10 Best Outdoor Cannabis Fertilizer 2026 in the United States

The FoxFarm Fertilizer Soil Trio Liquid Nutrient kit includes three products: Grow Big, Big Bloom, and Tiger Bloom, each designed to support different stages of plant growth. This makes it a versatile option for outdoor cannabis growers. One of its strengths is its organic formulation, particularly Big Bloom, which is both OMRI Listed and registered as a CDFA Organic Input Material. This can be beneficial for those looking to grow organically.

The liquid form ensures easy application and quick absorption by plants, which is useful for seeing faster results. Additionally, the included Twin Canaries Conversion Chart helps users mix the nutrients accurately, which can be a great help for beginners. The pack's phosphorus-rich Tiger Bloom is particularly good for encouraging flower and bud development, which is crucial for cannabis plants.

This product is best suited for those who want an easy-to-use, organic option with a focus on both vegetative and flowering stages, although it may require additional slow-release nutrients for long-term feeding.

The Farmer’s Secret Fruit & Bloom Booster Fertilizer is designed to enhance flowering and yield across various plant types, including cannabis, making it a versatile option for outdoor gardeners. Its super concentrated formula means you only need a small amount (1 teaspoon per 2 gallons of water), which can be convenient and cost-effective over time.

This liquid fertilizer is easy to use—simply dilute with water and apply during regular watering intervals every 2-4 weeks. Made in the USA, it is trusted by many gardeners.

The VIVOSUN Liquid Nutrients Base A & B Bundle is a two-part liquid fertilizer designed to support all stages of plant growth, from vegetative to flowering, making it suitable for outdoor cannabis cultivation. It provides a balanced mix of essential macronutrients like nitrogen, phosphorus, potassium, calcium, and magnesium, along with important micronutrients, which helps prevent nutrient deficiencies commonly seen in cannabis plants.

This nutrient formula is synthetic and fully water soluble, allowing for quick nutrient availability and easy absorption by plants. It is compatible with various growing methods, including soil, hydroponics, aquaponics, and coco coir, offering flexibility for different growing setups. Additionally, it helps stabilize the pH level of the nutrient solution, an important factor for optimal nutrient uptake. A key convenience is that it requires only two bottles (Base A and Base B), simplifying feeding routines without complicated nutrient mixing plans.

The two parts must be diluted separately and never mixed in concentrated form to avoid nutrient lockout or chemical reactions. Although the product is not organic, its comprehensive nutrient profile and ease of use make it a solid choice for growers seeking reliable, consistent feeding for outdoor cannabis plants. Since it may lack slow-release properties, it is best applied regularly with watering to maintain nutrient levels.