Best Organic Fertilizer for Cannabis in 2025
Updated on June 2025
#1
Recommended
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- Liquid concentrate fertilizer that promotes lush vegetative growth.
- Organic liquid plant food suitable for all plants, usable with every watering.
- Phosphorus and nitrogen fertilizer that enhances fruit, flower, and bud development.
- Combination of Big Bloom, Grow Big, and Tiger Bloom for optimal plant growth and fruit yield.
- Conversion chart provided with every order for easy reference.
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- Liquid concentrate fertilizer that promotes lush vegetative growth.
- Organic liquid plant food suitable for all plants, usable with every watering.
- Phosphorus and nitrogen fertilizer that enhances fruit, flower, and bud development.
- Combination of Big Bloom, Grow Big, and Tiger Bloom for optimal plant growth and fruit yield.
- Conversion chart provided with every order for easy reference.
#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 fertilizer with a 7-3-1 nutrient formula, certified by OMRI for organic use
- High in available nitrogen and phosphorus, with one-third of nitrogen being water-soluble
- Supports robust vegetative growth and promotes early flowering and fruiting
- Quickly effective when mixed into potting soil, used as a side dressing, or brewed as guano tea
- Suitable for boosting plant growth during early and mid-season phases
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- Organic fertilizer with a 7-3-1 nutrient formula, certified by OMRI for organic use
- High in available nitrogen and phosphorus, with one-third of nitrogen being water-soluble
- Supports robust vegetative growth and promotes early flowering and fruiting
- Quickly effective when mixed into potting soil, used as a side dressing, or brewed as guano tea
- Suitable for boosting plant growth during early and mid-season phases
#4
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- Promotes vibrant blooms and healthy growth in flowers, fruits, and vegetables with essential nutrients.
- Micro-brewed liquid formula includes natural ingredients like earthworm castings and Norwegian kelp, providing a complete nutrient profile without harmful substances.
- Enhances root development and intensifies fragrance, improving flavor profiles in herbs, fruits, and vegetables.
- Suitable for all flowering and fruiting plants, this all-purpose fertilizer is safe for regular use in gardens and potted plants.
- Easily mixes with water for convenient application; simply add to watering can to nourish plants while watering.
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- Promotes vibrant blooms and healthy growth in flowers, fruits, and vegetables with essential nutrients.
- Micro-brewed liquid formula includes natural ingredients like earthworm castings and Norwegian kelp, providing a complete nutrient profile without harmful substances.
- Enhances root development and intensifies fragrance, improving flavor profiles in herbs, fruits, and vegetables.
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#5
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- Balanced NPK fertilizer (6-4-5) promotes healthy leaf and flower growth in indoor plants.
- Contains mycorrhizae and beneficial microbes to enhance root systems, improving nutrient and water absorption.
- Ready-to-use formula eliminates measuring and mixing, making application quick and easy for gardeners.
- A 4 lb bag covers up to 100 square feet, providing sustained nourishment for multiple indoor plants.
- Suitable for various gardening methods, this nutrient-rich fertilizer supports growth in containers, raised beds, and garden plots.
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- Balanced NPK fertilizer (6-4-5) promotes healthy leaf and flower growth in indoor plants.
- Contains mycorrhizae and beneficial microbes to enhance root systems, improving nutrient and water absorption.
- Ready-to-use formula eliminates measuring and mixing, making application quick and easy for gardeners.
- A 4 lb bag covers up to 100 square feet, providing sustained nourishment for multiple indoor plants.
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#6
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- blend of organic ingredients enhances flowering and yield
- rock phosphate provides essential phosphorus for root and bloom development
- kelp supplies vital micronutrients for plant performance
- sulfate of potash increases potassium levels for improved nutrient uptake and plant health
- 100% organic formula supports eco-friendly gardening
- suitable for a wide range of plants, ideal for indoor and outdoor use
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- blend of organic ingredients enhances flowering and yield
- rock phosphate provides essential phosphorus for root and bloom development
- kelp supplies vital micronutrients for plant performance
- sulfate of potash increases potassium levels for improved nutrient uptake and plant health
- 100% organic formula supports eco-friendly gardening
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#7
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- Specially formulated vegetable fertilizer promotes vegetative growth for healthier, larger plants.
- Enhances root development and increases essential oil production for improved flavor in herbs, fruits, and vegetables.
- Contains a unique micro-brewed formula with earthworm castings and Norwegian kelp, providing essential nutrients without harmful chemicals.
- Suitable for all flowering and fruiting plants, it supplies essential nutrients for a thriving garden or potted plants.
- Mixes easily with water for convenient application, ensuring efficient nutrient uptake while watering.
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- Specially formulated vegetable fertilizer promotes vegetative growth for healthier, larger plants.
- Enhances root development and increases essential oil production for improved flavor in herbs, fruits, and vegetables.
- Contains a unique micro-brewed formula with earthworm castings and Norwegian kelp, providing essential nutrients without harmful chemicals.
Read More
#8
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- Mix 5-10 ml of cal mag liquid fertilizer per gallon of water for standard plant care.
- Contains Calcium, Magnesium, zinc, iron, and essential micronutrients for optimal plant growth.
- Suitable for all indoor and outdoor plants, supporting growth for both novice and seasoned gardeners.
- Helps mitigate nutrient deficiencies that can lead to weak plant growth.
- Supports overall plant vitality and health, promoting lush growth.
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- Mix 5-10 ml of cal mag liquid fertilizer per gallon of water for standard plant care.
- Contains Calcium, Magnesium, zinc, iron, and essential micronutrients for optimal plant growth.
- Suitable for all indoor and outdoor plants, supporting growth for both novice and seasoned gardeners.
- Helps mitigate nutrient deficiencies that can lead to weak plant growth.
- Supports overall plant vitality and health, promoting lush growth.
#9
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- High-phosphorus and potassium formula enhances flowering and increases resin production.
- Suitable for a wide range of blooming plants, including fruits, vegetables, and flowers.
- Rapidly dissolves for quick absorption, ensuring immediate nutrient availability during flowering.
- Trusted by professionals for optimal bud development and superior terpene profiles.
- Compatible with various nutrient programs for seamless integration.
- Provides essential micronutrients for healthy transition from vegetative to flowering stages.
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- High-phosphorus and potassium formula enhances flowering and increases resin production.
- Suitable for a wide range of blooming plants, including fruits, vegetables, and flowers.
- Rapidly dissolves for quick absorption, ensuring immediate nutrient availability during flowering.
- Trusted by professionals for optimal bud development and superior terpene profiles.
- Compatible with various nutrient programs for seamless integration.
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#10
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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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