10 Best Organic Lawn Fertilizer 2025 in the United States

The O.M. Scott & Sons Natural Grass Food is a notable option for those seeking an organic lawn fertilizer. One of its major strengths is the use of premium nutrient sources derived from nature, which supports healthy grass growth from the roots up. It's designed to provide continuous feeding for up to 10 weeks, which means less frequent application is needed, making it more convenient for busy homeowners. Additionally, it's safe for people and pets when used as directed, making it a family-friendly option.

This product is suitable for all grass types and covers up to 2,000 square feet, ensuring broad usability and efficiency. The packaging is also environmentally friendly, being recyclable which adds to its appeal for eco-conscious consumers. If you're looking for an organic fertilizer that is easy to use, environmentally friendly, and well-reviewed, this could be a good match for your lawn care needs.

Milorganite Recycled Lawn and Garden Nitrogen Fertilizer is a standout choice for those seeking an organic solution for their lawn and garden needs. Its low-salt formula protects plants from stress and ensures it's safe to use even during hot conditions. The nutrient source is primarily recycled organic material, which is excellent for the environment as it repurposes waste into a valuable product.

With the inclusion of naturally occurring iron, it helps lawns achieve a deep green color without staining nearby surfaces, which is a great bonus for maintaining the aesthetics of your garden paths or driveways. The granular form of this fertilizer makes it easy to apply evenly, aiding in consistent growth and reducing the risk of patchy areas. Each application lasts up to 10 weeks, meaning less frequent feedings and healthier soil over time.

However, one potential downside is the weight and size of the product, as the 32-pound bag might be cumbersome for some users to handle. Additionally, while it covers a substantial area of 2500 square feet, larger lawns may require multiple bags, potentially increasing costs. This fertilizer is well-suited for a variety of uses, including lawns, edible gardens, and houseplants, making it versatile for different gardening needs.

The Organic Plant Magic Truly Organic™ Slow Release Granular Lawn Fertilizer is a comprehensive option for anyone looking to nurture their lawn organically. One of its standout features is its balanced nutrient release thanks to its slow-release granules. The source of nutrients is highly commendable, containing amino and humic acids along with beneficial biology, which are key components for healthy grass growth. This makes it versatile for various types of grasses like Bermuda and St. Augustine, and useful across different seasons and regions.

The microbial content is another strong aspect, as it biologically increases the availability of air, water, and nutrients to the grass, enhancing its resilience and growth. In terms of environmental impact, this product is notably safe for kids, pets, and the environment, aligning with organic growing principles by avoiding toxic ingredients. Application is user-friendly, with a clear application chart and granules that flow evenly through spreaders, making it easy even for those new to lawn care.

A notable advantage is that it doesn’t burn the grass, reducing the risk of application errors. Its strong environmental credentials and ease of use make it a great choice for anyone aiming for an organic approach to lawn care.