Growing Food in a Small Space: What Actually Pays Off
A balcony will not feed you. Neither will a courtyard, and a suburban backyard will only do it with serious effort and land.
Saying so up front matters, because the standard fantasy — self-sufficiency in a few pots — is exactly why most people plant a garden in September and abandon it by December. What a small space can do is produce the expensive, perishable things you buy constantly and waste half of. That is a real return, and it is achievable.
The 10-minute version
- Grow what is expensive and perishable, not what is cheap and storable. Herbs, salad greens and chillies return their cost many times over; potatoes and onions never will.
- Sun is the constraint, not space. Fruiting plants need six-plus hours of direct sun. Leafy things manage on three or four. Measure yours before buying anything.
- Start with four pots. Almost everyone who fails started with twenty.
What pays for itself
Herbs — by a wide margin the best return.
A supermarket packet of basil or coriander costs $3–4, is used twice, and the rest liquefies in the crisper. A single plant produces continuously for months.
- Perennial and hard to kill: rosemary, thyme, oregano, mint (in its own pot — it will strangle anything sharing with it), chives, bay
- Annual, worth resowing: basil, coriander, parsley, dill
- Coriander bolts in heat. Sow it in autumn and winter in most of Australia, and accept that summer coriander is a losing battle
Salad greens — fast, and expensive to buy.
Lettuce, rocket, mizuna, and cut-and-come-again mixes. Sown thickly in a shallow tub, harvested with scissors, regrowing three or four times. Six weeks from seed to first cut. A $4 seed packet replaces a great many $5 bags.
Chillies — absurdly productive.
One plant in a pot will out-produce what most households consume, lives for years in warm areas, and is perennially expensive to buy.
Spring onions, silverbeet and kale.
Cut-and-come-again crops that keep producing rather than being harvested once. Silverbeet in a large tub in a courtyard will supply a household with greens for most of a year.
Cherry tomatoes, if you have real sun. Full-sized tomatoes need more root volume and more sun than most balconies offer; cherry varieties are far more forgiving and produce heavily.
Lemons. A dwarf citrus in a large pot is a genuine long-term win in most Australian climates, and lemons are expensive.
What is not worth it in a small space
Not because they cannot be grown, but because the space-to-value ratio is poor:
- Potatoes, onions, garlic, pumpkin. Cheap, store well, and take up enormous space for months
- Corn. Needs a block to pollinate properly and yields two cobs per plant
- Broccoli and cauliflower. One head per plant, months of occupancy, cheap to buy
- Carrots in shallow pots. They fork and stay small
- Full-sized tomatoes on a shaded balcony. The commonest disappointment in balcony gardening
The actual constraints
Sun. Spend a day noting where direct sun falls and for how long.
- 6+ hours: tomatoes, chillies, capsicum, eggplant, beans, citrus
- 4–6 hours: most herbs, silverbeet, kale, spring onions
- 3–4 hours: lettuce, rocket, mint, parsley — and leafy greens often prefer afternoon shade in an Australian summer
- Under 3 hours: mint and not much else. Be honest about this
Pot size decides everything.
- Herbs and lettuce: 20–25 cm
- Silverbeet, kale, spring onions: 30 cm
- Chillies, cherry tomatoes: 40 cm minimum
- Dwarf citrus: 50 cm or larger
Undersized pots dry out in hours in summer, and that is the single most common cause of failure.
Water. Pots dry far faster than ground. In an Australian summer a small pot in full sun may need daily watering, sometimes twice. Self-watering pots and wicking beds are transformative for anyone who travels, forgets, or works long days — they turn a daily obligation into a weekly one.
Soil. Use potting mix, not garden soil, which compacts into concrete in a pot. Buy the Australian Standards mark — the red ticks — because cheap mix is a false economy. Refresh or top up annually, and feed regularly; pots have no reserves.
Wind. Balconies, especially high ones, are brutal. Wind desiccates plants faster than heat and snaps stems. Shelter with a screen or by grouping pots.
Weight. Wet pots and soil are heavy. Check strata rules and balcony load limits before installing a wicking bed.
