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Outdoor Cannabis Fertilizer

10 Best Outdoor Cannabis Fertilizer 2025 in the United States

Name: FoxFarm Liquid Nutrient Trio Soil Formula: Big Bloom, Grow Big, Tiger Bloom (Pack of 3-16 oz Bottles) + Twin Canaries Chart
Brand: Twin Canaries Liquid Volume Conversion Chart
Price: 35.99 USD
Availability: InStock

From leading brands and best sellers available on the web.

Humboldts Secret Flower Stacker – Best Flowering Formula for Bigger Harvests - Flowering Plant Food – Nutrient System for Potting Soil for Indoor & Outdoor Plants - 2.5 Gallons

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Winner

Twin Canaries Liquid Volume Conversion Chart

FoxFarm Liquid Nutrient Trio Soil Formula: Big Bloom, Grow Big, Tiger Bloom (Pack of 3-16 oz Bottles) + Twin Canaries Chart

9.9

score

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Humboldts Secret Flower Stacker – Best Flowering Formula for Bigger Harvests - Flowering Plant Food – Nutrient System for Potting Soil for Indoor & Outdoor Plants - 2.5 Gallons

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Humboldts Secret

Editor’s Choice

Humboldts Secret Set of A & B Liquid Hydroponics Fertilizer - World's Best Nutrient System – Hydroponic Nutrients for Outdoor, Indoor Plants – Supports Vegetative and Flowering Stages of Plants

9.8

score

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Botanicare

Botanicare Organicare Bloom - Organic and Natural Granular Fertilizer for the Flowering Stage, 5 lbs.

9.6

score

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GARDENWISE

GARDENWISE 10-10-10 Fertilizer for All Purpose Plants - Liquid Fertilizer with Seaweed Kelp & Iron - Plant Food Outdoor & Indoor Plant Food, Vegetables, Flowers, Lawn & Garden 10 10 10 Fertilizer 8oz

9.3

score

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Humboldts Secret

Editor’s Choice

Humboldts Secret Starter Kit Pack – World's Best Indoor & Outdoor Plant Fertilizer and Nutrient System: Base A & B – Golden Tree – Flower Stacker – Plant Enzymes – CalMag & Iron

9.1

score

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Farmer's Secret

Farmer’s Secret Fruit & Bloom Booster Fertilizer (32oz) - Super Concentrated - Increases Flowering and Yield on All Varieties of Fruits, Vegetables and Flowers

8.8

score

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VIVOSUN

VIVOSUN Plant Food Nutrients Base A(4-0-1) & B(1-4-2) Bundle, All Purpose Liquid Fertilizer, Hydroponic Plant Food Supports Vegetative and Flowering Stages for Outdoor & Indoor Plants, Set of Quarts

8.6

score

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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

8.3

score

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Advanced Nutrients

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

8.0

score

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#10

Humboldts Secret

Editor’s Choice

Humboldts Secret Flower Stacker – Best Flowering Formula for Bigger Harvests - Flowering Plant Food – Nutrient System for Potting Soil for Indoor Plants & Outdoor Plants - 8 Ounce

7.7

score

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More products we considered

Humboldts Secret Set of A & B Liquid Hydroponics Fertilizer - World's Best Nutrient System – Hydroponic Nutrients for Outdoor, Indoor Plants – Supports Vegetative and Flowering Stages of Plants

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Arber Nutrition & Health Starter Set - Organic Plant Nourishment, Protection & Growth Boost - Liquid Concentrate for Gardens (Organic Nutrition & Health Set)

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GS Plant Foods Seaweed Fertilizer - Omri Organic Liquid Kelp Seaweed Fertilizer (275 Gallon) - Liquid Kelp & Seaweed Concentrate for Farms, Gardens, Greenhouses, Lawns & Soil

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𝐏𝐑𝐎𝐅𝐄𝐒𝐒𝐈𝐎𝐍𝐀𝐋 All-Purpose 20-20-20 Liquid Fertilizer Spray for Lawns, Grass, Plants, Vegetables, Fruits & Flowers | 20-20-20 Liquid Fertilizer for Indoor and Outdoor Plants (32 OZ)

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Omri Listed Fish & Kelp Fertilizer for Plants

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How do we rank products for you?

