10 Best Compost Fertilizers 2025 in the United States

Scotts Green Max Lawn Food is a versatile lawn fertilizer designed for various grass types and can be used during different seasons. Its dual-action formula includes an iron supplement, which helps achieve a deep green appearance within just three days. The product's high nutrient content, including 27% nitrogen, facilitates robust grass growth.

Additionally, the inclusion of 5% iron enhances the greening process, making it particularly effective for those looking to quickly improve the aesthetics of their lawn. The product is also designed to cover a large area of up to 10,000 sq. ft., making it suitable for extensive lawns. Another practical feature is that it does not stain concrete or other hard surfaces when applied as directed.

Scotts Green Max Lawn Food may not be the best fit for those specifically looking for compost-fertilizers rich in organic matter and beneficial microbes, as it primarily focuses on lawn aesthetics rather than soil health. The texture is granular, which might be less ideal for users looking for finer compost materials.

Brut Organic Worm Castings is a high-quality option for gardeners seeking to enhance plant growth with organic fertilizers. One of its significant strengths is the nutrient-rich content, ensuring your plants receive the necessary minerals for lush and vibrant growth. Additionally, being certified organic by OMRI and CDFA assures users of its purity and adherence to organic farming standards.

The castings are produced in-house from organic materials, raised indoors, guaranteeing a controlled and clean environment, which is beneficial in maintaining high-quality organic matter and nutrients. The family-owned brand, Brut Worm Farms, emphasizes care in production, which adds a personal touch to the product's credibility and reliability.

Brut Organic Worm Castings is a solid choice for those looking to naturally boost their garden's health, especially if they prioritize organic and family-produced products.

Wiggle Worm 100% Pure Organic Worm Castings Fertilizer is a solid choice for improving soil fertility and aeration. One of its main strengths is that it is composed entirely of pure earthworm castings, unlike many other products that mix castings with uneaten worm bedding. This ensures a nutrient-rich and mineral-dense fertilizer, which is beneficial for various plants, including houseplants, vegetables, and gardens. The tiny, football-shaped particles help enhance soil structure by improving aeration and the root's water retention capacity.

It's versatile and can be used both indoors and outdoors since it is odorless and non-toxic, making it a great option for a wide range of plants. Additionally, it's OMRI-listed for organic use, which speaks to its quality and adherence to organic standards. However, some users might find the need to apply it multiple times a year a bit inconvenient.

Also, while the product is generally easy to use, the 30-pound bag can be bulky and heavy to handle for some. If you are looking for an organic, nutrient-dense fertilizer that significantly boosts soil health, Wiggle Worm is a reliable option, though be prepared for its weight and the frequency of application.