How to compost kitchen scraps when you have no backyard

Australia sends roughly 2.5 million tonnes of food waste to landfill every year, and a big chunk of that comes from suburban kitchens and inner-city units where a backyard compost heap simply isn't an option. The good news for renters in Brisbane, Melburnians in apartments, or anyone in a townhouse with a tiny courtyard is that small-scale composting has come a long way. With the right kit and a few habits, you can turn peelings, coffee grounds and crusts into rich fertiliser without ever touching a garden bed.

This guide walks through the practical choices for composting kitchen scraps without a backyard, from worm farms on the balcony to bokashi bins under the sink, and explains how Australian councils and community gardens can take the scraps you can't process yourself. It's written for people who'd rather not chuck another full bag of rubbish into the wheelie bin each week.

Pick a system that fits your space

Before you buy anything, think about where the system will live and how often you cook. A flat in Parramatta with a small laundry and a north-facing balcony has very different needs to a one-bedder in Surry Hills with only a shady courtyard. The four main options for small-space composting are bokashi bins, worm farms, electric dehydrating composters, and council or community drop-off points.

Bokashi bins are sealed buckets that ferment scraps using a special bran, so they handle everything from avocado stones to small amounts of cooked rice. Worm farms use tiger worms to eat through fruit and veg scraps, and they produce both worm castings and a liquid fertiliser that dilutes beautifully for pot plants. Electric composters dry and grind scraps overnight, which is handy if you're squeamish but more expensive upfront. Finally, many local councils now run food waste collections or partner with community gardens that welcome your scraps if you bag them properly.

Set up a bokashi bin under the sink

A bokashi bin is probably the easiest entry point for anyone renting, because it doesn't smell if it's sealed properly and it fits in a kitchen cupboard the size of a nappy bucket. You layer scraps inside, sprinkle a handful of bokashi bran, press down to remove air, and close the lid. Every couple of days the liquid that collects at the bottom needs draining — it's gold for watering indoor plants, so don't tip it down the sink.

Once the bucket is full, you have two choices: bury the fermented material in a friend's garden or large planter, or add it to an outdoor compost heap in stages. Australians who travel often love bokashi because it tolerates longer gaps between emptying. If you're a regular coffee and tea drinker, you'll know the spent grounds and tea leaves from your daily brew are exactly what bokashi thrives on.

Run a tidy worm farm on the balcony

Worm farms feel a bit daggy until you realise how quiet they are and how quickly a healthy colony will eat through a bag of carrot peelings, banana skins and the limp lettuce at the back of the crisper. A standard farm from an Australian supplier such as Tumbleweed or The Worm Shed holds about 30 litres of material and houses roughly 1,000 worms. Sit it somewhere sheltered — under a bench, on a shaded balcony, or in the garage — because worms don't love the harsh Australian afternoon sun.

Add bedding like soaked cardboard or shredded newspaper on top of the composted layer, then introduce your worms and let them settle for a week. Feed them small amounts to start, then build up. Keep the lid on to keep possums and bush rats out, particularly if you're near a parkland like the Domain in Sydney or the Brisbane Botanic Gardens. Worm wee is potent, so dilute it to roughly one part liquid to ten parts water before using it on herbs or balcony tomatoes.

Feed your system the right scraps

Knowing what to chuck in and what to keep out makes the difference between a thriving bin and a slimy mess. In general, anything that came from a plant is fair game, while animal products and oils cause problems because they attract pests and slow down the biological process.

Scraps that compost well in a bokashi bin or worm farm:

• Fruit and vegetable peelings, cores and wilted herbs
• Coffee grounds and loose-leaf or bagged tea
• Crushed eggshells, plain bread and plain pasta
• Small amounts of cooked rice, paper towels and shredded cardboard
• Hair, vacuum cleaner dust and wood ash in moderation

Scraps to avoid or feed very sparingly:

• Meat, fish, bones and dairy products
• Large amounts of citrus peel, garlic and onion
• Heavily oily or greasy food
• Pet droppings or treated timber
• Glossy magazines or coated cardboard

If you've got more scraps than your home system can handle, most Coles and Woolworths stores will take compostable packaging back, and some cafes in Melbourne and Sydney have started running commercial composting drop-offs for locals.

Use council programs and community gardens

Many Australian councils have moved well beyond the basic yellow-top bin. Brisbane City Council offers subsidised compost bins and workshops through its kerbside collection events, the City of Sydney runs a popular community composting hub in Glebe, and the City of Melbourne partners with ShareWaste to connect householders with nearby composters. A quick search on your council's website usually reveals whether they collect food scraps, host drop-off days at the local library, or run free bokashi workshops at the community centre.

If you fancy getting your hands dirty without owning land, community gardens welcome volunteers and are usually thrilled to receive a bucket of fermented scraps or worm castings. Places like Randwick Community Garden in Sydney or West End's own patches in Brisbane will happily swap a bag of compost for an arvo of weeding. Building this kind of routine into your week is one of the easier ways to cut household waste and meet locals who care about the same things.

Reducing food waste and looking after your household go hand in hand with broader resilience, especially heading into bushfire season on the east coast. If you're tightening up the kitchen, it's worth thinking about a broader family emergency plan so the whole home runs a bit smoother year round.

A small compost system is one of those easy wins that pays you back in less rubbish, better pot plants and the quiet satisfaction of closing the loop. Pick a bokashi bin or worm farm that suits your space this weekend, sign up with your council's food waste program if there's one running nearby, and start saving your scraps instead of sending them to landfill. Your plants, your bin and the planet will thank you for it.