10 Best Organic Lawn Fertilizers 2025 in the United States

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 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.

The Espoma Organic All Season Lawn Food 9-0-0 is a solid choice for those seeking a natural and organic fertilizer. It is designed to provide long-lasting nitrogen, promoting a deep green color in your lawn. The 9-0-0 N-P-K ratio means it focuses entirely on nitrogen without adding phosphorus or potassium, which suits those who want to avoid these nutrients. Its environmentally friendly formulation contains no toxic ingredients or sludges, making it safe for use around pets and children. Additionally, it's approved for organic gardening and crafted in the USA by a reputable company with a long history in natural organics.

This product is versatile, suitable for both cool and warm season grasses, including fescues, bluegrass, rye grass, St. Augustine, and zoysia. You can apply it using a drop or broadcast spreader both in early and late spring, and in the fall. A notable advantage is that it won’t burn your lawn or leach out of the soil, which is a common issue with some fertilizers.

However, one potential drawback is that it might not provide a balanced nutrient profile, as it only supplies nitrogen. If your lawn requires phosphorus or potassium, you might need to supplement with additional fertilizers. Additionally, since it covers up to 5,000 square feet per 28-pound bag, larger lawns may require multiple bags, which could be a consideration for budget-conscious consumers. The Espoma Organic All Season Lawn Food is particularly beneficial for those committed to organic gardening and looking for a safe, effective, and environmentally friendly way to maintain a healthy lawn.