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10 Best Fertilizer For Marijuanas 2025 in the United States
#1
Winner
FoxFarm Fertilizer Soil Trio Liquid Nutrient: Tiger Bloom, Grow Big, Big Bloom Bottles - (Pack of 3-1 Pint)
The FoxFarm Fertilizer Soil Trio is a solid choice for those looking to enhance their marijuana plants. This trio includes Grow Big, Big Bloom, and Tiger Bloom, which are designed to work together to support healthy growth, flowering, and fruit production. The N-P-K ratios in these fertilizers cater to different growth stages, with Tiger Bloom focusing on phosphorus to boost flowering, while Grow Big supports vegetative growth. This balanced approach allows growers to provide targeted nutrition throughout the plants' life cycles.
Rating
10.0
Chosen by1,187
Organic vs. Synthetic
Ease of Use
Most important from
23220 reviews
#2
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)
FoxFarm's Big Bloom Plant Food is a liquid fertilizer with an N-P-K ratio of 0.01-0.03-0.7, which is quite low in nitrogen and phosphorus but has a higher potassium content. This makes it suitable for flowering and fruiting stages of marijuana growth. The product is organic, featuring ingredients like earthworm castings and bat guano, which can add a broad spectrum of micronutrients beneficial for healthy plant development.
Rating
10.0
N-P-K Ratio
Type of Fertilizer
Micronutrients
Most important from
10850 reviews
#3
General Hydroponics FloraSeries Hydroponic Nutrient Fertilizer System Trial Pack with FloraMicro, FloraBloom and FloraGro, 1 qt.
The General Hydroponics FloraSeries Hydroponic Nutrient Fertilizer System is designed specifically for hydroponic gardening, making it a solid choice for those growing marijuana plants. It consists of three formulas: FloraMicro, FloraBloom, and FloraGro, each catering to different growth stages. This nutrient system is praised for its N-P-K ratio, which supports healthy structural, foliar, and flowering growth, essential for cannabis cultivation. The inclusion of micronutrients ensures that plants receive all necessary elements for robust health, which is a big plus for growers aiming for a successful harvest.
Rating
9.8
pH Level
Ease of Use
Most important from
9090 reviews
Top 10 Best Fertilizer For Marijuanas 2025 in the United States
#1
Winner
10.0 score
FoxFarm Fertilizer Soil Trio Liquid Nutrient: Tiger Bloom, Grow Big, Big Bloom Bottles - (Pack of 3-1 Pint)
FoxFarm Fertilizer Soil Trio Liquid Nutrient: Tiger Bloom, Grow Big, Big Bloom Bottles - (Pack of 3-1 Pint)
N-P-K Ratio: Varies, Tiger Bloom focuses on phosphorus
Type of Fertilizer: Liquid
Organic vs. Synthetic: Organic, Big Bloom is OMRI Listed
Ease of Use: Easy to use, apply with watering
Chosen by 1187 this week
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)
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)
N-P-K Ratio: 0.01-0.03-0.7
Type of Fertilizer: Liquid
Organic vs. Synthetic: Organic
Micronutrients: earthworm castings, bat guano
Ease of Use: mixes easily with water
General Hydroponics FloraSeries Hydroponic Nutrient Fertilizer System Trial Pack with FloraMicro, FloraBloom and FloraGro, 1 qt.
General Hydroponics FloraSeries Hydroponic Nutrient Fertilizer System Trial Pack with FloraMicro, FloraBloom and FloraGro, 1 qt.
N-P-K Ratio: 1:1:1
Type of Fertilizer: Hydroponic Nutrient System
Micronutrients: Included
Ease of Use: Easy
Botanicare Organicare Bloom - Organic and Natural Granular Fertilizer for the Flowering Stage, 5 lbs.
Botanicare Organicare Bloom - Organic and Natural Granular Fertilizer for the Flowering Stage, 5 lbs.
