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Outdoor Cannabis Fertilizer

10 Best Outdoor Cannabis Fertilizer 2025 in the United States

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Humboldts

Humboldts Secret

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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#1

Winner

FoxFarm Fe

FoxFarm

FoxFarm Fertilizer Soil Trio Liquid Nutrient: Tiger Bloom, Grow Big, Big Bloom Bottles - (Pack of 3-1 Pint)

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Humboldts

Humboldts Secret

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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#2
Farmer’s S

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

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#3
Humboldts

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

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#4
VIVOSUN Pl

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

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#5
Botanicare

Botanicare

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

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#6
Humboldts

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

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#7
GARDENWISE

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

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#8
Jack's Cla

Jack's Classic

Jack's Classic 10-30-20 Blossom Booster Water-Soluble Fertilizer with Micronutrients for Increasing Color and Quantity of Blooms in Flowering Plants, 1.5lbs

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#9
Bloom Boos

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

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#10
1L Gold Le

Gold Leaf

1L Gold Leaf Liquid Fertilizer Single-Step Plant Fertilizer with Every Essential Nutrient for Healthy Bigger Buds & Blooms, Optimized pH for Soil, Hydroponics, and Coco Growers

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