Best Organic Calcium for Tomato Plants in 2025
Updated on August 2025
#1
Recommended
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- Garden of Life Organics provides a plant-based calcium magnesium formula with 1,000mg of Calcium and 60mg of Magnesium, along with Vegan D3 and Vitamin K2.
- The calcium supplement is derived from organic algae, ensuring easy digestion compared to traditional sources.
- These tablets are designed for easy swallowing and high bioavailability using Clean Tablet Technology.
- The calcium vitamin is made from over 20 fruits and vegetables, emphasizing the use of real food ingredients.
- The product is certified organic, non-GMO, vegan, gluten-free, and kosher, with no synthetic additives.
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- Garden of Life Organics provides a plant-based calcium magnesium formula with 1,000mg of Calcium and 60mg of Magnesium, along with Vegan D3 and Vitamin K2.
- The calcium supplement is derived from organic algae, ensuring easy digestion compared to traditional sources.
- These tablets are designed for easy swallowing and high bioavailability using Clean Tablet Technology.
- The calcium vitamin is made from over 20 fruits and vegetables, emphasizing the use of real food ingredients.
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#2
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- Regulates nutrient uptake and cell wall membrane formation in plants
- Prevents calcium deficiency symptoms like poor root development and yellowing of new tissues
- Fully water-soluble and chelated for improved utilization and foliar absorption
- OMRI listed and CDFA Registered Organic Input Material
- Contains a 5.0% calcium formula
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- Regulates nutrient uptake and cell wall membrane formation in plants
- Prevents calcium deficiency symptoms like poor root development and yellowing of new tissues
- Fully water-soluble and chelated for improved utilization and foliar absorption
- OMRI listed and CDFA Registered Organic Input Material
- Contains a 5.0% calcium formula
#3
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- Suitable for all tomato varieties, including heirloom and hybrid, as well as all vegetables.
- Contains a blend of natural organic ingredients with added calcium to prevent blossom end rot; fertilizer analysis of 3-4-6 enhanced with Bio-tone formula.
- Apply every two weeks during the growing season around the plant's drip line and water thoroughly; no mixing required.
- Approved for organic gardening, classified as a registered Organic Input Material for compliance with organic standards.
- Made in the USA by Espoma Company, a leader in natural organics since 1929.
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- Suitable for all tomato varieties, including heirloom and hybrid, as well as all vegetables.
- Contains a blend of natural organic ingredients with added calcium to prevent blossom end rot; fertilizer analysis of 3-4-6 enhanced with Bio-tone formula.
- Apply every two weeks during the growing season around the plant's drip line and water thoroughly; no mixing required.
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#4
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- Formulated for long-lasting results
- Easy-to-apply granules release essential nutrients immediately and sustain for up to 3 months
- Enhances plant growth and yield throughout the season
- OMRI listed for organic use
- Suitable for young bedding plants, vegetable gardens, and patio containers
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- Formulated for long-lasting results
- Easy-to-apply granules release essential nutrients immediately and sustain for up to 3 months
- Enhances plant growth and yield throughout the season
- OMRI listed for organic use
- Suitable for young bedding plants, vegetable gardens, and patio containers
#5
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- Controls blossom end rot in tomatoes by adding calcium.
- Contains nutritional calcium derived from calcium chloride.
- Effective for correcting calcium deficiencies in cucumbers, melons, and peppers.
- Easily mixes with water for application using a hose-end or tank sprayer; spray foliage to the point of run-off.
- Intended as a supplement to a regular fertilization program; may not provide all necessary nutrients alone.
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- Controls blossom end rot in tomatoes by adding calcium.
- Contains nutritional calcium derived from calcium chloride.
- Effective for correcting calcium deficiencies in cucumbers, melons, and peppers.
- Easily mixes with water for application using a hose-end or tank sprayer; spray foliage to the point of run-off.
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#6
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- Water-soluble calcium nitrate fertilizer with 15.5-0-0 formulation for effective nitrogen and calcium supply.
- High purity ensures no oily residue in solutions, beneficial for irrigation systems and plant root health.