Type of Fertilizer: Granules
Organic vs. Synthetic: Organic
Micronutrients: Calcium, Magnesium, Sulfur
Ease of Use: Easy to apply
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
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
Type of Fertilizer: Liquid
Micronutrients: Calcium, Magnesium
pH Level: pH-balanced
Ease of Use: 1:1 mixing ratio
Related Products
FoxFarm Grow Big Liquid Plant Food - Bloom Fertilizer for Flowers, Fruits, and Vegetables, Perfect for Indoor & Outdoor Potted Plants, NPK 6-4-4 (Pint)
FoxFarm Grow Big Liquid Plant Food - Bloom Fertilizer for Flowers, Fruits, and Vegetables, Perfect for Indoor & Outdoor Potted Plants, NPK 6-4-4 (Pint)
N-P-K Ratio: 6-4-4
Type of Fertilizer: Liquid
Organic vs. Synthetic: Organic
Micronutrients: Included
Ease of Use: Easy to mix and apply
FoxFarm Tiger Bloom Liquid Fertilizer Concentrate - Fast Acting Formula for Vicious Growth with Phosphorus - Encourages Fruit, Flower & Bud Development, NPK 2-8-4 (Pint)
FoxFarm Tiger Bloom Liquid Fertilizer Concentrate - Fast Acting Formula for Vicious Growth with Phosphorus - Encourages Fruit, Flower & Bud Development, NPK 2-8-4 (Pint)
N-P-K Ratio: 2-8-4
Type of Fertilizer: Liquid
Organic vs. Synthetic: Synthetic
Micronutrients: Available
pH Level: Low
Ease of Use: Careful mixing required
Back to the Roots Organic All-Purpose Plant Food (5 lb. Value Size), Premium Blend, Safe & Sustainable Vegan Formulation Made with Kelp and Alfaalfa Meal, Mycorrhize, and Rock Phosphate Minerals
Back to the Roots Organic All-Purpose Plant Food (5 lb. Value Size), Premium Blend, Safe & Sustainable Vegan Formulation Made with Kelp and Alfaalfa Meal, Mycorrhize, and Rock Phosphate Minerals
Type of Fertilizer: Powder
Organic vs. Synthetic: Organic
Ease of Use: 1 tbsp per gallon
Advanced Nutrients Grow Micro Bloom pH Perfect Bundle Set Combo Base Nutrient 1L
Advanced Nutrients Grow Micro Bloom pH Perfect Bundle Set Combo Base Nutrient 1L
N-P-K Ratio: balanced nutrients for growth
Type of Fertilizer: Liquid
Organic vs. Synthetic: Synthetic
Micronutrients: essential micronutrients
pH Level: optimal pH levels
Ease of Use: simplifies growing process
#10
7.9 score
General Hydroponics FloraNova Bloom, One-Part Nutrient, 1 Quart
General Hydroponics FloraNova Bloom, One-Part Nutrient, 1 Quart
N-P-K Ratio: 4-8-7
Type of Fertilizer: Liquid
Organic vs. Synthetic: Synthetic
Ease of Use: Straightforward mixing and feeding
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Buying Guide for the Best Fertilizer For Marijuanas
Choosing the right fertilizer for your marijuana plants is crucial for ensuring healthy growth and maximizing yield. Fertilizers provide essential nutrients that plants need to thrive, and different stages of growth require different nutrient compositions. Understanding the key specifications of fertilizers will help you make an informed decision and select the best product for your needs.N-P-K RatioThe N-P-K ratio represents the proportions of nitrogen (N), phosphorus (P), and potassium (K) in the fertilizer. These are the primary nutrients that plants need. Nitrogen is important for leaf growth, phosphorus for root and flower development, and potassium for overall plant health. During the vegetative stage, a higher nitrogen content (e.g., 3-1-2) is beneficial, while during the flowering stage, a higher phosphorus content (e.g., 1-3-2) is preferred. Choose a fertilizer with the appropriate N-P-K ratio based on the current growth stage of your plants.
Type of FertilizerFertilizers come in various forms, including liquid, granular, and slow-release. Liquid fertilizers are quickly absorbed and are ideal for immediate nutrient delivery, making them suitable for both vegetative and flowering stages. Granular fertilizers are sprinkled on the soil and provide nutrients over time, which can be useful for long-term feeding. Slow-release fertilizers gradually release nutrients over several months, reducing the need for frequent applications. Consider your growing setup and how often you want to fertilize when choosing the type of fertilizer.
Organic vs. SyntheticOrganic fertilizers are made from natural materials such as compost, manure, and bone meal, and they improve soil health over time. They release nutrients slowly and are less likely to cause nutrient burn. Synthetic fertilizers are chemically formulated and provide nutrients in a readily available form, which can lead to faster plant growth. However, they can also cause nutrient imbalances if not used correctly. If you prefer a more natural approach and are concerned about soil health, organic fertilizers are a good choice. If you need precise control over nutrient levels, synthetic fertilizers may be more suitable.
MicronutrientsIn addition to the primary nutrients (N-P-K), plants also need micronutrients such as calcium, magnesium, iron, and zinc in smaller amounts. These micronutrients are essential for various physiological functions and overall plant health. Some fertilizers include a complete range of micronutrients, while others may require you to supplement them separately. Ensure that your fertilizer provides a balanced mix of micronutrients to prevent deficiencies and promote optimal growth.
pH LevelThe pH level of the fertilizer affects the availability of nutrients to the plants. Marijuana plants prefer a slightly acidic pH range of 6.0 to 7.0 in soil and 5.5 to 6.5 in hydroponic systems. Some fertilizers are formulated to help maintain the desired pH level, while others may require you to adjust the pH separately. Regularly monitor the pH of your growing medium and choose a fertilizer that supports maintaining the optimal pH range for your plants.
Ease of UseConsider how easy the fertilizer is to use, including how it is applied and how often it needs to be administered. Some fertilizers come with clear instructions and pre-measured doses, making them user-friendly for beginners. Others may require more precise measurements and mixing. If you are new to growing marijuana or prefer a low-maintenance approach, look for a fertilizer that is straightforward to use and fits your routine.