8 Best Compost Accelerators 2025 in the United States

The TeraGanix Compost Accelerator is a liquid compost starter concentrate designed to boost microbial activity in soil, which helps convert organic materials into nutrient-rich humus more quickly than traditional composting methods. One notable strength is its ability to reduce unwanted odors typically associated with composting, thanks to its blend of Effective Microorganisms (EM-1) that promote fermentation rather than decomposition. This product is USDA Organic certified, meaning it's free from synthetic chemicals, making it suitable for environmentally conscious users.

The application method is straightforward: simply mix three tablespoons with a gallon of water and apply to compost material using a watering can or sprayer. The concentrate's capacity to make 22 gallons from one quart ensures good value for money. However, some users might find it less convenient compared to ready-to-use products. The composting time is significantly reduced, though the exact duration can vary based on conditions like temperature and compost material.

The product dimensions and weight are manageable, making it easy to store and handle. With a Best Sellers Rank of #1,132 in Garden Fertilizers, it is clear that many users are satisfied with its performance. Nevertheless, it may not be the best option for those looking for immediate results without the need for additional preparation and mixing.

Jobe’s Organics Compost Starter 4-4-2 Organic Gardening Compost Accelerator is designed to help speed up the composting process effectively. This product is made from organic ingredients, which is a plus for those looking to maintain an eco-friendly garden. It comes in granular form, making it easy to mix into your compost pile. The application method is straightforward, simply scatter the granules and mix them into your compost materials.

This product is ideal for medium coverage areas, which should be ample for most home garden composting needs. With an organic certification, it assures users that no harmful chemicals are added, safe for organic gardening practices. The composting time is reduced significantly with this accelerator, helping to produce rich, nutrient-dense compost faster than usual. It works within a broad temperature range, making it suitable for various climates and seasons.

On the downside, the 4-pound bag might not be sufficient for larger composting needs without frequent re-purchases. This compost accelerator is best suited for eco-conscious gardeners who want to enhance their composting process efficiently while ensuring they are using a certified organic product.

The GREEN PIG Compost Accelerator is designed to efficiently transform yard waste into fertile humus within 30 days, making it ideal for gardeners looking to improve their composting process quickly. This product contains beneficial bacteria cultures that speed up the natural composting process, and it comes in convenient dissolvable packets, each of which treats 9 cubic feet of compost.

This ease of application is a definite strength, especially for individuals who may be new to composting or prefer a straightforward method. Additionally, the product helps control odors associated with compost piles, which is a significant benefit for users concerned about smells in their gardens or homes.

The product is compact and lightweight, making storage and handling relatively easy. Its popularity and high ranking in outdoor composting bins suggest it is a well-regarded option in its category. The GREEN PIG Compost Accelerator is a user-friendly and effective product for gardeners looking to accelerate their composting process.