Best Organic Liquid Fertilizer for Plants in 2025
Updated on August 2025
#1
Recommended
- OMRI Listed Organic Seaweed & Kelp Fertilizer: A natural liquid kelp fertilizer that enhances plant health by optimizing soil conditions and improving nutrient uptake without harmful chemicals.
- Natural Plant Food from Ascophyllum Nodosum: This seaweed extract boosts plants' tolerance to extreme conditions like heat and drought, enhancing chlorophyll levels for greener leaves and increased sugar content.
- Widely Used for Improved Plant Nutrition: Suitable for commercial and home gardening, this seaweed fertilizer promotes better nutrient uptake and supports overall plant well-being.
- Simple Application for Effective Results: Mix 2 ounces of the liquid concentrate with a gallon of water to cover up to 1,000 sq ft; ideal to spray during cooler parts of the day when plant stomata are open.
- Reliable Organic Option: GS Plant Foods provides high-quality, cost-effective organic fertilizers designed to yield consistent results across various gardening scenarios.
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- OMRI Listed Organic Seaweed & Kelp Fertilizer: A natural liquid kelp fertilizer that enhances plant health by optimizing soil conditions and improving nutrient uptake without harmful chemicals.
- Natural Plant Food from Ascophyllum Nodosum: This seaweed extract boosts plants' tolerance to extreme conditions like heat and drought, enhancing chlorophyll levels for greener leaves and increased sugar content.
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#2
Value for Money
![Organic Plant Magic - Truly Organic™ Fast-Acting Water Soluble Plant Food - All-Purpose Fertilizer Concentrate for Flower, Vegetable, Herb, Fruit Tree, Garden & Indoor Houseplants [One 1/2 lb Bag]](https://m.media-amazon.com/images/I/510yaUo8LZL._SL320_.jpg)
![Organic Plant Magic - Truly Organic™ Fast-Acting Water Soluble Plant Food - All-Purpose Fertilizer Concentrate for Flower, Vegetable, Herb, Fruit Tree, Garden & Indoor Houseplants [One 1/2 lb Bag]](https://m.media-amazon.com/images/I/51w50Kmz3LL._SL320_.jpg)
![Organic Plant Magic - Truly Organic™ Fast-Acting Water Soluble Plant Food - All-Purpose Fertilizer Concentrate for Flower, Vegetable, Herb, Fruit Tree, Garden & Indoor Houseplants [One 1/2 lb Bag]](https://m.media-amazon.com/images/I/51Gia17blIL._SL320_.jpg)
![Organic Plant Magic - Truly Organic™ Fast-Acting Water Soluble Plant Food - All-Purpose Fertilizer Concentrate for Flower, Vegetable, Herb, Fruit Tree, Garden & Indoor Houseplants [One 1/2 lb Bag]](https://m.media-amazon.com/images/I/516I4JzQ3PL._SL320_.jpg)
![Organic Plant Magic - Truly Organic™ Fast-Acting Water Soluble Plant Food - All-Purpose Fertilizer Concentrate for Flower, Vegetable, Herb, Fruit Tree, Garden & Indoor Houseplants [One 1/2 lb Bag]](https://m.media-amazon.com/images/I/510yaUo8LZL._SL100_.jpg)
![Organic Plant Magic - Truly Organic™ Fast-Acting Water Soluble Plant Food - All-Purpose Fertilizer Concentrate for Flower, Vegetable, Herb, Fruit Tree, Garden & Indoor Houseplants [One 1/2 lb Bag]](https://m.media-amazon.com/images/I/51w50Kmz3LL._SL100_.jpg)
![Organic Plant Magic - Truly Organic™ Fast-Acting Water Soluble Plant Food - All-Purpose Fertilizer Concentrate for Flower, Vegetable, Herb, Fruit Tree, Garden & Indoor Houseplants [One 1/2 lb Bag]](https://m.media-amazon.com/images/I/51Gia17blIL._SL100_.jpg){kind=small}
![Organic Plant Magic - Truly Organic™ Fast-Acting Water Soluble Plant Food - All-Purpose Fertilizer Concentrate for Flower, Vegetable, Herb, Fruit Tree, Garden & Indoor Houseplants [One 1/2 lb Bag]](https://m.media-amazon.com/images/I/516I4JzQ3PL._SL100_.jpg){kind=small}
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- Updated packaging for the same trusted product favored by both gardeners and plants.