The honest yield
For realistic expectations:
- Four herb pots replace maybe $200–400 a year of supermarket herbs, at a setup cost of around $60. Excellent return
- A tub of cut-and-come-again salad yields perhaps $100–150 a year for $20 of seed and mix
- One chilli plant — more than most households use
- A serious backyard vegetable garden can meaningfully supplement a household’s vegetables, and still will not replace the shop
- Feeding a family from your own land requires hundreds of square metres, considerable skill, and preservation infrastructure
Where it genuinely contributes to resilience: fresh food during a supply disruption, when tinned and dried staples cover calories but nothing green. A pot of silverbeet and a herb tub is a real quality-of-life difference in a bad fortnight — and see feeding a household without refrigeration for the rest of that picture.
Thresholds
| Situation | The rule |
|---|---|
| Under 3 hours of sun | Mint and shade herbs. Do not buy tomato seedlings |
| 4–6 hours | Herbs, leafy greens, spring onions |
| 6+ hours | Chillies, cherry tomatoes, beans, citrus |
| Choosing what to grow | Expensive and perishable, never cheap and storable |
| Pot size | Bigger than you think. Small pots cook in summer |
| Summer, small pot, full sun | Daily watering, sometimes twice |
| You travel or forget | Self-watering pots or wicking beds. Not optional |
| Soil | Potting mix with the Australian Standards red ticks. Never garden soil |
| Starting out | Four pots. Twenty is how people quit |
| Balcony wicking beds | Check weight limits and strata rules first |
What it costs
| Tier | Spend | What it buys |
|---|---|---|
| Starter | ~$50–80 | Four pots, a bag of quality potting mix, four herb plants, a watering can. Pays for itself in a season |
| Solid | ~$120–200 | Add a large tub for salad greens, a chilli plant, seed packets, liquid fertiliser |
| Better | ~$250–400 | Self-watering pots or a small wicking bed, a dwarf citrus, a wind screen |
| Serious | ~$600–1,500 | Raised beds in a courtyard or yard, irrigation on a timer, compost bin |
| Ongoing | ~$40–80/year | Potting mix top-up, seeds, fertiliser |
The drill: the first weekend
- Track the sun for one day. Write down where direct sun falls and for how many hours.
- Buy four pots at least 25 cm across, and one bag of standards-marked potting mix.
- Plant four herbs you actually cook with — most households should pick from rosemary, thyme, parsley, basil, mint and chives.
- Sow one shallow tub of mixed salad greens thickly. First cut in about six weeks.
- Water deeply, until it runs out the bottom, rather than lightly and often.
- Feed fortnightly with liquid fertiliser once things are growing.
- Add one pot a month, only if the existing ones are still alive. That single rule is the difference between a garden and a graveyard.
Frequently asked questions
What is the most worthwhile food to grow in a small space?
Herbs, by a wide margin. They are expensive to buy, perish quickly, and a single plant produces for months. Salad greens, chillies, spring onions and silverbeet are the next best returns.
Can I grow enough food on a balcony to be self-sufficient?
No. A balcony can supply herbs, salad greens, chillies and some leafy vegetables — genuinely valuable and expensive things — but feeding a household requires hundreds of square metres, considerable skill and preservation infrastructure.
How much sun do vegetables need?
Fruiting crops such as tomatoes, chillies, capsicum and beans need six or more hours of direct sun. Herbs and leafy greens manage on four to six, and lettuce, rocket and mint tolerate three to four — often preferring afternoon shade in an Australian summer.
Why do my pot plants keep dying in summer?
Almost always because the pot is too small and dries out. A small pot in full Australian sun can need watering twice a day. Use larger pots, quality potting mix, and self-watering pots or wicking beds if you cannot water daily.
What should I not bother growing in pots?
Potatoes, onions, garlic, pumpkin, corn, broccoli and cauliflower. All are cheap to buy, store well, and occupy a great deal of space for months in exchange for a single harvest.
Can I use garden soil in pots?
No. Garden soil compacts in containers, drains poorly and suffocates roots. Use potting mix carrying the Australian Standards red ticks — the cheap unmarked mixes are a false economy that costs you the plants.
This article is general information, researched from the sources listed below and not reviewed by a professional in the relevant field. Check the sources, and get advice or training suited to your situation. Read our full disclaimer.