10 Best Fertilizers For Tomatoes 2025 in the United States

Burpee Organic Tomato & Vegetable Granular Plant Food is a solid choice for those looking to boost the growth of their tomatoes and other vegetables in an organic way. With its granular form, it is easy to apply and releases nutrients consistently over a period of up to 3 months, which means less frequent applications are needed. This can be particularly advantageous for busy gardeners. Its OMRI listing ensures that it meets organic standards, making it suitable for environmentally conscious users.

One possible drawback is the lack of specific information about the N-P-K ratio in the provided details, which is crucial for those wanting to tailor their fertilization to precise plant needs. Additionally, while it is designed to produce superior results throughout the season, the effectiveness can vary depending on the initial soil conditions and compatibility. Gardeners with highly specific soil pH requirements might need to conduct a soil test and adjust accordingly.

In summary, Burpee Organic Tomato & Vegetable Granular Plant Food is a long-lasting, easy-to-use fertilizer that is well suited for organic gardening, but users should ensure it meets their specific soil and nutrient needs.

FoxFarm Grow Big Liquid Plant Food offers a liquid fertilizer with an N-P-K ratio of 6-4-4, emphasizing nitrogen to support leafy, vegetative growth—a crucial stage for tomato plants before they fruit. This makes it a good choice during the early growing phase of tomatoes to encourage strong stems and leaves. The fertilizer blends organic elements like earthworm castings and Norwegian kelp, providing beneficial micronutrients and nutrients without harsh chemicals, appealing to gardeners who prefer more natural options.

It’s easy to use by mixing with water and applying directly, which simplifies feeding both indoor and outdoor potted tomatoes as well as garden plants. Its lower phosphorus (P) and potassium (K) levels may not fully support flowering and fruit development phases, so additional bloom or fruit-specific fertilizers might be needed later.

This fertilizer is well suited for tomato growers looking for organic-based support for healthy plant growth, especially during the vegetative stage, though supplementation may be required to meet all tomato feeding needs throughout the entire growth cycle.

General Hydroponics CALiMAGic is a liquid fertilizer specially designed to supply calcium and magnesium, two essential nutrients that tomatoes need to grow healthy and avoid common problems like blossom end rot and tip burn. It has an N-P-K ratio of 1-0-0, meaning it provides a small amount of nitrogen but no phosphorus or potassium, so it’s best used alongside a complete tomato fertilizer rather than on its own. This product is synthetic and highly soluble, making it easy to mix into hydroponic systems or soil without clogging drip lines or sprayers.

Its main strength is preventing calcium deficiency, which is a common cause of tomato fruit issues. However, since it doesn't contain phosphorus or potassium, it won’t support all stages of tomato growth by itself. Also, while it’s not specifically designed to adjust soil pH, it can be safely added to most growing environments. This fertilizer doesn’t provide micronutrients beyond calcium and magnesium, so you might need to supplement other minerals separately.

If you’re growing tomatoes hydroponically or in soil and want to avoid calcium-related problems, CALiMAGic is a solid choice to add to your feeding routine. Keep in mind it’s a specialized supplement rather than a full fertilizer solution.