Our technology thoroughly searches through the online shopping world, reviewing hundreds of sites. We then process and analyze this information, updating in real-time to bring you the latest top-rated products. This way, you always get the best and most current options available.

10 Best Outdoor Cannabis Fertilizer 2025 in the United States

Humboldts Secret Flower Stacker – Best Flowering Formula for Bigger Harvests - Flowering Plant Food – Nutrient System for Potting Soil for Indoor & Outdoor Plants - 2.5 Gallons

FoxFarm Liquid Nutrient Trio Soil Formula: Big Bloom, Grow Big, Tiger Bloom (Pack of 3-16 oz Bottles) + Twin Canaries Chart

Humboldts Secret Flower Stacker – Best Flowering Formula for Bigger Harvests - Flowering Plant Food – Nutrient System for Potting Soil for Indoor & Outdoor Plants - 2.5 Gallons

Humboldts Secret Set of A & B Liquid Hydroponics Fertilizer - World's Best Nutrient System – Hydroponic Nutrients for Outdoor, Indoor Plants – Supports Vegetative and Flowering Stages of Plants

Botanicare Organicare Bloom - Organic and Natural Granular Fertilizer for the Flowering Stage, 5 lbs.

GARDENWISE 10-10-10 Fertilizer for All Purpose Plants - Liquid Fertilizer with Seaweed Kelp & Iron - Plant Food Outdoor & Indoor Plant Food, Vegetables, Flowers, Lawn & Garden 10 10 10 Fertilizer 8oz

Humboldts Secret Starter Kit Pack – World's Best Indoor & Outdoor Plant Fertilizer and Nutrient System: Base A & B – Golden Tree – Flower Stacker – Plant Enzymes – CalMag & Iron

Farmer’s Secret Fruit & Bloom Booster Fertilizer (32oz) - Super Concentrated - Increases Flowering and Yield on All Varieties of Fruits, Vegetables and Flowers

VIVOSUN Plant Food Nutrients Base A(4-0-1) & B(1-4-2) Bundle, All Purpose Liquid Fertilizer, Hydroponic Plant Food Supports Vegetative and Flowering Stages for Outdoor & Indoor Plants, Set of Quarts

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

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

Humboldts Secret Flower Stacker – Best Flowering Formula for Bigger Harvests - Flowering Plant Food – Nutrient System for Potting Soil for Indoor Plants & Outdoor Plants - 8 Ounce

Humboldts Secret Set of A & B Liquid Hydroponics Fertilizer - World's Best Nutrient System – Hydroponic Nutrients for Outdoor, Indoor Plants – Supports Vegetative and Flowering Stages of Plants

Arber Nutrition & Health Starter Set - Organic Plant Nourishment, Protection & Growth Boost - Liquid Concentrate for Gardens (Organic Nutrition & Health Set)

GS Plant Foods Seaweed Fertilizer - Omri Organic Liquid Kelp Seaweed Fertilizer (275 Gallon) - Liquid Kelp & Seaweed Concentrate for Farms, Gardens, Greenhouses, Lawns & Soil

𝐏𝐑𝐎𝐅𝐄𝐒𝐒𝐈𝐎𝐍𝐀𝐋 All-Purpose 20-20-20 Liquid Fertilizer Spray for Lawns, Grass, Plants, Vegetables, Fruits & Flowers | 20-20-20 Liquid Fertilizer for Indoor and Outdoor Plants (32 OZ)

Omri Listed Fish & Kelp Fertilizer for Plants

FAQ

What is the best fertilizer for outdoor cannabis?

How often should I fertilize my outdoor cannabis plants?

Can I use organic fertilizers for outdoor cannabis?

What are the signs of nutrient deficiency in cannabis plants?

How do I avoid over-fertilizing my outdoor cannabis plants?

10 Best Outdoor Cannabis Fertilizer 2025 in the United States

Humboldts Secret Flower Stacker – Best Flowering Formula for Bigger Harvests - Flowering Plant Food – Nutrient System for Potting Soil for Indoor & Outdoor Plants - 2.5 Gallons

FoxFarm Liquid Nutrient Trio Soil Formula: Big Bloom, Grow Big, Tiger Bloom (Pack of 3-16 oz Bottles) + Twin Canaries Chart

Humboldts Secret Flower Stacker – Best Flowering Formula for Bigger Harvests - Flowering Plant Food – Nutrient System for Potting Soil for Indoor & Outdoor Plants - 2.5 Gallons

Humboldts Secret Set of A & B Liquid Hydroponics Fertilizer - World's Best Nutrient System – Hydroponic Nutrients for Outdoor, Indoor Plants – Supports Vegetative and Flowering Stages of Plants

Botanicare Organicare Bloom - Organic and Natural Granular Fertilizer for the Flowering Stage, 5 lbs.

