag

#10

10. Grow More Maxi-Cal

• Form: Powder
• Weight: 1.5 lb

Best for: Micronutrient-rich liquid-calcium users.

Why it ranks #10: Its 10-0-0 powder includes 10% calcium, magnesium, and eight micronutrients, but its listed nutrient balance is less specific to nitrate fertilizer selection.

Ten percent calcium, magnesium, and eight essential micronutrients distinguish Grow More Maxi-Cal from simpler calcium nitrate formulas. The 10-0-0 analysis adds nitrogen, while the product is presented as a way to address calcium deficiency and support growth in fruits and vegetables, including plants under stress.

The combination of calcium, magnesium, and eight micronutrients gives growers several listed nutrients in one formula, while the 10-0-0 ratio identifies its nitrogen contribution. The product is positioned for fruits and vegetables and links its nitrogen to growth spurts and performance under stress. Its 16-ounce quantity offers a manageable supply for targeted crop care. The listing identifies the form as powder, so buyers should account for preparing and applying a powder rather than expecting a ready-to-use liquid.

Skip it if you want a ready-to-use liquid calcium supplement; TPS Nutrients Calcium Nitrate Liquid Supplement is listed in liquid form.

This may suit fruit and vegetable growers seeking calcium alongside magnesium and micronutrients, especially when addressing deficiency concerns. Its powder form is the key fit consideration for users who prefer a liquid product requiring no preparation.

Listed on Amazon as: Grow More Maxi-Cal (10-0-0) – 16oz of USA-Made Calcium Nitrate Fertilizer – Provides Nitrogen & Liquid Calcium for Plants, Fruits, & Vegetables – Blossom End Rot & Root Rot Treatment