Small Spaces, Real Harvests

There is a particular pleasure in stepping out of a back door on a July evening, secateurs in hand, and cutting a handful of rocket and a couple of warm tomatoes for supper. Nothing about that pleasure requires an acre of land. A narrow patio, a balcony with a decent rail, a fire escape that catches the sun, or even a wide windowsill can produce a genuinely useful amount of food if you plan for the space you actually have rather than the space you wish you had.

The trick is to be honest about your constraints before you spend a penny on seeds. Measure the area, note which way it faces, and work out how many hours of direct sun it receives in midsummer. Most fruiting crops — tomatoes, peppers, chillies, courgettes — want six hours or more. Salad leaves, herbs, radishes and chard will manage on four, and will often thank you for a little shade in the hottest part of the day.

Containers, Compost and Drainage

What you grow in matters far more than what you grow in it. A decorative pot that holds nine litres of compost will disappoint you by August, however lovingly tended. Aim for volume: 20 to 30 litres for a single tomato plant, at least 15 litres for a courgette, and a decent trough of 40 centimetres depth for salad. Terracotta dries out fast in wind; glazed ceramic, plastic, or lined wooden planters hold moisture far better.

Drainage is non-negotiable. Every container needs holes in the base, and a few crocks or a layer of gravel over them stops compost washing out. On a balcony, stand pots on feet so water can escape and so the roots do not cook against hot paving.

Use a good peat-free multipurpose compost, and mix in slow-release fertiliser at planting time. Compost alone runs out of steam after about six weeks of hungry growth. From mid-June onwards, feed tomatoes and peppers weekly with a high-potash liquid feed, and give salad and herbs a weaker general feed every fortnight.

Choosing Crops That Earn Their Space

Balconies and patios reward plants that crop heavily, crop repeatedly, or crop fast. Cut-and-come-again leaves are the great success story of small-space growing: a 60-centimetre trough sown with rocket, mizuna, and loose-leaf lettuce can be harvested three or four times over a season. Sow a short row every fortnight from March to August and you will never be short of a salad.

Herbs are the obvious starting point, but choose carefully. Basil, parsley, coriander, chives, mint and thyme all thrive in pots. Rosemary and sage prefer drier conditions and a sunnier spot. Mint must be kept in its own container or it will march through everything else.

• Tomatoes: choose a compact bush or tumbler variety for hanging baskets and small pots. Cordons need staking and side-shooting but crop more heavily.
• Salad leaves: fast, forgiving, and expensive to buy. Sow little and often.
• Radishes: ready in three to four weeks, ideal for filling gaps.
• Chard and spinach: tolerant of partial shade and cut repeatedly.
• Climbing beans: grow upwards on a wigwam of canes and take up almost no floor space.
• Courgettes: one plant is plenty, and will feed a household through August.

Think vertically wherever you can. Wall-mounted troughs, tiered planters, and shelves on a sunny wall can double your growing area without stealing a centimetre of standing room.

Watering Through a British Summer

Containers dry out in a way that garden soil never does, and a single missed day in a heatwave can set a tomato plant back a fortnight. Water thoroughly rather than little and often — a proper soak every day or two encourages deep roots, while a daily dribble only wets the surface. Early morning is best; evening watering invites slugs and mildew.

Mulch the surface of every pot with a centimetre of gravel, bark, or even grass clippings to slow evaporation. Group pots together so they shade one another. If you are away, a simple capillary mat, a homemade drip system made from a plastic bottle with a pinprick in the lid, or a friendly neighbour will see you through.

Feeding and watering together is the rhythm of the small garden. Get it right and plants will reward you well beyond their modest footprint.

Feeding the Soil Between Crops

By late summer, compost in a container is tired, compacted, and often full of vine weevil grubs. Rather than topping up and hoping, empty each pot at the end of its crop, shake the roots free, and spread the spent compost on the flower border or over the veg patch as a soil conditioner. Then refill with fresh mix and a handful of worm-rich compost for the next sowing.

This habit keeps disease pressure low and gives autumn and winter crops — winter lettuce, oriental greens, and hardy herbs — a clean start. A pot left to grow the same tomato in year after year will sulk and then fail.

The Almanac View

Small-space growing follows the same calendar as any kitchen garden, just scaled down. Start chitting potatoes on a windowsill in February. Sow tomatoes indoors from late February to March under cover, and move them outside once night temperatures hold above ten degrees, usually by early June in the south and a fortnight later in the north. Salad can be sown outdoors from March, with successional sowings every two to three weeks until August, then again for a late crop in September.

Watch for late frosts — the old rule about waiting until the hawthorn is in flower still holds good in most of Britain — and keep a length of horticultural fleece to hand for cold nights. Above all, keep notes. A simple notebook recording what you sowed, when, and how it did will teach you more about your own patch of sunlight than any book can.

Start small, sow often, water well, and by August you will be eating from a space you once thought too cramped to bother with.