Raised Beds for Vegetables: The Easy Way to Grow Your Own

Raised beds are the easiest way to grow your own vegetables. You fill a simple timber frame with good soil, so drainage, depth and quality are all under your control. Keep beds to about 1.2 metres wide so you can reach the middle without treading on the soil, make them at least 30cm deep for salad and roots and 45cm for most crops, and you have a productive, low-bending plot that warms up early in spring.

The short version

Why bother: better drainage, soil you control, warmer earth for earlier sowing, and far less bending and weeding.
Size: about 1.2m wide (reach from both sides); any length; depth 30cm for salad and roots, 45cm for most veg, 60cm on paving or for deep-rooting crops.
Build it from: pressure-treated timber, scaffold boards, sleepers, recycled-plastic boards or pallet collars.
Fill it with: roughly two-thirds topsoil to one-third compost. A 1.2 x 2.4m bed at 30cm deep needs about 860 litres; bought as 50-litre bags that is around £70–£140, and cheaper if you layer bulky free material underneath.
Easiest crops: salad leaves, radish, beetroot, courgettes, French and runner beans, chard and potatoes.

Why grow vegetables in raised beds

A raised bed is a bottomless frame of soil sitting proud of the ground. That small change fixes most of the things that make growing your own harder than it should be.

You control the soil. This is the real prize. Whatever lies beneath — heavy clay, builder’s rubble, thin chalk — you fill the bed with exactly the soil vegetables want. The Royal Horticultural Society notes this is especially useful for veg, which often have particular soil needs.

It drains better. Soil held above the surrounding ground sheds excess water, which matters a great deal in a wet British spring. Free-draining soil also warms faster, so a raised bed lets you sow and plant earlier — often a few weeks ahead of open ground.

Far less bending, and no compaction. The raised sides bring the work up towards you, so weeding and harvesting are kinder on the back. Because you never walk on the bed, the soil stays light and open and roots run freely. You also do less weeding, as there is less bare ground for weeds to colonise.

Start with one bed, fill it well, and grow the things you actually like to eat. A single good bed beats three neglected ones.

What size should a raised bed be

Keep the width to about 1.2 metres so you can reach the centre from either side without standing on the soil. The RHS suggests keeping beds under 1.5m wide, and around 1.2m if you want to work comfortably from both sides. Length is up to you and your timber — 2.4m (a standard board) is a sensible, manageable bed. If a bed sits against a wall or fence, halve the width to about 60cm, since you can only reach it from one side.

Depth is the part most beginners get wrong, and it depends on what you are growing and what the bed sits on.

How wide and how deep: about 1.2m across, with the depth set by your crops. Source: RHS guidance.

How deep does a raised bed need to be

Depth	Good for	Notes
30 cm (12in)	Salad leaves, radish, spring onions, beetroot, strawberries, dwarf bulbs	The practical minimum on open soil, where roots can also reach down into the ground below.
45 cm (18in)	Most vegetables — carrots, courgettes, beans, leeks, brassicas	The comfortable all-rounder. The RHS recommends 45cm or more for the majority of plants.
60 cm (24in)	Deep-rooting crops, fruit bushes, and any bed on paving or concrete	If the bed sits on a hard surface, give roots at least 45cm and ideally 60cm to grow into.

What to build a raised bed from

Timber is the usual choice: cheap, easy to work and forgiving if you are not a carpenter. The honest options, from cheapest to longest-lasting:

Scaffold boards and reclaimed timber — the budget route. Solid, wide and often free or cheap second-hand. They will not last forever untreated, but they get you growing this season.
Pressure-treated timber — the best value over time, as it resists rot for years. A common worry is chemical leaching: the RHS is clear that modern wood treatments no longer contain arsenic or chromium, so pressure-treated timber is considered safe for growing food. If you would still rather not, line the inside of the boards with polythene, leaving the base open.
Railway sleepers — handsome and almost indestructible. Buy new or untreated sleepers for a food bed; avoid old creosote-soaked ones, which can taint soil.
Pallet collars — four hinged boards that drop over a pallet base and stack for extra depth. Cheap, quick, and easy to store flat over winter. Treat them with a water-based preservative to make them last.
Brick, stone, metal and recycled-plastic boards — more permanent and more expensive. Recycled-plastic boards never rot and suit a low-maintenance plot.

