Growing food and plants in an urban setting has moved from countercultural hobby to mainstream practice. The surge in interest that began during the 2020 lockdowns has, unlike many lockdown habits, largely persisted — allotment waiting lists remain long, houseplant sales have stayed elevated, and balcony growing is now common enough that dedicated container-growing equipment has become a normal product category in garden centres.

If you have outdoor space — or even a south-facing windowsill — growing something is both feasible and, after the initial setup cost, significantly less expensive than buying the equivalent produce. This guide starts with what actually works rather than what looks good in lifestyle magazine photographs.

The Honest Assessment of Small-Space Growing

Container growing has genuine limitations that are worth understanding before you begin:

  • Yield is real but limited. A well-managed 60cm window box of salad leaves will produce 8–12 good-sized pickings over a season — genuinely useful, not just symbolic.
  • Some crops are not worth the effort in containers. Potatoes, squash, sweetcorn, brassicas (unless you have significant space) and carrots are difficult in container growing and produce poor results for the effort involved.
  • The per-item cost calculation often doesn't add up. A single tomato plant producing 3kg of fruit over a season sounds like a good deal until you factor in the compost, pots, feed and time. The value is in the quality and freshness, not in beating the supermarket price.
  • It works best for high-value, cut-and-come-again crops. Herbs, salad leaves, spring onions, radishes and chillies produce high value relative to the space they occupy and replace expensive supermarket purchases.

What to Grow: The Container Shortlist

Herbs: The single most practical thing to grow in any small space. Fresh basil, coriander, parsley, chives, mint, and thyme are all possible from a windowsill or small containers. A tray of mixed herbs started from seed in April costs £5–8; the equivalent herbs bought fresh at a supermarket across the season cost £40–60. Grow herbs in individual pots (not mixed bowls — they have different watering needs), and cut regularly to prevent bolting.

Salad leaves: A cut-and-come-again mix of salad leaves — rocket, mizuna, red mustard, lamb's lettuce — can be started from a £2 packet of seeds and a medium container. Sow every 3–4 weeks from March to August for continuous harvest. Cut 3–4cm above the soil when 10–15cm tall; new leaves grow back within 10–14 days.

Tomatoes: The most popular container crop and one of the most rewarding when it works. Cherry tomato varieties (Gardener's Delight, Sweet Million, Tumbler for hanging baskets) are better suited to containers than large-fruited varieties. They need: a large container (at minimum 30cm diameter, preferably larger), full sun (5+ hours direct sun per day), regular watering (consistent moisture, not boom-and-bust — cracking and blossom end rot both come from irregular watering), and regular liquid tomato feed from first flower onwards. Grow them outside from late May when frost risk has passed.

Chillies: Easier than tomatoes in some ways — more tolerant of irregular watering, less prone to disease — and extremely productive. A single chilli plant in a 20cm pot in a sunny position will produce more chillies than most households can use. Start from seed indoors in February/March or buy plants in May. They also overwinter successfully as houseplants — a mature chilli plant is genuinely a multi-year investment.

Courgettes: Surprisingly successful in large containers (at least 40cm diameter). One plant produces prolifically — usually more than most households want once it gets going. They need sun, generous watering and feeding. Pick frequently (every 2–3 days once fruiting begins) or they become marrows.

Soil: The Foundation

The most common beginner mistake is using cheap compost. Multi-purpose compost at £4–5 for 50 litres is significantly inferior to good peat-free compost for growing vegetables (£8–12 for 50L). The difference in plant performance is substantial — better water retention, more nutrients, better structure.

For permanent containers (herbs, perennials), mix good multi-purpose compost with 20–25% perlite (a mineral additive) to improve drainage. For tomatoes and heavy feeders, add a slow-release fertiliser granule to the compost at planting, then supplement with liquid tomato feed weekly once flowering begins.

Never use garden soil in containers — it compacts, drains poorly and introduces pests and diseases.

Watering: The Most Common Failure Point

Overwatering kills more container plants than underwatering in most UK contexts, because the instinct to "do something" when plants look unhappy often manifests as more water when the problem is actually too much water, root rot or poor drainage.

The check: push your finger 3–4cm into the compost. If it's damp, don't water. If it's dry at that depth, water thoroughly until it drains from the bottom.

The exception is in hot weather (above 24°C) with large, established plants in full sun — tomatoes, courgettes, beans in peak summer may need daily watering and will wilt visibly if under-watered.

Self-watering containers with reservoirs are genuinely useful for people who travel or forget to water.

Finding Space: Allotments and Community Gardens

For people without any outdoor space — or wanting significantly more growing space — allotments are the traditional British solution. A standard full allotment plot (250 sq metres) costs approximately £30–80 per year depending on council and location. Half plots (125 sq metres) are common and a better starting point.

Waiting lists vary dramatically: 1–3 years in most areas, 5–10 years in parts of London. Register your interest immediately if you're considering an allotment, even if you're not sure — you can always decline the offer when it arrives.

Community growing spaces, guerrilla gardening groups and shared growing initiatives are an alternative in some areas. They offer community as well as growing space — which, for many people who start growing, turns out to be as significant as the produce itself.