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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 by1,202
Organic vs. Synthetic
Ease of Use
Most important from
23796 reviews
#2
Fox Farm Dirty Dozen Starter Kit - 9-Pack Liquid Nutrients & 3 Soluble Fertilizers - Includes Open Sesame, Beastie Bloomz & Cha Ching - Perfect for Thriving Plants & Vibrant Blooms
The Fox Farm Dirty Dozen Starter Kit is a comprehensive fertilizer package designed to enhance the growth and bloom of various plants. This kit includes 9 liquid nutrients and 3 soluble fertilizers, each aimed at different growth stages, making it a versatile solution for gardeners. The inclusion of well-known products like Open Sesame, Beastie Bloomz, and Cha Ching highlights its focus on boosting bloom and plant health.
Rating
9.1
Ease of Use
Most important from
1021 reviews
#3
CANNA Growing Nutrients Set
The CANNA Growing Nutrients Set is a liquid fertilizer kit designed to support various growth stages of marijuana plants, including root development, vegetative growth, and flowering. It combines several products like Canna Coco A + B, Rhizotonic, Cannazym, Boost, and PK 13/14, which together provide a balanced supply of essential nutrients. The inclusion of PK 13/14 indicates strong support for the flowering phase, which is crucial for producing large buds. This set is synthetic-based, offering precise nutrient control and easy absorption, but it may not appeal to those seeking fully organic options. The liquid form allows for flexible and straightforward mixing, though beginners might find mixing ratios challenging.
Rating
8.8
N-P-K Ratio
Organic vs. Synthetic
Ease of Use
Most important from
18 reviews
Top 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)
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 1202 this week
Fox Farm Dirty Dozen Starter Kit - 9-Pack Liquid Nutrients & 3 Soluble Fertilizers - Includes Open Sesame, Beastie Bloomz & Cha Ching - Perfect for Thriving Plants & Vibrant Blooms
Fox Farm Dirty Dozen Starter Kit - 9-Pack Liquid Nutrients & 3 Soluble Fertilizers - Includes Open Sesame, Beastie Bloomz & Cha Ching - Perfect for Thriving Plants & Vibrant Blooms
Type of Fertilizer: Liquid
Organic vs. Synthetic: Organic
Ease of Use: User-friendly
CANNA Growing Nutrients Set
CANNA Growing Nutrients Set
N-P-K Ratio: PK 13/14
Type of Fertilizer: Liquid fertilizer kit
Organic vs. Synthetic: Synthetic-based
Ease of Use: Flexible, straightforward mixing
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]
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]
Type of Fertilizer: Powder
Organic vs. Synthetic: Organic
Micronutrients: 55+ trace minerals and beneficial biology
Ease of Use: Water-soluble, mix and apply directly
FoxFarm Grow Big Liquid Plant Food - Bloom Fertilizer for Flowers, Fruits, and Vegetables, Perfect for Indoor & Outdoor Potted Plants, NPK 6-4-4 (Quart)
FoxFarm Grow Big Liquid Plant Food - Bloom Fertilizer for Flowers, Fruits, and Vegetables, Perfect for Indoor & Outdoor Potted Plants, NPK 6-4-4 (Quart)
N-P-K Ratio: 6-4-4
Type of Fertilizer: Liquid
Organic vs. Synthetic: Organic
Ease of Use: Mix 2-3 tsp per gallon
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Up to 9% off
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
FoxFarm - Big Bloom Plant Food, Liquid Fertilizer Concentrate for Flowers, Fruits, and Vegetables, All Purpose Plant Fertilizer for Indoor & Outdoor Potted Plants, NPK 0-0.5-0.7 (Pint)
FoxFarm - Big Bloom Plant Food, Liquid Fertilizer Concentrate for Flowers, Fruits, and Vegetables, All Purpose Plant Fertilizer for Indoor & Outdoor Potted Plants, NPK 0-0.5-0.7 (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
Technaflora TFSD20L Fertilizer, 20 Liter, Black
Technaflora TFSD20L Fertilizer, 20 Liter, Black
Type of Fertilizer: Liquid
Ease of Use: Easy to mix and apply
General Hydroponics FloraSeries Hydroponic Nutrient Fertilizer System with FloraMicro, FloraBloom and FloraGro, 1 gal.
General Hydroponics FloraSeries Hydroponic Nutrient Fertilizer System with FloraMicro, FloraBloom and FloraGro, 1 gal.
N-P-K Ratio: varies with mixing
Type of Fertilizer: liquid nutrient system
Organic vs. Synthetic: synthetic
Micronutrients: nitrogen, calcium, magnesium, sulfur
Ease of Use: needs careful measurement and knowledge
#10
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
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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.