GARDENWISE 10-10-10 Fertilizer for All Purpose Plants - Liquid Fertilizer with Seaweed Kelp & Iron - Plant Food Outdoor & Indoor Plant Food, Vegetables, Flowers, Lawn & Garden 10 10 10 Fertilizer 8oz

Humboldts Secret Starter Kit Pack – World's Best Indoor & Outdoor Plant Fertilizer and Nutrient System: Base A & B – Golden Tree – Flower Stacker – Plant Enzymes – CalMag & Iron

100 Earthpods - Premium Bio Organic Vegetable Fertilizer Spikes – Special Formulated Herb Fertilizer for Potted Plants - Organic Plant Food for Herbs - Garden Fertilizer Sticks – Made in USA

𝐁𝐄𝐒𝐓𝐒𝐄𝐋𝐋𝐄𝐑 Plant Superfood for PHILODENDRON Plants with B1 Vitamin, Glucose and Essential Minerals - Organic Plant Food Fertilizer for Indoor & Outdoor PHILODENDRON Plant Care - 8oz

Humboldts Secret Sweet & Sticky – Carbohydrate and Saccharide Energy Source – Enhance Aroma and Flavor of Plants – Potting Soil for Indoor Plants – Energy for Plants – 8 Ounce

Organic Liquid Humic Acid (55 Gallon)

Omri Listed Fish & Kelp Fertilizer for Plants (55 Gallon) - Organic Fertilizer for Vegetables, Trees, Lawns, Shrubs, Flowers, Seeds & Plants - Hydrolyzed Fish and Seaweed Blend

Farmer’s Secret Fruit & Bloom Booster Fertilizer (32oz) - Super Concentrated - Increases Flowering and Yield on All Varieties of Fruits, Vegetables and Flowers

VIVOSUN Plant Food Nutrients Base A(4-0-1) & B(1-4-2) Bundle, All Purpose Liquid Fertilizer, Hydroponic Plant Food Supports Vegetative and Flowering Stages for Outdoor & Indoor Plants, Set of Quarts

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

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

Humboldts Secret Flower Stacker – Best Flowering Formula for Bigger Harvests - Flowering Plant Food – Nutrient System for Potting Soil for Indoor Plants & Outdoor Plants - 8 Ounce

Organic Fertilizer For Corns

Fertilizer For Orchids

BAYER fertilizer

Fertilizers

Organic Indoor Plant Fertilizer

Humboldts Secret Set of A & B Liquid Hydroponics Fertilizer - World's Best Nutrient System – Hydroponic Nutrients for Outdoor, Indoor Plants – Supports Vegetative and Flowering Stages of Plants

Arber Nutrition & Health Starter Set - Organic Plant Nourishment, Protection & Growth Boost - Liquid Concentrate for Gardens (Organic Nutrition & Health Set)

GS Plant Foods Seaweed Fertilizer - Omri Organic Liquid Kelp Seaweed Fertilizer (275 Gallon) - Liquid Kelp & Seaweed Concentrate for Farms, Gardens, Greenhouses, Lawns & Soil

𝐏𝐑𝐎𝐅𝐄𝐒𝐒𝐈𝐎𝐍𝐀𝐋 All-Purpose 20-20-20 Liquid Fertilizer Spray for Lawns, Grass, Plants, Vegetables, Fruits & Flowers | 20-20-20 Liquid Fertilizer for Indoor and Outdoor Plants (32 OZ)

Omri Listed Fish & Kelp Fertilizer for Plants

FAQ

What is the best fertilizer for outdoor cannabis?

How often should I fertilize my outdoor cannabis plants?

Can I use organic fertilizers for outdoor cannabis?

What are the signs of nutrient deficiency in cannabis plants?

How do I avoid over-fertilizing my outdoor cannabis plants?