Build your first no-dig bed, start to finish
Sample video: in the live course this plays the full walkthrough.
Here is the whole promise of no-dig in one sentence: you build a bed on top of the ground, not by turning it over. No fork, no tiller, no aching back, no weekend lost to breaking sod. You smother what's there, lay down compost, and plant into it. That's it. By the end of this lesson you'll have built one: over grass, over gravel, or over compacted hardpan.
The method works because you're not fighting the soil life, you're feeding it. Cardboard blocks the light so the grass and weeds below die off and rot down into food for worms. The worms pull that organic matter down and do the digging for you, for free, forever. Your job is just to start the process.
What you'll need
Materials for one 1.2m × 2.4m bed
- Cardboard: plain brown, enough to cover the whole footprint twice over. Remove all tape, staples, and glossy labels.
- Compost: roughly 0.3m³ (about 8–10 large barrow loads) of well-rotted compost or a compost/topsoil mix. Enough for a 10cm (4in) layer.
- A watering can or hose: you'll soak the cardboard as you go.
- A rake: to level the compost at the end. That's the only tool you need.
Don't overthink the compost source yet: the next lesson covers exactly how much you need and where to get it cheaply. For now, "well-rotted and dark and crumbly" is the target.
The steps
- Mow or knock down what's there. Cut grass and weeds as low as you can, or just tread them flat. You do not need to remove them: they become food. If it's gravel or bare hardpan, skip straight to the next step.
- Lay the cardboard, overlapping every seam by at least 15cm (6in). Gaps are where grass finds the light and pushes through, so overlap generously and take it right to the edges. This one habit prevents most no-dig failures.
- Soak the cardboard until it's dark and floppy. Wet cardboard beds down onto the ground, starts breaking down faster, and won't blow away while you work. Don't skimp here.
- Pile compost on top, 10cm (4in) deep across the whole bed. Tip it in barrow loads and spread as you go. Ten centimetres is the number that matters: deep enough to plant into, deep enough to keep light off the cardboard.
- Rake it level and water it in. Knock out the lumps, firm it gently, give it a final drink. The bed is finished.
- Plant straight away. You can sow or transplant into the compost the same day: the cardboard below is already doing its job. There is no waiting, no digging, nothing left to do.
That's a bed. Whether you laid it over a scruffy lawn, a gravel path, or ground so compacted you couldn't get a fork in, the process was identical: because you never touched the ground underneath.
Watch the edges and the seams in the first month. If you see a blade of grass appear, it found a gap in the cardboard, just lay a fresh overlapping piece and top it with a little more compost. Five minutes now saves an hour of weeding later. On gravel or hardpan, water the new bed a touch more often for the first few weeks; it can't yet pull moisture up from below the way a bed over soil will.
The two mistakes almost everyone makes
1. Skimping on compost depth. A thin 2–3cm scatter lets light reach the cardboard, so weeds survive and your seedlings have nothing to root into. Ten centimetres isn't a suggestion: it's the difference between a bed that works and one that disappoints you all season. If you can only afford to do it well over a smaller area, build a smaller bed.
2. Under-lapping the cardboard. Butting pieces edge-to-edge instead of overlapping leaves a hairline seam of light, and grass will thread straight up through it. Overlap every join like roof tiles. It costs you nothing and it's the single biggest predictor of whether your bed stays weed-free.
Before the next lesson: pace out where your first bed will go and write down its two measurements. Then answer one question in your workbook: what's underneath it: grass, gravel, or hardpan? That single answer tells you how much to water it in week one, and it's the first line of your bed plan.