The budget build

You do not need a kit. Four scaffold boards, eight corner stakes or a set of corner brackets, and an afternoon will give you a 2.4 x 1.2m bed for the price of the timber. Pallet collars are even quicker and can often be had free from local trade yards. Spend the money you save on good compost — that is where it does the work.

Where to put a raised bed

Most vegetables want full sun, so site beds in the sunniest, most sheltered part of the garden, away from the shade of trees and large hedges. Aim for at least half a day of direct sun. If you have a run of beds, orient them roughly north to south so neither shades the other through the day.

Leave proper paths between beds: at least 45cm so a wheelbarrow fits, and a metre if anyone needs wheelchair access. On grass, you can skim off the turf and set the bed down; the worms will do the rest. On a hard surface such as a patio, line the base with a permeable membrane so soil cannot wash out but water can still drain away, and give the bed extra depth to make up for the lack of ground beneath.

How to build a raised bed, step by step

This is a half-day job with basic tools. The method below makes a classic 2.4 x 1.2m timber bed.

Mark out the bed. Use pegs and string to set a 2.4 x 1.2m rectangle on your chosen spot. Check the corners are square by measuring the diagonals — they should match.
Clear and level the ground. Skim off turf or weeds and rake the soil roughly level. There is no need to dig the whole area.
Cut and join the timber. Cut boards to length, then fix the corners to stakes driven into the ground, or use corner brackets. Drive a stake every metre or so along the long sides to stop the boards bowing once they are full of soil.
Line it if you need to. Over grass, lay cardboard across the base to smother growth. On paving, lay a permeable membrane. You do not need to line the sides unless using reclaimed timber you would rather keep away from the soil.
Fill the bed. Add your soil mix (see below), heaping it slightly proud as it will settle. Water it in and let it stand for a few days before planting.

What to fill a raised bed with — and what it costs

Fill a raised bed with roughly two-thirds quality topsoil to one-third garden compost or well-rotted manure. Topsoil gives structure and holds water; compost feeds the plants and the soil life. Gardeners’ World suggests a mix of topsoil, organic matter and a little sharp sand for drainage. The compost-heavy top is where roots feed, so that is where to put your best material.

How much soil do you actually need

Work out the volume in litres: length x width x depth in metres, then multiply by 1,000. A 2.4 x 1.2m bed filled to 30cm deep is 2.4 x 1.2 x 0.3 = 0.864 cubic metres, or about 860 litres. That is the number that decides the cost.

A real cost, two ways

All bought, in bags: 860 litres is about seventeen 50-litre bags. At £4–£8 a bag for topsoil and multipurpose compost, that is roughly £70–£140 for one bed.

The cheaper way: bulk topsoil delivered by the cubic metre works out far less than bagged, and you can fill the bottom third with bulky free material — cardboard, autumn leaves, grass clippings, old compost, even rotten logs — and reserve your bought compost for the top 15–20cm where roots actually feed. This layering can halve the bill on a deep bed. Expect the level to drop as the lower layers break down, and top up next autumn.

The no-dig option

No-dig is the lowest-effort way to run a raised bed: you never dig the soil over, you mulch the surface with compost each year and let the worms do the work. It suits raised beds perfectly. To start a no-dig bed on grass or light weeds, lay cardboard over the ground and spread about 15cm of compost on top — roughly 150 litres per square metre. For established grass or stubborn weeds, double the cardboard and use around 20cm of compost. After that, an annual 5cm autumn mulch keeps the soil fed; do not dig it in. Beyond less work, no-dig means fewer disturbed weed seeds and steadily healthier soil.

