10 Best Organic Lawn Fertilizers 2025 in the United States

The Organic Plant Magic - Truly Organic™ Slow Release Granular Lawn Fertilizer is designed to cater to various lawn types, including Bermuda and St. Augustine grass. It offers a truly organic solution enriched with amino and humic acids, beneficial biology, and complete nutrition, which are essential for healthy lawn growth.

Its slow-release granules ensure a sustained nutrient supply, promoting long-term soil and grass health without the risk of over-fertilization or burning the grass. The application method is straightforward with a user-friendly chart, and its granules are compatible with all spreaders, making it easy to apply. This 20-pound bag can cover up to 5,000 square feet, making it an economical choice for larger lawns.

Additionally, it's safe for kids, pets, and the environment, featuring non-toxic ingredients that contribute to environmental sustainability. This fertilizer is a robust option for those seeking an easy-to-use, environmentally friendly solution for maintaining a lush, healthy lawn.

Milorganite Recycled Lawn and Garden Nitrogen Fertilizer is an excellent choice for users looking for an organic lawn fertilizer option. One of the main strengths of Milorganite is its low-salt formula, which is gentle on plants, preventing dehydration and stress. This makes it suitable for a variety of climates and conditions, including peak heat periods. It's versatile enough for use on lawns, edible gardens, and houseplants, offering broad application possibilities.

The product is enriched with naturally occurring iron, contributing to a vibrant, green lawn without staining concrete or walkways, which is a significant advantage for maintaining aesthetics. With consistent nutrition lasting up to 10 weeks, Milorganite reduces the frequency of applications, which is convenient for users. Moreover, its even-release formula ensures uniform growth, helping achieve a lush and full lawn.

However, at a weight of 32 pounds, it might be cumbersome for some users to handle. The coverage area of 2500 square feet is decent, but users with larger lawns might need to buy multiple packages, which could be less cost-effective. The granule form is easy to apply, but it may require a spreader for even distribution, adding to the initial setup cost. Milorganite's use of recycled organic material aligns well with eco-friendly practices, though users should be aware of the potential variability in nutrient content typical of recycled products. Milorganite is a reliable, environmentally-friendly fertilizer that suits a range of gardening needs, though its weight and the potential need for additional equipment might be minor drawbacks for some users.

The Safer Brand 9335SR Lawn Restore Natural Lawn Fertilizer is designed to help you achieve a lush, green lawn by revitalizing and strengthening the root systems. With a 9-0-2 NPK ratio, it focuses heavily on nitrogen, which is great for promoting leaf growth and greening up the lawn. This fertilizer works quickly, showing results in as little as 3 to 5 days, and it is non-burning, meaning it won't harm your lawn even if over-applied.

This product ensures soil vitality and is safe for kids and pets to play on immediately after application, making it ideal for family homes. Additionally, it covers a large area, up to 5,000 square feet, which is beneficial for those with sizeable lawns. The granule form makes it easy to apply evenly with a spreader.

However, its 9-0-2 NPK ratio means it lacks phosphorus, which is essential for root development and plant health. This might not be ideal for new lawns or lawns that need more balanced nutrients. This fertilizer is particularly good for established lawns needing a quick boost of green and is safe for families, though it may not be the best choice for new lawns or those requiring a more balanced nutrient profile.