Container gardening suits people with tiny courtyards, balconies, window ledges and packed diaries. Get three simple things right — pot size, compost quality and watering routine — and you can grow flowers, cut-and-come-again salads and even proper shrubs without spending every evening tending them.

Why containers make sense for small spaces

Pots are flexible. They follow the sun around a patio. They lift colour to eye level, hide an ugly drain, screen a bin store and give you fresh leaves two steps from the kitchen door. If you rent, they travel with you. If you have limited mobility, raising a pot onto a bench means you can garden sitting down.

They do have one drawback: a container is a small, isolated world. Roots cannot wander in search of water, and nutrients wash out with every heavy watering. Everything below is really about compensating for that — and doing it in a way that fits around work, family and the British weather.

Choose bigger pots than you think you need

This is the single change that makes the biggest difference. A larger volume of compost holds more moisture, heats up and dries out more slowly, and gives roots room to spread. Small pots are the reason most beginners end up watering twice a day in July and still watching plants wilt.

• Minimum sizes: herbs and single lettuces in 3–5 litre pots; trailing flowers in 10–15 litres; tomatoes, courgettes and most patio shrubs in 20–30 litres; small trees in 40 litres or more.
• Go deep as well as wide. A tall pot shades its own compost, so it loses less water than a shallow bowl of the same volume.
• Group pots together. Clustering them creates a microclimate, with plants sheltering each other from wind and sun.
• Weight matters. If the pot will sit on a balcony, choose lightweight plastic or fibreglass, or place a heavy terracotta pot where it will stay put. Put a saucer or pot feet underneath to protect surfaces and improve drainage.
• Never use garden soil alone in a pot. It sets like brick, drains badly and carries weeds and pests.

Use quality compost and feed sensibly

Peat-free multipurpose compost is fine for most annuals, salads and herbs. For long-term shrubs and small trees, choose a soil-based compost such as John Innes No. 2 or No. 3, which holds its structure far longer.

Cheap compost is often the false economy here: it dries unevenly, slumps in the pot and leaves plants struggling by midsummer. Buy the best you can justify and you will spend less time fixing problems later.

• Mix in slow-release fertiliser at planting time, following the packet rate. This feeds for roughly three months with no effort from you.
• Add water-retaining granules to hanging baskets and any pot that gets full sun.
• Top-dress permanent pots each spring: scrape off the top 5cm of old compost and replace it with fresh, plus a slow-release feed.
• Liquid feed weekly from midsummer for hungry plants such as tomatoes, dahlias and pelargoniums. A high-potash tomato feed encourages flowers and fruit.

Water consistently — the habit that decides everything

Inconsistent watering causes more failures than pests, disease or shade. Plants that dry out and are then flooded drop their flowers, split their fruit and sulk for weeks.

The rule is simple: water thoroughly, less often. Fill the pot until water runs out of the drainage holes, so the whole root ball gets soaked. A daily light sprinkle only wets the surface and encourages weak, shallow roots.

• Check with a finger. Push it 2cm into the compost. If it feels dry at that depth, water. If it is damp, wait.
• Water in the morning where possible. Evening watering leaves foliage wet overnight, which invites mildew and slug damage.
• Summer means daily checks. In a heatwave, small pots may need water morning and evening. In spring and autumn, twice a week is often plenty.
• Self-watering pots and drip irrigation are worth the outlay if you travel or work long days. A simple timer and a length of soaker hose can cover a whole patio.
• Mulch the surface with a 2cm layer of gravel or bark. It slows evaporation dramatically and makes pots look tidy.

Easy, reliable plants to start with

Pick plants that forgive the odd missed watering. These all perform well in UK conditions and give a generous return for very little work.

• For colour: pelargoniums, begonias, cosmos, nasturtiums and dwarf dahlias. All flower for months with a weekly feed and deadheading.
• For cutting and eating: cut-and-come-again lettuce, rocket, chard, perpetual spinach, spring onions, mint, thyme and chives. Sow little and often for a continuous supply.
• For structure: lavender, hebe, skimmia, choisya and dwarf varieties of bay or olive. Evergreen, tolerant and happy in a large pot for years.

Feed and water shrubs regularly for the first season, then gradually less as they establish. Repot into a size up every two to three years, in early spring, before growth starts.

Small habits that save real time

Keep a watering can by the back door and fill it while the kettle boils. Deadhead spent flowers as you pass, which keeps new buds coming. Sow a few seeds every fortnight rather than all at once, so you are never overwhelmed by a glut. Wash pots and saucers in autumn before storing them, and empty any that hold stagnant water to discourage mosquitoes.

Do those small things consistently and even the busiest gardener ends up with a patio that looks after itself — full of scent, colour and something fresh to pick for dinner.