Worm Farm vs Compost Bin: Which is Right for You?
Both worm farms and compost bins convert organic waste into valuable soil amendments — but they work in very different ways, suit different living situations, and produce different outputs. If you’re trying to decide which to start with, this guide will help you make the right call.
How each system works
Compost bin
A traditional compost bin (or pile) uses aerobic decomposition — billions of microorganisms (bacteria, fungi, and other soil life) break down organic material in the presence of oxygen. The process generates heat, which accelerates breakdown and can kill weed seeds and pathogens if managed correctly. Output: dark, crumbly compost ready to use in the garden.
Worm farm (vermicomposting)
A worm farm uses composting worms (red wrigglers) to convert food scraps into castings through digestion. The process is cooler than composting, produces two outputs (castings and liquid), and works at smaller scale. Output: highly concentrated worm castings and liquid fertiliser.
Head-to-head comparison
| Factor | Compost Bin | Worm Farm |
|---|---|---|
| Space required | Needs garden or outdoor area | Bench, balcony, or cupboard |
| Best for | Large volumes of mixed organic waste | Kitchen scraps and food waste |
| Accepts garden waste | Yes | Limited (no woody material) |
| Accepts meat and dairy | No (open bins) | No |
| Processing speed | 8 weeks–2 years (varies) | Continuous/ongoing |
| Output | Bulk compost for garden | Concentrated castings + liquid |
| Maintenance | Weekly turning recommended | Feed every 2–3 days |
| Cost | Low ($0 DIY to ~$100 for bin) | $50–$250 for kit |
| Pest risk | Moderate (open bins) | Very low (enclosed) |
| Odour | Low if balanced | Very low if managed correctly |
| Suitable for apartments | No (unless tumbler) | Yes |
When to choose a compost bin
- You have a garden and generate significant amounts of garden waste (lawn clippings, prunings, leaves)
- You want to process large volumes of organic material at once
- You have outdoor space to dedicate to a bin or pile
- You want to produce bulk compost for garden beds
- You’re comfortable with a longer processing time
Not sure what belongs in your compost? Check out our What Can You Compost? A Complete Australian Guide for a clear, practical breakdown of what to include (and what to avoid).
When to choose a worm farm
- You live in an apartment or have no outdoor space
- Your waste stream is primarily kitchen food scraps
- You want a compact, year-round system
- You have pot plants or a small garden that would benefit from liquid fertiliser
- You want a composting system suitable for children to observe and participate in
Check out our 6 Tips to Starting a Worm Farm for simple, practical advice to get you set up and thriving.
Using both: the power duo
Many experienced composters use both systems together: the worm farm handles food scraps year-round, while the compost bin handles garden waste, cardboard, and larger volumes. The worm castings can also be added to the compost bin to accelerate decomposition.
Which produces better compost?
Both produce excellent outputs, but they’re different products:
- Worm castings are highly concentrated and rich in plant-available nutrients, beneficial microbes, and growth hormones. Best used as a top dressing or potting mix additive — a little goes a long way.
- Compost is less concentrated but better suited for bulk soil improvement, mulching, and conditioning large garden beds.
Looking to reduce your waste, live more sustainably, and finally understand composting? Check out our comprehensive e-book, which has everything you need to know here.
Frequently Asked Questions
Can you put worm castings in a compost bin?
Yes — and it’s actually beneficial. Worm castings are rich in beneficial microorganisms that can accelerate decomposition in your compost bin.
Can composting worms survive in a standard compost bin?
Generally not well. Standard compost bins can get too hot, too dry, and the material is too coarse for red wrigglers, which prefer moist, fine food particles near the surface. Compost bins use native soil organisms and bacteria rather than surface-dwelling worms.
Do worm farms smell?
A healthy worm farm should smell like earth. Any unpleasant odour indicates overfeeding, too much acidic food, or anaerobic conditions. Add bedding, reduce feeding, and aerate by stirring the surface lightly.
Which is cheaper to run?
Both are very affordable. A DIY compost bin costs nothing (use pallets or a wire cage). Commercial bins start around $40. Worm farms cost $50–$250 for a kit, plus ongoing Bokashi or worm bedding. Both systems pay for themselves quickly through savings on garden fertiliser.