Raised Bed Vegetable Gardening: Building, Filling and Planting Your Beds

Raised bed vegetable gardening gives you warmer, better-drained soil in a bed you never walk on, so building, filling and planting your beds well produces more food from less space.

A raised bed is simply a frame filled with good soil. It suits heavy clay, poor ground and small gardens, and it’s easy to reach and easy to protect. This guide covers the size, materials, soil mix, planting plan and care that make a raised bed vegetable garden productive. It’s general information, and your local extension service or the Royal Horticultural Society (RHS) can add advice for your soil and climate.

It belongs to the Vegetables and Herbs guides and works with How to Start a Vegetable Garden, Container Vegetable Gardening and Companion Planting.

Raised bed vegetable gardening at a glance

These are typical values. Your site and crops may need slightly different sizes, so check what suits your soil and climate.

Where to put raised beds and what to build them from

Choose a level spot with at least 6 hours of sun, shelter from strong wind and a tap within reach. Tomato, pepper and bean need sun, while lettuce and spinach tolerate partial shade. Avoid placing beds under large trees, because roots from willow, birch or maple invade and steal water. Cedar and larch resist rot for years, and recycled plastic boards last longest. Avoid old railway sleepers and wood treated with CCA, which can leach chemicals. A bed of 30 cm depth also suits root crops such as carrot and beetroot.

How to build and fill a raised bed step by step

1. Mark and level. Peg out a 1.2 m wide rectangle and level the ground with a rake.
2. Lay cardboard. A layer over the grass smothers weeds and rots down, while worms pull it into the soil.
3. Build the frame. Screw boards at the corners with stakes of 5 cm wood inside. Use 20 to 30 cm height.
4. Add coarse material at the base if you wish. A thin layer of small branches saves soil, but isn’t needed in a shallow bed.
5. Fill with the mix. Use about 60% loam, 30% compost and 10% grit, in layers, and fork them together lightly.
6. Water and settle. Let it rest for a week, then top up. Soil settles by 2 to 3 cm.

How raised bed soil affects vegetables, water and feeding

Loam holds water and feeds roots, while sand and grit drain heavy mixes, and compost feeds tomato, pepper and squash and improves clay and loam. Mulch protects soil and reduces evaporation by up to 50%. Raised soil warms early, so lettuce, spinach and pea sprout sooner, but it dries faster, which means deep watering twice a week. Bean and pea fix nitrogen that cabbage uses next year, and gravel or copper tape blocks slugs that damage lettuce and bean while ladybird controls aphid on bean.

Carrot needs deep, stone-free loam, whereas radish suits shallow soil, and onion and garlic need sun and loose ground. Basil attracts bee near tomato, marigold repels whitefly, and nasturtium draws aphid away from squash. Top up with 3 cm of compost each spring because plants feed on it and it settles, and rotate crops every 3 years because blight attacks tomato and potato in damp weather.

Planting a raised bed densely

Dense planting shades the soil and reduces weeds, but crowded plants need feeding and watering. Plan the bed on paper, with tall crops on the north side so they don’t shade the rest.

Which crops suit raised beds best

Beans, courgettes and potatoes take more space, so give them their own bed or grow them upward on a frame. If you’re short of room, start with salad, herbs and a couple of tomato plants.

Protecting a raised bed from pests and weather

A hoop of 60 cm height with netting stops birds and cabbage white butterflies, and fleece of 30 g protects seedlings from a late frost. Copper tape or a gravel edge blocks slug and snail, and a frog pond nearby attracts frog that eat them. Marigold repels whitefly near tomato, and garlic repels aphid near rose and lettuce. Mulch reduces blight on tomato by stopping soil splash, and clean tools protect plants from disease. You can walk the beds each evening for 5 minutes, and you’ll catch most pests early.

Raised bed care through the year

• Spring: top up with compost, then sow lettuce, spinach and pea once the soil reaches 5°C.
• Summer: water deeply, mulch, and feed tomato and pepper every 2 weeks.
• Autumn: clear spent crops, sow garlic and cover bare soil with mulch or a green manure.
• Winter: protect crops with fleece or a cloche, and avoid walking on the soil.

A drip line of 2 litres per hour per emitter keeps moisture steady. You can check the soil with a finger 5 cm down, and you’ll water only when it feels dry. Your extension service or the RHS lists local sowing dates.

Common mistakes

• Making the bed too wide. You end up stepping on the soil and compacting it.
• Filling with pure compost. It sinks and burns young roots.
• Using unsafe timber. Avoid old sleepers and CCA-treated wood.
• Forgetting to water. Raised beds dry out fast in summer.
• Growing the same crop each year. Rotate families every 3 years to reduce disease.

For what to look for in a bed kit, see Best Raised Bed Kits.

Next steps

Mark out one bed this weekend and fill it before the planting season. Read How to Start a Vegetable Garden for crop choice, Companion Planting for pairings and Harvesting and Storing Vegetables for the payoff. The Vegetables and Herbs guides link every step.