- Contains 19% calcium and 15.5% nitrogen, supporting vigorous leaf growth and overall plant health.
- Compatible with various growing methods: hydroponics, drip irrigation, and soil gardening.
- Comes in a resealable 5LB pouch for easy pouring and storage.
- Manufactured in the USA with high-quality ingredients.
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- Water-soluble calcium nitrate fertilizer with 15.5-0-0 formulation for effective nitrogen and calcium supply.
- High purity ensures no oily residue in solutions, beneficial for irrigation systems and plant root health.
- Contains 19% calcium and 15.5% nitrogen, supporting vigorous leaf growth and overall plant health.
- Compatible with various growing methods: hydroponics, drip irrigation, and soil gardening.
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#7
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- Helps prevent common plant issues, including blossom end rot and tip burn, by fortifying against deficiencies.
- Contains a specialized 1-0-0 formula with 3% calcium and 0.9% magnesium, enhancing the quality of fruits and vegetables.
- Promotes stronger cell structures and resilience in plants, enabling them to withstand environmental stresses.
- Simple application: mix 1 tsp per gallon of water; start before bud development to provide essential nutrients during growth phases.
- Optimal pH range of 5.6 to 6.8 recommended for best nutrient absorption and robust plant growth.
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- Helps prevent common plant issues, including blossom end rot and tip burn, by fortifying against deficiencies.
- Contains a specialized 1-0-0 formula with 3% calcium and 0.9% magnesium, enhancing the quality of fruits and vegetables.
- Promotes stronger cell structures and resilience in plants, enabling them to withstand environmental stresses.
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#8
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- Suitable for all types of tomatoes, including heirloom and hybrid varieties, as well as other vegetables.
- Contains a rich blend of natural and organic ingredients, featuring a 3-4-6 fertilizer formula with 8% calcium to help prevent blossom end rot.
- Recommended use every two weeks during the growing season; apply around the plant's drip line and water thoroughly.
- Approved for organic gardening and meets all standards for organic production.
- Manufactured in the USA by Espoma Company, a leader in natural organics since 1929.
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- Suitable for all types of tomatoes, including heirloom and hybrid varieties, as well as other vegetables.
- Contains a rich blend of natural and organic ingredients, featuring a 3-4-6 fertilizer formula with 8% calcium to help prevent blossom end rot.
- Recommended use every two weeks during the growing season; apply around the plant's drip line and water thoroughly.
- Approved for organic gardening and meets all standards for organic production.
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#9
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- Down to Earth Garden Lime is a five-pound bag of natural mineral fertilizer certified for organic use by OMRI.
- Natural limestone is finely ground and shaped into uniform mini granules for easy application and quick results.
- Increases soil pH to enhance plant growth and optimize fertilizer effectiveness.
- Provides calcium, a crucial nutrient for healthy plant development.
- Listed as a Registered Organic Input Material by CDFA.
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- Down to Earth Garden Lime is a five-pound bag of natural mineral fertilizer certified for organic use by OMRI.
- Natural limestone is finely ground and shaped into uniform mini granules for easy application and quick results.
- Increases soil pH to enhance plant growth and optimize fertilizer effectiveness.
- Provides calcium, a crucial nutrient for healthy plant development.
- Listed as a Registered Organic Input Material by CDFA.
#10
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- Contains natural and organic nutrients for safe plant growth without toxic chemicals.
- Includes an easy-to-use scoop for convenient application.
- Formulated with essential nutrients and beneficial bacteria for enhanced soil health.
- Provides vital nutrients like Humic Acid and L-Amino Acids to support robust plant development.
- Suitable for both indoor and outdoor plants, including vegetables and flowers.
- Water-soluble formula for easy application and absorption, promoting healthy growth.
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- Contains natural and organic nutrients for safe plant growth without toxic chemicals.
- Includes an easy-to-use scoop for convenient application.
- Formulated with essential nutrients and beneficial bacteria for enhanced soil health.
- Provides vital nutrients like Humic Acid and L-Amino Acids to support robust plant development.
- Suitable for both indoor and outdoor plants, including vegetables and flowers.
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