You do not need acres to grow a serious amount of food. A small garden, a few containers, and a sunny wall can produce salads, herbs, and vegetables for most of the year. The trick is to stop thinking in rows and start thinking in layers: what grows up, what grows down, and what fills the gaps between them.

Small spaces reward crops that are expensive to buy, quick to grow, or impossible to find fresh. Salad leaves, herbs, spring onions, radishes, and cherry tomatoes top the list. A square metre of cut-and-come-again lettuce can feed a household salads for weeks, while the same space given to a single cabbage gives you one meal. Grow what you eat often and what costs most at the shop.

Skip the space hogs in year one. Potatoes, pumpkins, and sweetcorn are wonderful crops, but they eat ground that could hold five other things. Grow them in bags or at the edge of the plot once the small-space system is working, not before.

Vertical growing doubles a small garden. Beans, peas, cucumbers, and tomatoes climb a trellis or a string, turning a fence or a wall into productive ground. A simple frame of bamboo canes against a sunny wall holds a season of climbing beans, and the shade underneath suits lettuce and herbs that would bolt in full sun.

Containers are the other half of the trick. A deep pot grows a surprising amount: one tomato plant, a dozen carrots, a whole herb garden on a windowsill. Use the biggest containers you can, because small pots dry out fast and stressed plants stop producing. Self-watering pots and a thick mulch layer buy you days of forgiveness when life gets busy.

The most productive small gardens never have an empty bed. When the spring radishes come out, summer beans go in. When the beans finish, autumn kale goes in. This is called succession planting, and it is the single biggest yield multiplier in a small space. Keep a simple calendar: sow a new row every two or three weeks through the season, and you will harvest continuously instead of in one overwhelming glut.

Feed the soil and it feeds you. Compost, mulch, and a little patience turn poor ground into good ground within a season or two. A small garden that is tended a little every day will out-produce a large garden that is visited once a week. Start small, grow up, keep the beds full, and the harvest will take care of itself.

Small gardens attract the same pests as large ones, but chemicals are a poor answer in a space where you live, eat, and breathe. Companion planting does quiet work: marigolds deter many insects, basil protects tomatoes, and onions confuse the pests that hunt carrots. Netting over brassicas keeps cabbage butterflies off without a single spray, and a beer trap sunk in the soil deals with slugs better than most products on the shelf.

Hand-picking is the most effective pest control in a small garden, because the garden is small enough to walk in five minutes. Check the undersides of leaves every few days, squash the eggs before they hatch, and remove any plant that is badly infested before it spreads the problem. Healthy soil helps too: strong plants resist pests far better than stressed ones, so feed the soil and the plants will largely look after themselves. Keep a simple garden journal with what you planted, when, and how it did, because next year's garden will be twice as good when it is built on this year's notes instead of this year's guesses.