10 Best Fertilizer For Cannabis 2025 in the United States

The FoxFarm Fertilizer Soil Trio is a set of three liquid nutrients designed to promote healthy growth in cannabis and other plants. The trio includes Grow Big for vegetative growth, Tiger Bloom for flowering phases, and Big Bloom for overall plant health. These fertilizers are specifically formulated to work together, which can simplify the feeding process for growers.

One of the strengths of this product is its organic certification, making it suitable for those who prefer organic gardening methods. The nutrients are tailored to provide essential macro and micronutrients, ensuring that your plants receive balanced nourishment. The included Twin Canaries Conversion Chart is a helpful resource for users to understand optimal application rates, which can ease the learning curve for new growers.

On the downside, these liquid fertilizers require careful measuring and mixing, which may be daunting for beginners unfamiliar with fertilizer application. Additionally, while the organic nature of Big Bloom is a plus, it may not provide as rapid results as some synthetic options. The packaging, although compact at 1 pint per bottle, might also run out relatively quickly for larger operations, leading to more frequent purchases.

The FoxFarm Fertilizer Soil Trio is an excellent choice for cannabis growers looking for an organic solution that promotes robust growth and flowering. However, it may require more effort in application and consistent purchasing for those with extensive growing needs. This product suits both novice and experienced gardeners who appreciate quality nutrients in manageable quantities.

FoxFarm Big Bloom Plant Food is a liquid fertilizer designed for flowers, fruits, vegetables, and potted plants. This fertilizer is particularly notable for its organic composition, utilizing earthworm castings and bat guano to provide a rich array of nutrients. It has a very low NPK ratio of 0.01-0.03-0.7, which is beneficial for encouraging blooms without overwhelming the plants with high nitrogen levels. This can be especially suitable for cannabis cultivation, as it promotes robust flowering and root development, and enhances flavor and fragrance in herbs and fruits.

Additionally, the product is easy to apply by mixing with water, making it convenient for both indoor and outdoor use. The versatility allows it to be used regularly for a variety of plants, not just cannabis, which is great for gardeners who grow multiple types of plants. However, the low NPK ratio might not be ideal if you are looking for a strong growth boost, especially in the vegetative stage of cannabis.

The product's organic nature ensures no harmful chemicals are introduced, but it may require more frequent applications compared to synthetic fertilizers. In terms of micronutrients, the inclusion of high-test ingredients provides a well-rounded nutrient profile. FoxFarm Big Bloom Plant Food is a solid choice for those focusing on flowering stages and organic gardening practices.

The Trifecta Myco Supreme Plant Root Stimulator is a highly potent mycorrhizal fungi inoculant specifically designed to enhance root growth and soil health. Its standout feature is its ultra-concentrated formula, boasting 5,000 propagules per gram, which is significantly higher than most competitors. This high concentration translates to stronger and healthier plant roots, potentially leading to bigger yields. The product is organic, making it a good choice for those who prefer natural gardening solutions.

It is versatile and can be used in various growing systems including potting soil, hydroponics, and rockwool. The inoculant is both granular and water-soluble, offering flexibility in application methods, whether added directly to the roots or mixed with water for easier dispersion. Its high performance and ease of use make it a strong option for those looking to improve their plant's root systems naturally.

The product's compact size (2 fluid ounces) may be sufficient for small to moderate-scale growers, but larger operations might need more quantity to cover extensive growing areas.