10 Best Garden Fertilizers 2026 in the United States

The Osmocote 15-9-12 fertilizer is a slow-release, synthetic granular product designed to feed plants steadily over 3 to 4 months. Its N-P-K ratio of 15-9-12 indicates balanced nutrition, with a good amount of nitrogen for leafy growth, phosphorus for roots and flowers, and potassium for overall plant health. The slow-release coating means nutrients are released gradually, reducing the need for frequent applications, which is convenient for gardeners who prefer low-maintenance feeding.

This fertilizer is water-soluble and comes in a 50-pound bag, making it suitable for larger gardens or lawns. The granular form allows for easy spreading, either by hand or with a spreader. It ranks well in customer reviews for effectiveness, though gardeners looking for organic options or targeted micronutrient blends might want to consider alternatives.

This product is ideal for those seeking a reliable, low-effort fertilizer to promote steady plant growth in common garden settings.

The Scotts Turf Builder Weed & Feed3 is a combination lawn fertilizer and weed killer designed for those who want to maintain a healthy, weed-free lawn. One of its main strengths is its dual functionality; it not only fertilizes the lawn but also controls more than 50 types of common weeds, including dandelions and clover. This makes it particularly suitable for homeowners dealing with persistent weed issues.

The product’s coverage of 5,000 sq. ft. is substantial, meaning it can handle medium to large lawns with ease. It is also compatible with various grass types like Bahiagrass, Bermudagrass, Bluegrass, Centipedegrass, Fescue, Ryegrass, and Zoysiagrass, which adds to its versatility. However, it's important to note that this product is not available in Florida, so residents there will need an alternative solution.

The application requires the lawn to be wet and the temperature to be between 60°F and 90°F, which may require some planning. Being a synthetic fertilizer, it might not appeal to those looking for an organic option. Scotts Turf Builder Weed & Feed3 is a reliable and effective choice for users who prioritize convenience and the dual action of weed control and fertilization.

Osmocote Smart-Release Plant Food Plus is a versatile fertilizer suitable for both indoor and outdoor plants, including those in containers and in-ground gardens. It contains 11 essential nutrients, ensuring comprehensive nourishment for a wide range of plant types. With an N-P-K ratio of 15-9-12, it provides a balanced mix of nitrogen, phosphorus, and potassium, promoting healthy growth and development.

One of its standout features is its gradual release formula, feeding plants for up to 6 months, which reduces the frequency of reapplication and maintenance effort. This product is easy to use; simply sprinkle the granules and mix them into the soil, then water regularly. An 8 lb. container can cover around 300 sq. ft., making it economical for larger gardens. Although it is a synthetic fertilizer, it is fortified with secondary nutrients beneficial for plant health.

Some users might prefer organic options, which this product is not. It works best when mixed into the top 1-3 inches of soil, which might be a bit of extra work for some. In summary, Osmocote Smart-Release Plant Food Plus is a reliable choice for gardeners looking for a long-lasting, comprehensive fertilizer for a variety of plants.