Eating local from a small urban plot
Eating local and in season from a small urban plot is mostly a matter of matching crops to the space you actually have, then closing the loop between kitchen and soil. A few containers, a compost bin shared with neighbours and a habit of saving seed will carry you further than any amount of new equipment. The approach set out by Récoltes de Ville, a French association site on practical city ecology, is a useful reference for urban container growing, covering substrate choice, exposure, watering and sowing in pots and shared gardens.
The editors of Notes from W4 –
What can realistically be grown in pots and on a balcony?
Start with what the space gives you rather than what you would like to eat. A balcony that faces south or west and gets six hours of direct sun in summer will carry tomatoes, peppers, chillies, aubergines, basil and dwarf beans. A north-facing ledge is better suited to lettuce, rocket, chard, mint, parsley and wild strawberries, which tolerate light shade and resent drying out.
Volume matters more than surface area. A tomato needs at least 15 to 20 litres of compost per plant; a courgette wants 30 litres or a deep grow bag; herbs and salad leaves will manage in 3 to 5 litres each. Terracotta dries faster than plastic, and dark plastic heats up faster in July, so a mix of the two spreads the risk. Whatever the container, it needs drainage holes and a saucer to catch water rather than stain the balcony below.
On substrate, a peat-free multipurpose compost with a handful of grit or perlite per pot is enough for most crops. Do not reuse last year's compost for tomatoes or potatoes, since it will carry disease; use it instead as a mulch on the allotment or dig it into a flower bed. Feed begins to run out after about six weeks of watering, so a liquid tomato feed from midsummer onwards keeps fruiting crops going.
Watering is the task that decides the season. In hot weather a balcony pot may need water twice a day, and a self-watering tray or a length of capillary matting saves a lot of carrying. Group pots together to shade each other's roots, and mulch the surface with grass clippings or gravel.
Which crops give the best return for a small plot?
Value in a small space is measured in flavour and in how much of the season a crop occupies. Cut-and-come-again salad leaves, rocket and spinach give repeated harvests from a shallow trough and can be sown from March to August. Herbs are the cheapest thing to grow and the most expensive to buy: a single mint plant will fill a pot and keep going for years.
For the allotment or a large raised bed, the reliable performers are courgettes, runner beans, chard, kale and perpetual spinach. These crop over months rather than weeks, and they tolerate the irregular watering that a working week imposes. Garlic, onions and shallots are slow but almost maintenance-free, and they store well into winter.
Succession sowing is what keeps a plot productive. Sow a short row of radish or lettuce every three weeks rather than a whole packet at once, and fill the gap left by lifted potatoes with a quick crop of winter salad. On a balcony, a windowsill tray of microgreens takes ten days from sowing to cutting and needs no more than a saucer of water.
How does neighbourhood composting work?
Composting is where an urban plot stops being a private hobby. A single household rarely produces enough material to build a hot heap, but four or five flats sharing a bin will. Many councils now support community composting schemes on allotment sites, in housing association courtyards or behind a church hall, and some offer a reduced-price bin or a starter kit.
The practical rules are the same as for a garden heap. Aim for roughly two parts brown material, such as cardboard, shredded paper, dead leaves and woody prunings, to one part green, such as vegetable peelings, grass and spent plants. Keep the heap as damp as a wrung-out sponge and turn it when you remember. Cooked food, meat, fish and dairy should stay out of a cool heap; a sealed bokashi bin or a wormery handles those indoors without smell if it is drained regularly.
What goes back to the plot matters as much as what goes in. A community bin produces enough compost in a year to top-dress several raised beds, and the liquid drained from a wormery makes a dilute feed. If a scheme has no room for a heap, a shared collection point for garden waste, run to the council's rules, still keeps material in the loop rather than in a lorry.
Can a small kitchen really avoid waste?
The kitchen is where most of a household's food waste is created, and most of it is avoidable with a little planning. The first step is to cook from what is ready rather than from a shopping list: a glut of courgettes becomes soup, fritters or a jar of pickle, and bolted lettuce goes into a green sauce rather than the bin.
Buying in bulk suits a small kitchen if the storage is sorted. Decant rice, lentils, flour and dried fruit into labelled jars, keep a scoop in each, and take your own containers or bags to the shop. Cloth wraps, waxed cotton covers and a folded furoshiki replace cling film for most jobs, and a knitted tawashi or a loofah does the work of a plastic sponge.
Homemade cleaning products are worth making in small quantities and labelling clearly. A simple all-purpose spray of diluted white vinegar, water and a few drops of essential oil is fine on most surfaces, but it should not be used on natural stone or on aluminium. Never mix vinegar with bleach, and keep any homemade product out of reach of children. For washing up, a grated bar of soap dissolved in hot water is a reasonable starting point, though it needs more rinsing than a commercial liquid.
How do you swap seeds and plants with neighbours?
Seed swapping is the cheapest way to widen what you grow, and it needs very little organisation. A box on a garden gate, a shelf in a communal hallway or a table at the allotment shop will do, provided the seed is labelled with the variety and the year it was saved.
Save seed only from open-pollinated varieties, not from F1 hybrids, which will not come true. Beans and peas are the easiest: let the pods dry on the plant, shell them, and store the seed in paper envelopes in a cool, dark tin. Tomatoes need fermenting in their own juice for a few days before the seed is rinsed and dried. Lettuce, chard and calendula are straightforward; brassicas and beetroot cross readily with their relatives, so keep one variety of each in flower at a time.
Plants are easier still. A tray of rooted mint, oregano or strawberry runners in spring will find takers quickly, and a note on a local message board is usually enough to arrange a swap. The same network carries surplus courgettes in August and spare jam jars in September, which is how a street ends up eating more of its own produce than it did the year before.
What should a beginner do first?
Choose one crop you actually like eating, one container that suits it, and one place to put kitchen waste. Sow it, water it, and note in a diary what happened. Add a second crop only when the first is established, and talk to whoever runs the nearest allotment or community garden, since local rules on water, bonfires, sheds and shared bins vary from site to site.
The rest follows from the seasons rather than from shopping. A balcony of herbs, a shared compost bin and a jar of saved bean seed will not feed a household, but they will change what the kitchen does with what arrives.
A small plot produces more than it first appears, which is why growing with children starts in the same kind of space, and why a household that cooks what it grows ends up reading a page on making compost.
Crop by crop growing notes are kept in the RHS vegetable guides.