What to grow in a raised bed

The best crops for raised beds are the quick, generous and shallow-rooted ones — salad leaves, radish, beetroot, courgettes, beans and chard — ideally things you genuinely like to eat. Radishes are the speediest of all, ready in as little as four weeks. If you are new to it, start with these:

Salad leaves and rocket — sow little and often as cut-and-come-again; weeks of picking from one short row.
Radish — the four-week crop; ideal for children and impatient adults alike.
Beetroot and carrots — easy roots for a deeper bed; beetroot is forgiving and you can eat the young leaves, while carrots reward the fine, stone-free soil a raised bed gives them.
Courgettes — one or two plants will feed a family all summer; give each plenty of room.
French and runner beans — grow up a wigwam of canes to use the height as well as the ground.
Chard — handsome, hardy and crops for months.
Potatoes — a satisfying first crop, and a good way to break in new soil.

A workable plan for one 1.2 x 2.4m bed: salad and radish at the cool end, roots in the middle, a courgette and a wigwam of beans at the sunny end.

A shortcut for the first year: if you have missed the sowing window or fancy a head start, young plug plants take the guesswork out. Gardening Direct stocks beginner-friendly vegetable plants and plug plants — tomatoes, courgettes, beans, herbs and seed potatoes — delivered ready to plant out. Seed is cheaper if you have the time; plugs buy you a few weeks.

Disclosure: that is an affiliate link. If you buy through it we may earn a small commission, at no extra cost to you. It does not change the advice here, which stands either way.

Spacing, companion planting and rotation

Because you harvest a raised bed from the edges and never compact the soil, you can plant a little closer than the seed packet suggests — the rule of thumb is about a 20 per cent reduction in spacing. That extra density is part of why beds are so productive.

Companion planting means growing plants that help each other. The classic example is the Three Sisters — sweetcorn, climbing beans and squash — where the corn supports the beans, the beans feed the soil, and the squash shades out weeds. On a smaller scale, a few French marigolds among the tomatoes and beans earn their place.

Crop rotation means not growing the same family of vegetables in the same spot two years running, which helps keep pests and diseases from building up. With a few beds it is easy: move your potatoes, your beans, your roots and your brassicas round by one bed each year. A three- or four-year cycle is ideal, but even a simple swap is better than nothing.

Frequently asked questions

How deep should a raised bed be for vegetables?

For most vegetables, aim for at least 45cm (18in) of depth. Salad leaves, radish and other shallow-rooted crops manage in 30cm, especially over open soil. If the bed sits on paving or concrete, give roots 45–60cm, as they cannot grow down into the ground beneath.

How wide should a raised bed be?

About 1.2 metres, so you can reach the centre comfortably from either side without standing on the soil. Against a wall, where you can only reach from one side, halve that to around 60cm. Length is up to you.

What is the cheapest way to fill a raised bed?

Layer bulky free material — cardboard, autumn leaves, grass clippings, old compost or rotten logs — in the bottom third, then top with bought topsoil and compost where the roots feed. Buying topsoil in bulk by the cubic metre is far cheaper than bagged. This can roughly halve the cost of a deep bed.

Is pressure-treated timber safe for vegetable beds?

Yes. The RHS confirms modern wood treatments no longer contain arsenic or chromium, so pressure-treated timber is considered safe for growing food. If you would still rather keep soil off the wood, line the inside of the boards with polythene and leave the base open. Avoid old creosote-treated sleepers.

What grows best in a raised bed?

Quick, shallow-rooted, generous crops do best: salad leaves, radish, beetroot, courgettes, French and runner beans, chard and potatoes. Start with two or three you like to eat rather than trying to grow everything at once.

Do raised beds need a bottom?

No. An open base lets roots reach down and worms move up, and it drains freely. Only line the base when the bed sits on a hard surface, and then use a permeable membrane so water can still escape.

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