- Versatile and user-friendly; suitable for all types of plants and can be applied directly to seeds, soil, and existing plants or mixed with watering.
- A small amount is sufficient; a 1/2 lb bag can treat over 1,000 sq ft or yield over 32 gallons, enhancing soil health and providing continuous nutrition for plants.
- Promotes enhanced growth, vibrant colors, and improved flavors in plants, including flowers, fruits, vegetables, and herbs.
- Rich in essential nutrients and over 55 trace minerals; includes beneficial compounds like mycorrhizae to support natural plant growth.
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- Updated packaging for the same trusted product favored by both gardeners and plants.
- Versatile and user-friendly; suitable for all types of plants and can be applied directly to seeds, soil, and existing plants or mixed with watering.
- A small amount is sufficient; a 1/2 lb bag can treat over 1,000 sq ft or yield over 32 gallons, enhancing soil health and providing continuous nutrition for plants.
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#3
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- Organic plant nutrients suitable for a variety of plants including vegetables, herbs, flowers, and trees.
- Contains essential nutrients such as nitrogen, phosphorus, potassium, calcium, magnesium, and silica.
- Formulated with high-quality organic ingredients like fish emulsion, kelp, and mycorrhizae.
- Promotes healthier plant growth with improved flavor and aroma.
- Produced in the USA to meet quality and safety standards.
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- Organic plant nutrients suitable for a variety of plants including vegetables, herbs, flowers, and trees.
- Contains essential nutrients such as nitrogen, phosphorus, potassium, calcium, magnesium, and silica.
- Formulated with high-quality organic ingredients like fish emulsion, kelp, and mycorrhizae.
- Promotes healthier plant growth with improved flavor and aroma.
- Produced in the USA to meet quality and safety standards.
#4
14% Off
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- Organic plant food for healthy growth of fruits, vegetables, flowers, and herbs in various settings.
- Contains essential nutrients: 3% nitrogen, 2% phosphate, and 2% potash from natural sources like fish and kelp.
- User-friendly application: Mix 2 oz. per gallon of water, applying bi-weekly during the growing season for optimal plant health.
- Enhances soil quality and supports root development with a unique blend of natural ingredients.
- Safe for family and pets, made from organic components without harsh chemicals.
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- Organic plant food for healthy growth of fruits, vegetables, flowers, and herbs in various settings.
- Contains essential nutrients: 3% nitrogen, 2% phosphate, and 2% potash from natural sources like fish and kelp.
- User-friendly application: Mix 2 oz. per gallon of water, applying bi-weekly during the growing season for optimal plant health.
- Enhances soil quality and supports root development with a unique blend of natural ingredients.
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#5
10% Off
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- Suitable for both landscape and container plants, indoors and outdoors, including houseplants.
- Liquid concentrate features natural proteins, kelp extracts, and humic acids, with a balanced fertilizer analysis of 2-2-2.
- Recommended application every 2-4 weeks during the growing season, mixed with water as directed.
- Approved for organic gardening and registered as an Organic Input Material, meeting all organic production requirements.
- Produced by Espoma Company, a leader in natural organics since 1929.
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- Suitable for both landscape and container plants, indoors and outdoors, including houseplants.
- Liquid concentrate features natural proteins, kelp extracts, and humic acids, with a balanced fertilizer analysis of 2-2-2.
- Recommended application every 2-4 weeks during the growing season, mixed with water as directed.
- Approved for organic gardening and registered as an Organic Input Material, meeting all organic production requirements.
