10 Best Organic Plant Fertilizers 2026 in the United States

Fox Farm Big Bloom Liquid Plant Food is an organic fertilizer designed primarily to support flowering and fruiting plants through all growth stages. Its very low NPK ratio (0-0.5-0.7) means it provides minimal nitrogen but a modest amount of phosphorus and potassium, nutrients important for blooms and fruit development. The fertilizer’s natural nutrient sources, including earthworm castings and bat guano, supply beneficial micronutrients and organic matter that improve soil health.

Miracle-Gro Shake 'N Feed Tomato, Fruit & Vegetable Plant Food is designed specifically for growing tomatoes, fruits, and vegetables, both in the ground and in containers. Its nutrient ratio of 10-5-15 (Nitrogen-Phosphorus-Potassium) indicates a higher potassium content, which supports fruit development and overall plant health. The fertilizer also includes calcium, which helps strengthen plant cell walls and can lead to better quality and longer-lasting produce.

The Osmocote Smart-Release Plant Food is a solid choice for gardeners looking to feed vegetables, flowers, and perennials with a balanced nutrient supply. It features a 14-14-14 NPK ratio, providing equal parts nitrogen, phosphorus, and potassium, which supports strong root growth and healthy leafy and flowering development. As a slow-release fertilizer, its nutrients are gradually made available based on soil temperature, helping to prevent nutrient burn and ensuring steady feeding over time. This makes it particularly user-friendly and somewhat mistake-proof, even if applied more heavily than recommended.