Best Calcium Nitrate Fertilizer for Gardens and Hydroponics

#1 · Best Overall

1. Cz Garden Supply Calcium Nitrate

• Weight: 5 lb
• Form: Granules

Best for: Hydroponic and drip growers.

Why it ranks #1: Its 15.5-0-0 formula, 19% calcium, five-pound size, and stated 100% water solubility suit garden, hydroponic, and drip-irrigation feeding.

Greenhouse-grade, 100% water-soluble granules make Cz Garden Supply a practical choice for growers feeding plants through hydroponic or drip systems. Its 15.5-0-0 formula supplies nitrogen alongside 19% calcium, and the product is identified as Part B in the 321 feeding schedule for flowering plants.

The listed high-purity, fully water-soluble formula suits hydroponics, drip irrigation, and other systems, so growers can work it into those feeding workflows. Its 15.5-0-0 analysis pairs nitrogen with 19% calcium, addressing two nutrients in one fertilizer. Cz Garden Supply specifically identifies it as Part B or Part 2 of the 321 schedule, giving users following that schedule a defined role for the product. The five-pound granule package serves indoor flowers, lawn, and garden vegetables.

Skip it if you need a liquid supplement ready to apply; TPS NUTRIENTS Calcium Nitrate Liquid Supplement is supplied in liquid form.

For hydroponic, drip-irrigation, and garden growers using the 321 schedule, this five-pound greenhouse-grade option offers a clearly specified Part B role. Choose it when water-soluble granules fit your feeding setup.

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 Soil Directions

2. Southern Ag Calcium Nitrate

• Weight: 5 lb
• Form: Powder

Best for: Row and vegetable gardeners.

Why it ranks #2: It supplies 15.5% nitrogen and 19% calcium and gives a concrete side-dressing rate: one cup per 50 feet of row.

A stated side-dressing rate gives Southern Ag Calcium Nitrate a clear place in row and vegetable garden routines. The powder contains 15.5% nitrogen and 19% calcium, and its directions describe applying it over the root zone, away from the plant stem.

Southern Ag lists one cup per 50 feet of row or one teaspoon per plant, offering two application measures for different planting layouts. Its directions place the fertilizer over the root zone but not too close to the stem, helping users follow a defined placement method. The readily water-soluble powder supplies 15.5% nitrogen and 19% calcium, and the label names vegetables and flowers as suitable crops. The five-pound bag is the format for this soil-focused application.

Skip it if you need a fertilizer specifically identified for the 321 hydroponic schedule; Cz Garden Supply Calcium Nitrate is labeled as Part B for that routine.

Vegetable and flower gardeners who want a stated side-dressing rate can use this five-pound powder for row or individual-plant applications. Its directions call for root-zone placement, so it suits soil routines more directly.

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

#3 · Small Solution Pack

3. ENVY Solution Grade Calcium Nitrate

• Weight: 1.5 lb
• Form: Liquid

Best for: Tomato and pepper growers.

Why it ranks #3: This 1.5-pound solution-grade option lists 19% calcium, 15.5% nitrogen, and 100% water solubility for deficiency-focused feeding.

ENVY Solution Grade Calcium Nitrate pairs a stated 19% calcium content with 15.5% nitrogen to address calcium deficiency in tomatoes and peppers. Its greenhouse-grade, 100% water-soluble formula is presented as a soil amendment for preventing blossom-end rot.

The fully water-soluble formula is described as promoting solution disbursement, which suits growers mixing fertilizer into water for soil application. Its stated 19% calcium and 15.5% nitrogen provide the product’s central nutrient profile, while the listing specifically connects calcium deficiency with blossom-end rot in tomatoes and peppers. The 1.5-pound size is a defined quantity for garden use. Although the item form is listed as liquid, the title and feature text also describe solution-grade, water-soluble calcium nitrate.

Skip it if you need a clearly identified granular form; INTOMYTH Calcium Nitrate is listed as granules and dissolves in water.

Tomato and pepper growers addressing calcium deficiency may find its stated crop focus and soluble formula relevant. Check the format description against your preferred handling routine, since the listing identifies it as liquid and solution-grade.

Listed on Amazon as: ENVY Solution Grade Calcium Nitrate (15-0-0) Prevents Blossom End-Rot from Calcium Deficiency in Tomatoes & Peppers (1.5 lb)

#4 · Best Agricultural Grade

4. PowerGrow Systems Calcium Nitrate

• Weight: 5 lb
• Form: Powder

Best for: Vegetative-growth gardeners.

Why it ranks #4: The five-pound powder is agricultural grade, fully water soluble, and lists 15.5-0-0 nitrogen for growers seeking a larger-format fertilizer.

