You don't need a plot to grow food. You need a windowsill, a few containers, and the right varieties. Britain has seen a genuine shift towards small-space growing — and the produce you can harvest from a balcony rail or a south-facing sill can be genuinely impressive.
This is a guide to the plants that actually deliver — quickly, reliably, in limited space — and how to get more out of them.
Start With the Fast Growers
Radishes. If you want a win in under four weeks, grow radishes. Sow direct into compost, keep them moist, and you'll be pulling them before most plants have even germinated. They're perfect for a first-time container grower — fast feedback, real food, minimal faff.
Salad leaves and cut-and-come-again lettuce. Sow a pinch, cut what you need with scissors, and the plant regrows. A windowsill trough can supply salad for weeks from a single sowing. Varieties like 'Salad Bowl', 'Lollo Rossa', or any mixed leaf blend work well in shallow containers.
Spring onions. Easy, compact, and useful. Sow in clusters rather than rows, keep them fed, and you'll have a continuous supply from a relatively small pot.
Herbs. Basil, coriander, chives, parsley. All will grow on a warm windowsill. Basil needs the most heat and dislikes cold draughts; the others are more forgiving. Keep them snipped to prevent bolting.
Vegetables Worth the Slightly More Space
Dwarf French beans. Compact varieties like 'Masai' or 'Safari' will produce a genuine crop in a deep container on a sunny balcony. They need support (a few short canes will do) and consistent watering once flowering starts.
Tomatoes — cherry varieties. 'Tumbling Tom', 'Balconi Red', or 'Sweet Million' are bred for hanging baskets and containers. They need feeding weekly once fruit sets. Don't let them dry out — irregular watering causes blossom end rot.
Courgettes. One plant will take up one large container and keep you supplied with more courgettes than you can eat. They're big, but they're extremely productive. Water generously and feed regularly.
Companion Planting in Small Spaces
Edible flowers aren't just decoration. Nasturtiums deter aphids and the flowers and leaves are edible — peppery, vivid, and great in salads. Marigolds planted alongside tomatoes and beans help repel common pests. In a small space, every plant should earn its keep in more than one way.
Calendula (pot marigold) attracts beneficial insects that prey on aphids, and the petals can be used in cooking. Sweet alyssum draws in hoverflies, which pollinate your crops. These companion plants aren't an afterthought — they're part of a productive small-space system.
The Feeding Question
Container-grown plants exhaust compost nutrients faster than anything in the ground. The roots can't go looking for what they need — the nutrients have to come to them. A fortnightly feed is essential from the moment plants start growing actively.
Chemical fertilisers give you a fast hit, but they don't build the soil biology that makes container compost productive over a full season. Northern Algae Natural Plant Booster delivers the proteins, polysaccharides and lipids your plants need from a 100% natural, microalgae-based formula — safe around children and pets, with no synthetic additives. Mix and apply every two weeks for consistent, healthy growth all season.
Sun, Drainage, and Watering
South or west-facing positions will give you the most options. North-facing is fine for salad leaves and herbs but rules out tomatoes and courgettes. Good drainage is non-negotiable — roots sitting in water will rot regardless of how well everything else is managed.
In warm weather, containers dry out fast. Check the compost daily during a heatwave — small pots may need watering twice. Water-retaining crystals added to compost help, but they're not a substitute for checking.