I composted on a balcony for four years before moving to a house with a yard. It’s absolutely doable. But every guide I found when starting out was written by someone with a large garden who’d clearly never tried composting in a 2-metre-wide space shared with a drying rack and a barbecue.

Balcony composting has specific constraints: limited space, neighbours who’ll complain about smells, no ground contact, and usually no room for a traditional tumbler. Here’s what actually works, based on what I tried and what failed.

The Three Viable Options

1. Worm Farm (Vermicomposting)

This is what I recommend for most balcony composters. A worm farm is compact, produces excellent fertiliser, processes food scraps continuously, and — when managed properly — doesn’t smell.

Setup: A stacking worm farm (like the Tumbleweed Worm Cafe or similar) takes up about 40x40cm of floor space. The cost is $60-100 for a kit, or you can build one from stacking plastic tubs for about $20.

You’ll need roughly 1,000 composting worms (red wrigglers or tiger worms). Buy them from garden centres or online — about $30-40 for a starter population.

What goes in:

• Fruit and vegetable scraps (chopped small)
• Coffee grounds and tea bags (remove staples)
• Cardboard and newspaper (torn into pieces — this is your “brown” material)
• Crushed eggshells
• Small amounts of bread and grains

What stays out:

• Meat, fish, dairy (attracts pests and smells terrible)
• Citrus in large quantities (too acidic for worms)
• Onion and garlic (worms dislike them)
• Oily food
• Pet waste

Managing smell: A healthy worm farm smells like forest floor — earthy and pleasant. If it smells bad, something’s wrong:

• Too much food (worms can’t keep up) — reduce inputs
• Too wet (anaerobic conditions) — add more cardboard/newspaper
• Meat or dairy in the bin — remove it immediately

I kept my worm farm in a sheltered corner of the balcony. It handled all the kitchen scraps from a two-person household with room to spare. In hot Melbourne summers, I moved it to the shadiest spot — worms struggle above 30°C and die above 35°C. An old towel draped over the top provides evaporative cooling on hot days.

Output: Worm castings (vermicast) are incredible fertiliser. Rich in nutrients, beneficial microbes, and humic acids. I used mine directly on my balcony pot plants — a handful mixed into potting mix or dissolved in water as liquid feed. My plants noticeably improved when I started using vermicast.

The worm farm also produces “worm tea” (liquid that collects in the bottom tray). Dilute it 10:1 with water and use as liquid fertiliser.

2. Bokashi Bin

Bokashi is a Japanese fermentation method that works brilliantly for small spaces. Unlike traditional composting, bokashi ferments food scraps using microorganisms — it pickles them rather than decomposing them.

Setup: A bokashi bin is a sealed bucket with a drain tap at the bottom. $40-60 for a kit. You also need bokashi bran (inoculated grain) — about $15-20 per bag, which lasts months.

How it works:

1. Add food scraps to the bin in layers
2. Sprinkle bokashi bran over each layer
3. Press down firmly to remove air
4. Close the lid tightly
5. Drain liquid from the tap every few days

After 2-3 weeks, the bin is full of fermented scraps. This fermented material isn’t finished compost — it needs to be buried in soil (a garden bed or a large pot of soil) where it breaks down fully in another 2-4 weeks.

Advantages: Bokashi handles meat, dairy, and cooked food — things a worm farm can’t. The sealed system means virtually no smell during fermentation (it smells mildly pickled when you open the lid, but it’s not offensive). And it’s fast — a bin ferments in 2-3 weeks.

Disadvantages: You need somewhere to bury the fermented output. On a balcony, this means maintaining a large pot (60+ litres) of soil as a “digester” that you rotate — bury fermented scraps in one half, use finished compost from the other half. It works but takes up space.

The bokashi liquid drained from the tap is potent fertiliser — dilute 1:100 with water. It can also be poured down drains to help keep pipes clean (the beneficial microbes break down organic buildup).

3. Countertop Electric Composter

Devices like the Lomi and Vitamix FoodCycler have become popular. They grind and heat food scraps into a dry material over several hours.

Setup: Sits on a kitchen bench. Costs $400-600. Uses electricity for each cycle.

What I think: I tried a FoodCycler for six months. It works — you put scraps in, press a button, and get dry material out. But it’s not true composting. The output is dried, heated food waste. It doesn’t contain the beneficial microbial communities that make real compost valuable. It’s essentially a food dehydrator with a grinder.

The output is fine as a soil amendment but inferior to worm castings or properly composted material.

For the price, a worm farm produces better results with lower ongoing costs. I’d only recommend an electric composter if you genuinely can’t manage a worm farm (no balcony, extreme heat, rental restrictions on outdoor items).

What I Actually Did

My balcony setup was:

• Worm farm in the shadiest corner — handled all our daily fruit/veg scraps
• Small bokashi bin under the kitchen sink — for meat scraps, cooked food, and things worms don’t eat
• Bokashi output buried in a large pot of soil on the balcony that I rotated quarterly

This combination handled virtually all food waste from a two-person household. We went from a full kitchen bin every 3-4 days to one every 2 weeks.

Organisations working on urban sustainability — including Sustainability Victoria — have been promoting small-scale composting as one of the most effective individual actions for waste reduction. They offer workshops and subsidised worm farm programs that are worth checking for Melbourne residents.

Troubleshooting Common Problems

Fruit flies. The bane of indoor/balcony composting. Keep the worm farm covered. Bury food scraps under bedding rather than leaving them on top. If fruit flies are bad, freeze scraps overnight before adding them — this kills fruit fly eggs.

Too wet. Add more dry brown material — shredded cardboard, newspaper, dry leaves. A healthy worm farm should be moist like a wrung-out sponge, not dripping.

Too dry. Spray with water from a spray bottle. Don’t flood it.

Ants. A sign the bin is too dry or acidic. Add moisture and a small amount of garden lime. Ants are annoying but not harmful to the composting process.

Worms escaping. Usually means conditions inside are wrong — too acidic, too wet, or too hot. Fix the conditions and they’ll stop trying to leave. Leave the lid off with a light on nearby — worms dislike light and will burrow back in.

Is It Worth It?

Honestly? For the environmental benefit alone, probably. Melbourne sends about 250,000 tonnes of food waste to landfill annually. Composting at home diverts your share of that.

But the practical benefit is real too. Free, high-quality fertiliser for your plants. Less smelly kitchen bin. Less frequent bin collections. And there’s something satisfying about closing the loop — scraps become compost, compost feeds plants, plants produce scraps.

A worm farm costs $60-100 to set up and requires maybe 10 minutes of attention per week once established. For what you get back — both environmentally and practically — it’s one of the most worthwhile things you can do with a small corner of a balcony.

Start with a worm farm. Get comfortable with the process. Add bokashi if you want to handle meat and dairy. It’s simpler than it sounds, and the results are genuinely useful for any plant collection.