10 Best Tomato Fertilizers 2026 in the United States

Neptune’s Harvest Organic Tomato & Vegetable Plant Fertilizer is a liquid, organic fertilizer designed specifically for tomatoes and other vegetables. It has an NPK ratio of 2-4-2, meaning it provides more phosphorus relative to nitrogen and potassium, which supports strong root and fruit development—key for healthy tomato plants. Being organic, it combines natural ingredients like fish, seaweed, molasses, and yucca extract, along with beneficial microbes and humic acids. These ingredients not only supply essential nutrients but also improve soil health by enhancing nutrient uptake and moisture retention. The liquid form makes it easy to apply either as a foliar spray or directly to the soil. For outdoor plants, feeding every 1-2 weeks is recommended, while houseplants benefit from weekly applications. This frequency supports steady growth without overwhelming plants.

A notable strength is its ability to boost plant resilience against stress factors like drought and disease, making it great for gardeners looking for a natural option that promotes both plant and soil vitality. One downside is the lower nitrogen level (2), which might slow leafy growth if used alone on plants needing more nitrogen; supplementing with a nitrogen-rich fertilizer could help in that case. Also, since it’s a liquid fertilizer, repeated applications are necessary compared to slower-release granular types. This fertilizer is especially beneficial for organic gardeners and those wanting to support healthy tomato and vegetable growth through an environmentally friendly product that improves soil as well as plants.

Burpee Organic Tomato & Vegetable Granular Plant Food is a well-regarded choice for gardeners looking for an organic fertilizer. It comes in a 4-pound package and is easy to apply, providing long-lasting results by releasing nutrients over a period of up to 3 months. This makes it convenient for those who prefer not to fertilize frequently. The product is OMRI listed, ensuring it is suitable for organic gardening practices.

The fertilizer supports robust growth and healthy plants by supplying essential nutrients continuously throughout the growing season. It is well-suited for tomatoes and other vegetables, but may not be the best choice for those seeking a synthetic fertilizer with immediate, intense nutrient delivery. Burpee's long-standing reputation and commitment to quality make this a reliable option for organic gardeners aiming for superior yield and plant health.

Miracle-Gro Shake 'N Feed Tomato, Fruit and Vegetable Plant Food is a slow-release fertilizer designed to feed your plants for up to three months. Its NPK ratio is about 1:0:0, which means it mainly provides nitrogen to promote leafy growth, but it lacks significant phosphorus and potassium, which are also important for fruit development and root health. However, it does contain calcium, which can help prevent common issues like blossom end rot in tomatoes, supporting stronger and longer-lasting fruits.

This product is a synthetic granular fertilizer that is easy to apply either to garden soil or container plants. It’s designed for use on tomatoes, fruits, and vegetables, making it a versatile choice for many gardeners. One of its strengths is the convenience of feeding plants over a full season with only one application every three months. This can save time compared to more frequent feeding schedules.

While it helps with general plant nutrition, it may not fully meet the needs of tomato plants that require a balanced mix of nutrients, especially if your soil is lacking phosphorus or potassium. Also, since it is synthetic, those looking specifically for organic options might prefer different products. This fertilizer is a straightforward, low-maintenance feeding option that supports healthy leafy growth and improves fruit quality through calcium. For best results, pairing it with soil tests or supplements rich in other nutrients can help ensure your tomatoes get everything they need.