PowerGrow Systems combines fully water-soluble calcium nitrate with a high-nitrogen 15.5-0-0 analysis, supporting easy nutrient uptake and lush vegetative growth. The agricultural-grade powder also supplies calcium intended to strengthen cell walls and help prevent calcium deficiencies in garden plants.

The fully water-soluble powder is described as easy for plants to take up, making it suitable for growers who mix fertilizer into water. Its 15.5-0-0 analysis supplies high nitrogen for vegetative growth, while the calcium is associated with stronger cell walls and resilience. At five pounds, the package supports a garden routine without changing the product’s agricultural-grade classification. Handling directions call for protective clothing and gloves, and caution against applying to wet foliage or close to the stalk or crown.

Skip it if you want greenhouse-grade granules for a 321 hydroponic routine; Cz Garden Supply Calcium Nitrate is labeled for that use.

Gardeners seeking water-soluble agricultural-grade fertilizer for vegetative growth may value the nitrogen-and-calcium combination. Follow its handling and placement cautions, especially avoiding wet foliage and application near the stalk or crown.

#5

5. Supply Solutions Calcium Nitrate

• Weight: 5 lb
• Form: Granules

Best for: Large vegetable-garden growers.

Why it ranks #5: Its 15.5-0-0 formula and 19% calcium target vegetables, fruit, gardens, and hydroponics; the listed specifications give a five-pound weight.

A 15.5-0-0 analysis with 19% calcium gives Supply Solutions Calcium Nitrate a defined nutrient profile for garden feeding. The listing emphasizes fast water solubility, nitrate nitrogen for vegetative growth, and calcium for cell walls, with vegetables, fruit, gardens, and hydroponics named as uses.

The water-soluble granules offer a format for growers who want to prepare fertilizer for soil applications or hydroponic use, both named in the listing. Nitrate nitrogen is described as supporting vegetative development and green foliage, while 19% calcium is linked to cell-wall strength. The product also highlights blossom-end-rot prevention and fruit quality. Package quantity is inconsistent in the supplied facts: the title says 50 pounds, while specifications list five pounds, so verify the package information before planning a large application.

Skip it if you need an unambiguous package quantity before planning an application; Southern Ag Calcium Nitrate lists a five-pound bag.

Vegetable and fruit growers wanting a soluble nitrogen-and-calcium fertilizer can consider its stated soil and hydroponic uses. Resolve the conflicting package-weight information before choosing it for a planned application.

Listed on Amazon as: Supply Solutions Calcium Nitrate 15.5-0-0 + 19% Ca | Fast-Acting Water Soluble Fertilizer Prevents Blossom End Rot – Boosts Growth & Yield for Vegetables, Fruit, Gardens & Hydroponics (50 Pounds)

#6 · Added Micronutrients

6. Grow More Maxi-Cal

• Weight: 1.5 lb
• Form: Powder

Best for: Micronutrient-focused crop growers.

Why it ranks #6: The 10-0-0 powder differs from the 15.5-0-0 options and lists 10% calcium, magnesium, and eight essential micronutrients.

Grow More Maxi-Cal combines 10% calcium with magnesium and eight essential micronutrients, offering more than a nitrogen-and-calcium profile alone. Its 10-0-0 analysis supplies nitrogen, and the product is presented for plants, fruits, and vegetables facing calcium-deficiency concerns.

The 10-0-0 analysis makes nitrogen part of the formula, which the listing associates with growth spurts and helping plants thrive under stress. Alongside 10% calcium, magnesium and eight essential micronutrients broaden the stated nutrient mix for fruit and vegetable growers. The product is described as a calcium nitrate fertilizer and as a treatment for blossom end rot and root rot. Its powder form comes in a 16-ounce package, a manageable quantity for targeted plant-care routines.

Skip it if you prioritize a 19% calcium analysis; ENVY Solution Grade Calcium Nitrate lists 19% calcium with 15.5% nitrogen.

Fruit and vegetable growers seeking calcium alongside magnesium and multiple micronutrients may prefer this powder’s broader listed nutrient mix. Its 10% calcium analysis is a consideration for buyers prioritizing a higher stated calcium percentage.

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

#7

7. INTOMYTH Calcium Nitrate

• Weight: 8 oz
• Form: Granules

Best for: Drip-irrigation garden users.

Why it ranks #7: This granule lists 15.5-0-0 nitrogen and 19% calcium, and its additional facts say it dissolves with little residue.

Granules that dissolve fully with little residue let INTOMYTH Calcium Nitrate fit regular watering and drip-irrigation routines. Its 15.5-0-0 formula supplies 19% calcium and nitrogen, with the listing connecting those nutrients to stronger plants, lush growth, and tomato and pepper care.

