Compost Tumbler vs. Worm Farming: Which is Better?

There seems to be an ongoing debate between the use of a compost tumbler or a worm farm for feeding the garden soil. Both of these are efficient solutions for recycling household waste and converting it into something useful, i.e. soil nutrients. Both are recommended methods for nourishing the soil bed in an organic way. The basic principle in both the systems is the same, i.e. organic matter is decomposed and converted into a nutrient-rich material, used for soil fertilization. However, when trying to choose between the two, you should be aware of the following:

Understanding Compost Tumbler

• A compost tumbler can be described as a cylindrical-shaped compost bin.
• It can be turned and twisted unlike conventional compost piles, offering greater ease-of-use.
• A typical composting bin would contain heaps of decaying garden foliage and kitchen waste, mixed thoroughly for encouraging microbial action.
• The growth of microorganisms is critical for composting, i.e. the process of natural decomposition.
• The nutrient-rich material produced in a compost tumbler is called compost or humus.

Worm Farming (Vermicomposting) Basics

• Worm Farms are a bit more elaborate in their arrangement. They use a tray system wherein different trays are laid over each other in a systematic manner.
• Typical worm farm would contain layers of worm food, rocks, soil and worm bedding. The trays can be removed, depending upon the decomposition level of the decomposing ingredients.
• The growth of worms is more critical than microbial activity.
• The nutrient-rich material is castings of the worms, i.e. worm defecation, also called humus.

Comparing Compost Tumbler, Worm Farming

1. Costs

• Compost tumblers are cheaper to procure and assemble. The only added expenditure is that of a retailed turning tumbler. This is needed because the tumbler needs to be perfectly perforated to ensure the right amount of air for aerobic, i.e. air-based, microbial action.
• Vermicomposting packages are much more expensive as most of them involve the use of temperature regulation systems and semi-automated moisture control settings.

2. Rate of Nutrient Formation

Compost tumblers tend to generate the nutrient-rich compost much quicker. The process of decomposition is not based on worm activity, i.e. it is based on the action of microorganisms that tend to multiply much faster.

3. Moisture Sensitivity

Microbial populations maintained within compost tumblers are less sensitive to moisture changes than worms used in worm farming. Even a few days of excess moisture can destroy a worm farm but not a compost assembly.

4. Daily Handling Needs

• Compost tumblers need little manual attention, since daily turning is not needed. However, in worm farming, the trays have to be regularly checked to assess the growth of worms.
• Piled-up worm castings tend to stunt the development of worms, i.e. the smallest collection of worm castings has to be removed.

5. Temperature Regulation

• Most worm farms need a temperature range that extends between 55 and 75 degrees. This is critical since worms die at the slightest of temperature changes and just won't survive below 38 degrees.
• This essentially means that if you plan to use a worm farm, you would have to insulate it during the drier and winter months.
• This does not apply to compost tumblers as they can be covered with sheets of plastic in colder conditions. Their temperature sensitivity is much lower.

6. Handling Needs

• Compost tumblers are easier to work with—being sturdy, they can be easily maneuvered. Different tumbler types can be purchased from the market and manipulated to suit your garden setting. Many retailed tumblers are assembled on wheels and they can be easily moved.
• Worm farms are intricate, fixed systems. If set-up with professional help, you would have to follow a set of instructions for maintaining a worm farm. There isn't much scope for manipulating a conventional worm farm to suit your yard space.

Compost tumblers are easier-to-maintain and are a more affordable solution for turning your yard and kitchen scrap into a useful soil-nutrient source. Worm farms are more effective as the dense humus has higher levels of nutrients but are more demanding to assemble and maintain. Worm farms are recommended if you plan to be a serious gardener and want to extend your garden bed substantially. For most conventional household gardening needs, compost tumblers make a more sensible and practical choice.