10 Best Fertilizer For Marijuanas 2025 in the United States

FoxFarm Tiger Bloom Liquid Fertilizer Concentrate is specifically designed for promoting the flowering and budding stages of marijuana growth. With an N-P-K ratio of 2-8-4, it is rich in phosphorus, which is essential for flowering. One of its main strengths is its fast-acting formula, which means you can expect quick results in terms of flower and bud development.

The low pH formulation helps maintain stability and availability of micronutrients, ensuring your plants get the necessary elements they need. It's also versatile, suitable for soil and hydroponic growing setups. However, one drawback is that being a liquid concentrate, it requires careful mixing (1 part fertilizer to 200 or 300 parts water) to avoid over-fertilization. This might be a bit tricky for beginners.

Additionally, while it's a synthetic fertilizer, it may not appeal to those strictly looking for organic solutions. Ease of use could be another concern, as it needs to be applied at the first sign of flowering and then supplemented with another product like Big Bloom later on.

The FoxFarm Grow Big Liquid Plant Food is a versatile fertilizer suitable for a variety of plants, including marijuana. It features an N-P-K ratio of 6-4-4, which is beneficial for vegetative growth, supporting the development of healthy and robust plants. The fertilizer's unique blend includes organic components such as earthworm castings and Norwegian kelp, which provide essential nutrients without harmful chemicals, promoting stronger roots and better flavor in fruits, flowers, and vegetables.

It is easy to use by mixing 2-3 teaspoons per gallon of water, making the feeding process straightforward and hassle-free. With a significant user rating of 4.8 out of 5 stars from over 7,000 reviews, it is well-received by the gardening community. However, it is important to note that while it is marketed as suitable for all flowering and fruiting plants, users should monitor pH levels to ensure optimal nutrient uptake. Additionally, its liquid form may require careful handling and storage to avoid spills.

Given its comprehensive nutrient profile and ease of use, it is a strong choice for both novice and experienced growers looking to enhance plant growth and yield.

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.

It is designed to enhance root strength, improve flower fragrance, and boost essential oil production, which can be particularly useful for increasing the potency of marijuana plants. The fertilizer is safe for regular use on all types of flowering and fruiting plants, including marijuana. It comes in a liquid form that mixes easily with water, simplifying the application process.

Its low N-P-K ratio might not be sufficient for the vegetative stage when marijuana plants require higher levels of nitrogen and phosphorus for vigorous growth. Additionally, while it offers a comprehensive range of nutrients, users looking for a highly targeted fertilization approach may need to supplement it with additional products. This fertilizer is best suited for enhancing the bloom phase and should be paired with other products during the vegetative stage to meet all nutritional needs.