10 Best Bloom Booster For Cannabis of 2025

Tested and Reviewed: Top 10 Bloom Booster For Cannabis deals with expert ratings from 8.1 to a perfect 10

July 2025 Edition

Editor's Choice

9.7

FoxFarm

FoxFarm - Big Bloom Plant Food, Liquid Fertilizer Concentrate for Flowers, Fruits, and Vegetables, All Purpose Plant Fertilizer for Indoor & Outdoor Potted Plants, NPK 0.01-0.03-0.7 (Pint)

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Editor's bottom line:

“This bloom booster for cannabis is the best one we tested. In terms of quality, brand and price, we couldn't ask for more.”

Main Highlights

Big Blooms Start with Big Bloom: Achieve vibrant, healthy blooms with our big bloom liquid plant food, specially formulated to provide your plants with essential nutrients for robust growth in flowers, fruits, and vegetables
Formula: Our liquid plant fertilizer delivers essential nutrients without harmful chemicals. Its unique micro-brewed formula includes earthworm castings, bat guano, & other high-test ingredients, ensuring a full range of nutrients
Strengthens Roots and Boosts Flavor: Our outdoor and fertilizer for vegetable garden enhances root development, intensifies flower fragrance & increases essential oil production, leading to stronger flavors in herbs, fruits & vegetables
Versatile Use: Our bloom fertilizer is ideal for all flowering and fruiting plants, including flowers, vegetables & herbs. Safe for regular use, it provides all the essential nutrients whether you're nurturing a garden or growing potted plant
Easy to Apply: This FoxFarm liquid fertilizer mixes effortlessly with water. Simply add the concentrate to your watering can and nourish your plants as you water. This convenient method ensures that your plants receive the nutrients without any hassle

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Picked by 339 people today

9.5

Advanced Nutrients

Advanced Nutrients GL525050-12 Big Bud Liquid Fertilizer, 250 mL.250 Liter, Brown/A

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Main Highlights

Larger, heavier, denser flowers
Flowers with more essential oils, aromatics, terpenoids, phenols and other potency factors
Measurable, significant increases in overall harvest weight and market value
No assembly required

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9.5

Greenleaf Nutrients

Bud Explosion PK Bloom Budding Fruiting Flowering Booster for Soil and Hydroponics

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Main Highlights

Mid to late harvest a potent blooming & budding PK enhancer.
Useful for all stages of flowering and fruiting
Maximize flowering sites and nodes for initial weeks of flowering.
More flower sites means bigger harvest and improved overall yields.
Fully compatible with all hydroponic, aeroponic and all other growing systems.

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9.2

Save 7%

Advanced Nutrients

Advanced Nutrients Big Bud - Bloom Booster - 500 mL

7% OffFree Shipping

Main Highlights

Big Bud 500mL

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9.0

FoxFarm

FoxFarm Tiger Bloom Liquid Fertilizer Concentrate - Fast Acting Formula for Vicious Growth with Phosphorus - Encourages Fruit, Flower & Bud Development, NPK 2-8-4 (Pint)

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Main Highlights

Use Tiger Bloom at the first sign of flowering
To extend flowering or fruiting; add Big Bloom liquid fertilizer late in the season
Formulated with a low pH to maintain stability in storage and keep micronutrients available
Use tiger bloom at the first sign of flowering

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8.8

Save 8%

FoxFarm

Fox Farm Beastie Bloomz Soluble Fertilizer - High-Phosphorus Fertilizer for Mid to Late Flowering, pH Balanced - Supports Blossom Development, NPK 0-5-3 (6 oz)

8% OffFree Shipping

Main Highlights

DRIVE LUSH BLOSSOM GROWTH: Beastie organic bloom booster fertilizer is specially formulated to support mid to late flowering, ensuring optimal blossom growth. Its nutrient-rich blend feeds plants exactly when needed, producing abundant flowers
PHOSPHORUS POWER FOR MAX YIELDS: Packed with extra phosphorus, Beastie Bloomz fertilizer for flowers ensures plants get the nutrition needed for faster growth and bigger yields, making it a perfectly balanced formula that doesn't leave a salty residue
HARVEST LUSH, FLAVOR-PACKED FRUITS: This powerful organic bloom fertilizer for flowers supports the production of juicy fruit, and essential oils which pump out from the stems and leaves, ensuring vibrant flavors and perfect textures for your harvest
EASY ADAPTATION FOR OPTIMAL RESULTS: Perfect for use in soilless mixes, soils, hydroponic, and aeroponic systems. This flower fertilizer outdoor bloom booster adapts to your preferred setup, making it an excellent choice for growers across different mediums
PROVEN PERFORMANCE SINCE 1984: Foxfarm fertilizer has delivered quality for decades, offering premium soils and nutrients designed with growers in mind. Greenhouse-tested formulas ensure consistent performance for every grower, every time

