Why bother with no dig?

If you have ever spent a bright Saturday wrestling with a spade, turning over heavy clay and slicing through couch grass roots, you will know that digging is hard work with uncertain rewards. No dig gardening turns that on its head. Instead of disturbing the soil, you feed it from above and let the worms, fungi and bacteria do the hard graft for you.

The idea is beautifully simple. Smother whatever is growing with a layer of cardboard, then pile compost and well-rotted manure on top. Weeds beneath are starved of light, soil life migrates upwards into the new growing medium, and within a season you have a bed you can plant into with nothing more than a trowel. For a typical UK back garden or allotment plot, this is the fastest route from rough grass to a respectable vegetable patch — and you can start it almost any time of year.

Choosing a spot and marking out the bed

Pick the sunniest patch you have. Most vegetables want six hours of direct light a day, and in a British summer that sunshine is precious. Avoid the shade of a fence or a mature hedge, and stay clear of the roots of nearby trees and shrubs, which will happily steal moisture and nutrients from your new bed.

Keep beds no wider than 1.2 metres. That way you can reach the middle from either side without treading on the soil, which is the whole point. Once a bed is made, you never walk on it again.

Allow paths of 30–45cm between beds. Lay cardboard along the paths too, topped with woodchip, and you will keep the weeds down and give yourself somewhere dry to kneel. If you are converting a lawn, cut the grass short first — there is no need to strip turf or dig anything over.

Gathering your materials

You will need three things, and none of them needs to cost much:

• Cardboard: plain brown, with all tape, staples and plastic labels removed. Bike shops, furniture stores and supermarkets are usually glad to hand over large flattened boxes. Avoid glossy printed card and anything waxy.
• Compost: homemade if you have it, or a bulk bag of peat-free multipurpose. This is the layer your seeds and seedlings actually root into, so quality matters.
• Well-rotted manure: at least six months old, ideally a year. Fresh manure will scorch young roots and can carry weed seeds. If you are unsure, stack it for another few months before using it.

For a bed of roughly 1.2m by 3m, aim for around 15–20cm of material in total. That sounds like a lot, but it settles to about half its depth within a few weeks.

Building the bed in layers

Start by giving the ground a thorough soak if it is dry — damp cardboard rots down and knits together, while dry cardboard stays stiff and lets light through the seams. Then lay your cardboard over the whole bed area, overlapping each sheet by at least 15cm. Edges are where weeds sneak through, so be generous.

Soak the cardboard again once it is laid. It will hold the moisture in and help everything below break down.

Now barrow on your compost and manure, mixing them roughly as you go — roughly two parts compost to one part manure is a good starting point, though hungry crops such as brassicas and courgettes will thank you for a little more manure. Rake the surface level, but do not firm it down hard. A crumbly, open texture is exactly what you want.

If you are building in autumn, the worms will have pulled much of the organic matter down into the soil by spring. If you are starting in March or April, you can plant almost immediately — just be aware that the material will settle as the season goes on.

Planting up your new bed

Your first season is the easiest of all, because the fertility is right at the surface. Push a trowel into the compost, make a hole, and settle your plant in.

• Courgettes, squash and pumpkins: superb first-year crops. Make a small dip around each plant so water soaks straight to the roots, and give them plenty of room.
• Brassicas: cabbages, kale and sprouts love the rich ground. Plant firmly and net against pigeons straight away.
• Salads and leafy greens: sow direct in shallow drills, or raise in modules and transplant. They will romp away in that crumbly top layer.
• Potatoes: plant into the compost rather than digging trenches, then earth up with more compost as the haulms grow.

Beans, onions and root crops all do well too, though carrots and parsnips prefer a bed that has been settled for a season, as fresh manure can make the roots fork.

Looking after the bed through the season

Watering is the main job in a dry spell. Water deeply and less often, aiming for the base of the plants rather than the leaves, and check under the cardboard edges after heavy rain — sometimes it can shed water rather than absorb it.

Top up with a couple of centimetres of compost each autumn, and the bed will improve year on year without a spade ever touching it. Slugs can be a nuisance in the first few months as they work through the decaying material underneath, so keep an eye on young seedlings and clear any damp hiding places nearby. By the second season, the soil beneath will be dark, crumbly and full of worms — and you will wonder why anyone ever digs at all.