The granules can be sprinkled over soil or mixed into planting medium, offering two ways to place the fertilizer in a garden routine. The listing also says they dissolve fully with little residue, supporting use with regular watering and drip irrigation. Its 19% calcium and 15.5% nitrogen are tied to cell-wall support and vigorous green growth. The title states one pound, while the specifications list eight ounces, so the package quantity is unclear in the supplied facts.

Skip it if you need a clearly stated package weight; Southern Ag Calcium Nitrate specifies a five-pound bag.

Gardeners who feed through soil, planting medium, regular watering, or drip irrigation can use its flexible granule directions. Confirm the package quantity from the product listing before deciding whether it suits your planned scale.

Listed on Amazon as: Calcium Nitrate 15.5-0-0 Fertilizer (1 lb) – Horticultural Grade Calcium Nitrate Soluble Plant Food for Hydroponics, Garden Plants, Fruit, Vegetables, Tomatoes

#8

8. FOVGOTAN Calcium Nitrate

• Form: Granules

Best for: Houseplant and indoor growers.

Why it ranks #8: The one-pound granular product lists a 15.5-0-0 ratio and is described for indoor plants, lawns, vegetables, and other plants.

A one-pound granular format and 15.5-0-0 nitrogen analysis make FOVGOTAN a compact option for indoor plant and garden feeding. Its listing connects nitrogen with leaf and stem growth and names houseplants, lawns, vegetables, and trees among its intended plant uses.

The granular form gives indoor and garden growers a dry fertilizer format, while the one-pound package is a defined quantity for a smaller-scale routine. Its 15.5-0-0 analysis emphasizes nitrogen, which the listing associates with vigorous leaf and stem growth. Calcium is included in the formula, and the product is presented for houseplants, lawns, vegetables, and trees. Those broad named uses make it relevant across several plant settings, though the supplied facts do not give an application rate.

Skip it if you need a listed application rate for row or individual-plant side dressing; Southern Ag Calcium Nitrate specifies both measures.

Indoor growers and gardeners feeding houseplants, lawns, vegetables, or trees can consider this one-pound granular nitrogen-and-calcium fertilizer. It fits buyers comfortable using the product’s listed facts without a stated application rate.

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

#9

9. TPS Nutrients Calcium Nitrate

• Form: Liquid

Best for: Liquid-feed garden growers.

Why it ranks #9: This eight-ounce liquid is intended for vegetables, fruits, and general garden plants, but the supplied details do not state a nutrient ratio.

A liquid formulation sets TPS NUTRIENTS Calcium Nitrate apart for gardeners who prefer a supplement supplied in liquid form. The eight-ounce product is described as providing readily available nutrients for consistent feeding, with stated use across vegetables, fruits, and general garden plants.

The liquid form may fit a feeding workflow that uses liquid supplements, while the product description emphasizes readily accessible nutrients for consistent feeding. Its stated garden and crop scope includes vegetables, fruits, and general garden plants, giving it broad listed use across edible and ornamental settings. TPS NUTRIENTS also describes support for sturdy growth and plant structure. Directions are included, so buyers can consult the supplied instructions rather than relying on a rate not specified in the product facts.

Skip it if you need a stated 15.5-0-0 nitrogen analysis; Southern Ag Calcium Nitrate lists 15.5% nitrogen and 19% calcium.

Choose this liquid supplement if your garden feeding routine favors a ready liquid form and spans vegetables, fruits, or general garden plants. Buyers comparing nutrient ratios should note that its listed facts do not state one.

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

#10

10. CFUTABOH Calcium Nitrate

• Weight: 4.54 g
• Form: Powder

Best for: Tomato and small-garden growers.

Why it ranks #10: It lists 15.5% nitrogen and 19% calcium, but the supplied weight is 4.54 grams while the title says one pound, making package sizing unclear.

Fine powder that dissolves rapidly with no leftover sediment makes CFUTABOH convenient for growers mixing calcium nitrate into water. Its 15.5-0-0 formula supplies nitrate nitrogen and soluble calcium, and the listing highlights tomato fruiting and blossom-end-rot concerns.

The product describes its fine powder as rapidly dissolving without leftover sediment, which supports mixing for root watering or leaf spraying. Its 15.5-0-0 analysis combines nitrate nitrogen with 19% calcium, linking growth nutrition with a calcium source. The listing calls it a choice for tomato plants during fruiting and also names hydroponics, gardens, fruits, and vegetables. At one pound according to the title, it offers a smaller stated package than bulk garden formats.

Skip it if you need a five-pound supply for larger garden applications; Southern Ag Calcium Nitrate comes in a five-pound bag.

Tomato growers and small-garden users mixing fertilizer for root watering or leaf spraying may appreciate the soluble powder. The title’s one-pound size is the relevant boundary for buyers planning broader applications.

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