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Best Value

8.6

Save 27%

Element Nutrients

Bloom Booster and Yield Enhancer for Plants - Big, Heavy, Healthy Harvests, for Use in Soil and Hydroponics - Concentrated Phosphorus and Potassium - Flower Fuel 1-34-32, 250g

27% OffFree Shipping

Main Highlights

Flower Fuel is a 100% hydroponic-grade, soluble bloom fertilizer. It works great with any base nutrient (including all popular 2 and 3-part nutrients), and in any soil, coco, hydroponic or aeroponic system.
Formulated to achieve larger, denser and heavier harvests. That means better looking, more valuable crops for you.
Over 40 proprietary ingredients go into every jar of Flower Fuel. Among these are powerful nutrients, organic components, and every single trace element you need to grow healthy plants.
TREATS 200 GALLONS OF WATER! At 10 cents per gallon treated, Flower Fuel is an unbelievable value.

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8.3

General Hydroponics

General Hydroponics Liquid KoolBloom 0-10-10 - Concentrated Nutrient Additive, 1 qt

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Main Highlights

General Hydroponics Liquid KoolBloom 0-10-10 is a concentrated nutrient additive that promotes flowering and helps facilitate bulking and ripening in annual plants
Small amount of Liquid KoolBloom provides a significant amount of phosphorus and potassium
Enhances the production of essential oils and fragrance in many flowers, culinary, and medicinal herbs
Use throughout the entire flowering and ripening stage of plant life
General Hydroponics Liquid KoolBloom is for both hydroponic and soil applications

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8.1

Incredible Bulk

Organic Bloom Booster, Incredible Bulk 0.1-10-25. Organic Vegan Plant Food (1lb)

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Main Highlights

Unleash Explosive Blooms: Incredible Bulk bloom booster supercharges your plants with a powerful blend of organic ingredients rock phosphate, kelp, and sulfate of potash to maximize flowering, yield, and overall plant vitality.
Optimal Nutrient Delivery: Rock phosphate enriches your plants with phosphorus, essential for vigorous root development and abundant blooms, while kelp delivers vital micronutrients and essential elements for enhanced plant performance.
Potent Potassium Boost: Sulfate of potash provides a high concentration of potassium, improving nutrient uptake, strengthening cell walls, and promoting overall plant health for robust, thriving plants.
Eco-Friendly & Sustainable: Our Incredible Bulk formula is 100% organic, ensuring environmentally conscious gardening practices while delivering exceptional results for your flowers, fruits, and vegetables.
Versatile & Easy-to-Use: Ideal for a variety of plants, from fruits and vegetables to flowers and ornamentals, Incredible Bulk is perfect for both indoor and outdoor gardens. Simply follow the user-friendly instructions to experience remarkable growth and stunning blooms.

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Our Best Overall Choice

Best Choice

9.7

FoxFarm

FoxFarm - Big Bloom Plant Food, Liquid Fertilizer Concentrate for Flowers, Fruits, and Vegetables, All Purpose Plant Fertilizer for Indoor & Outdoor Potted Plants, NPK 0.01-0.03-0.7 (Pint)

Free Shipping

Editor's bottom line:

“This is the best one we tested. In terms of quality, brand and price, we couldn't ask for more.”

Main Highlights

Big Blooms Start with Big Bloom: Achieve vibrant, healthy blooms with our big bloom liquid plant food, specially formulated to provide your plants with essential nutrients for robust growth in flowers, fruits, and vegetables
Formula: Our liquid plant fertilizer delivers essential nutrients without harmful chemicals. Its unique micro-brewed formula includes earthworm castings, bat guano, & other high-test ingredients, ensuring a full range of nutrients
Strengthens Roots and Boosts Flavor: Our outdoor and fertilizer for vegetable garden enhances root development, intensifies flower fragrance & increases essential oil production, leading to stronger flavors in herbs, fruits & vegetables
Versatile Use: Our bloom fertilizer is ideal for all flowering and fruiting plants, including flowers, vegetables & herbs. Safe for regular use, it provides all the essential nutrients whether you're nurturing a garden or growing potted plant
Easy to Apply: This FoxFarm liquid fertilizer mixes effortlessly with water. Simply add the concentrate to your watering can and nourish your plants as you water. This convenient method ensures that your plants receive the nutrients without any hassle

Show Price

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