9 Best Compost Accelerators 2025 in the United States

Dr. Connie's Compost Plus stands out with its all-natural and highly concentrated formulation, designed to speed up the composting process significantly. The blend of beneficial bacteria promotes oxygen and heat, helping to decompose garden matter and kitchen scraps quickly and efficiently. This product is versatile, suitable for both indoor and outdoor composting setups, including bins, tumblers, or simply compost piles.

A notable advantage is its ability to control odors, making it a practical choice for indoor composting where smell could be a concern. However, the product's strong concentration may require careful handling to avoid over-application. Additionally, while it is marketed as suitable for all types of composting, results may vary depending on the specific composting conditions and materials used.

The compact and lightweight packaging makes it easy to store and handle. Dr. Connie's Compost Plus is a great option for those seeking a natural solution to expedite their composting process and manage odors effectively in both outdoor and indoor environments.

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.

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.