10 Best Organic Lawn Fertilizer 2025 in the United States

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.

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 Purely Organic Products Lawn Food 10-0-2 is a plant-based fertilizer that promotes lush, green turf grass without burning your lawn. One of its standout features is the absence of harsh chemicals, manure, and smelly biosolids, making it convenient and safe for families and pets. You won't need to worry about any restrictions on re-entry time after application, which is a great benefit if you have kids or pets that play on the lawn.

The 10-0-2 NPK ratio means it contains nitrogen and potassium but no phosphorus, aligning well with town and municipality regulations that restrict phosphate use. This also makes it suitable for environments where phosphate runoff is a concern. The nutrients are sourced from ingredients like distillers grains and soy, which are plant-based, adding to its eco-friendly appeal. However, it lacks microbial content, which some lawns might benefit from for improved soil health. The product comes in a 15-pound bag that covers up to 3,000 square feet, making it a good option for medium-sized lawns.

The granular form allows for easy application, although it might require a spreader for even distribution. While it may not provide the same level of root development and soil conditioning as some other fertilizers with added microbes, it's a strong choice for those looking for a straightforward, environmentally responsible lawn care solution.