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#6
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- Organic plant food made from 94% plant-based ingredients for effective gardening
- Provides instant nourishment for healthier, more resilient plants
- Suitable for all plant types, including indoor and outdoor varieties
- Dilute with water as per label instructions for application; reapply every 7-14 days for outdoor plants, biweekly for indoor plants
- A 32 oz. container yields up to 10.75 gallons of diluted plant food
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- Organic plant food made from 94% plant-based ingredients for effective gardening
- Provides instant nourishment for healthier, more resilient plants
- Suitable for all plant types, including indoor and outdoor varieties
- Dilute with water as per label instructions for application; reapply every 7-14 days for outdoor plants, biweekly for indoor plants
- A 32 oz. container yields up to 10.75 gallons of diluted plant food
#7
16% Off
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- Contains marine phytoplankton, providing essential nutrients for all types of plants including vegetables, houseplants, and lawns.
- Rich in vitamins, minerals, essential fatty acids, amino acids, and phytochemicals that promote healthy plant growth.
- Organic and sustainably sourced, this fertilizer is safe for vegetable gardening and pets, with no GMOs or preservatives.
- High in key nutrients such as potassium, nitrogen, phosphorus, calcium, and magnesium for strong plant development.
- Convenient water-soluble formula; mix 1 part fertilizer with 20 parts water and apply every two weeks for best results.
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- Contains marine phytoplankton, providing essential nutrients for all types of plants including vegetables, houseplants, and lawns.
- Rich in vitamins, minerals, essential fatty acids, amino acids, and phytochemicals that promote healthy plant growth.
- Organic and sustainably sourced, this fertilizer is safe for vegetable gardening and pets, with no GMOs or preservatives.
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#8
12% Off
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- 16 oz liquid fertilizer suitable for organic gardening with an NPK ratio of 3-2-3 and CDFA, OMRI certification
- Application: Use every two weeks during the growing season, covering approximately 30 sq ft when diluted at 2 oz per gallon
- 100% organic and natural ingredients, exceeding industry standards for safety and pathogen testing, pet-friendly
- Manufactured in the USA, ensuring high-quality and ethically sourced organic fertilizers
- Contains premium organic content aimed at regenerating soil and supporting healthier fruit and vegetable production
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- 16 oz liquid fertilizer suitable for organic gardening with an NPK ratio of 3-2-3 and CDFA, OMRI certification
- Application: Use every two weeks during the growing season, covering approximately 30 sq ft when diluted at 2 oz per gallon
- 100% organic and natural ingredients, exceeding industry standards for safety and pathogen testing, pet-friendly
- Manufactured in the USA, ensuring high-quality and ethically sourced organic fertilizers
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#9
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- Balanced 10-10-10 formula providing equal parts Nitrogen, Phosphorus, and Potassium for optimal plant growth and health.
- Suitable for a variety of plants, including vegetables, lawns, houseplants, flowers, and shrubs, ensuring versatile application in any garden.
- Enriched with seaweed extract, offering micronutrients and growth hormones to enhance plant development and increase yield.
- Contains 6% Chelated Iron to support vibrant green foliage and combat chlorosis, effective across different soil pH levels without needing additional supplements.
- User-friendly liquid formula that easily mixes with water for convenient application, suitable for both beginners and experienced gardeners.
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- Balanced 10-10-10 formula providing equal parts Nitrogen, Phosphorus, and Potassium for optimal plant growth and health.
- Suitable for a variety of plants, including vegetables, lawns, houseplants, flowers, and shrubs, ensuring versatile application in any garden.
- Enriched with seaweed extract, offering micronutrients and growth hormones to enhance plant development and increase yield.
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#10
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- Seven species blend of organic seaweed and kelp including Ascophyllum Nodosum and Chlorella Vulgaris.
- Processed to retain natural enzymes, ensuring a clean kelp extract without fibrous pulp.
- Easy application for all plants; suitable for every stage of growth without risk of overuse.
- Applicable for houseplants, vegetable gardens, and lawns to promote healthy green growth.
- Developed in the USA by botanists and plant chemists using high-quality ingredients.
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- Seven species blend of organic seaweed and kelp including Ascophyllum Nodosum and Chlorella Vulgaris.
- Processed to retain natural enzymes, ensuring a clean kelp extract without fibrous pulp.
- Easy application for all plants; suitable for every stage of growth without risk of overuse.
- Applicable for houseplants, vegetable gardens, and lawns to promote healthy green growth.
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