Lasagna gardening is building a garden bed in layers, like a lasagna: alternating layers of nitrogen-rich greens and carbon-rich browns, laid over cardboard on the ground, and topped with compost. You do not dig, you do not remove turf, and you do not need to buy soil. The layers break down over a few months into rich, loose soil, and you plant into the top of the bed. It is a forgiving, low-cost way to make a new bed, and it is especially useful on poor soil, on a lawn, or on ground that has never been gardened. This guide explains what to layer, in what order, and how to plant into the result.
The name comes from the layering, not from the food. Each layer has a job: the cardboard smothers weeds and grass underneath, the greens feed the organisms that break the bed down, the browns give structure and carbon, and the compost on top is what you plant into. The layers are wet as you build them, so they start breaking down immediately, and by the time the bed has settled, the layers have merged into a dark, crumbly soil that worms love. It is the same principle as no-dig gardening, built up in layers rather than laid down in one compost blanket.
What to layer — greens and browns
Greens are nitrogen-rich and wet: grass clippings, vegetable peelings, fresh weeds without seeds, coffee grounds, and well-rotted manure. Browns are carbon-rich and dry: autumn leaves, straw, shredded cardboard and newspaper, sawdust, wood chips and twigs. The balance matters: too many greens and the bed goes slimy and smelly, too many browns and it breaks down very slowly. A good aim is roughly one part green to two or three parts brown by volume, the same balance as a compost heap, because a lasagna bed is, in effect, a compost heap that you plant into. Our compost ratio guide covers the balance, and the compost ratio calculator works it out for what you have. Our composting basics guide covers the process that breaks the layers down.
Do not layer meat, fish, dairy, fats, cooked food in quantity, dog or cat waste, diseased plants, weeds with mature seeds, invasive roots such as bindweed or couch grass, treated timber, or glossy paper. A lasagna bed does not get as hot as a well-managed compost heap, so it will not kill weed seeds or disease organisms reliably, and anything risky that goes into the bed will come back when you plant into it. If you are unsure about a material, leave it out and check your local extension service for advice.
How to build a lasagna bed
1. Choose the site and mark it out. Pick a sunny spot, and mark a bed 1.2 metres wide so you can reach the middle from either side without stepping on it. Cut down tall weeds, but do not dig and do not remove turf — the bed will smother it.
2. Lay cardboard. Cover the ground with plain cardboard, overlapping the sheets so there are no gaps, and wet it thoroughly. Remove tape and staples, and avoid glossy or plastic-coated cardboard, which does not rot. Two layers are better than one on weedy ground.
3. Add a green layer. Spread a layer of greens 5 to 8 cm deep on the cardboard, and wet it. Grass clippings are the most common green, but add them in thin layers mixed with browns, because a thick layer of grass alone goes slimy.
4. Add a brown layer. Spread a layer of browns 8 to 10 cm deep on top, and wet it. Shredded leaves, straw and shredded cardboard are all good browns. Press the layer down lightly so it settles.
5. Repeat. Alternate greens and browns until the bed is 45 to 60 cm high. It will settle to about half that height as it breaks down, so build it higher than you think you need. Wet each layer as you go: the bed should be damp throughout, like a wrung-out sponge, not wet and not dry.
6. Top with compost. Finish with a layer of mature compost 7 to 10 cm deep. This is what you plant into, so it needs to be fine, dark and crumbly. Mulch the surface if you like, and leave the bed to settle. The soil volume calculator works out how much compost you need for the top layer.
When to build and when to plant
A lasagna bed built in autumn is ready to plant in spring, because it has had months to break down over winter. A bed built in spring can be planted sooner, but only with transplants planted into the compost top layer — seeds sown directly into a fresh lasagna bed may struggle, because the layers below are still breaking down and can use nitrogen, and because the surface is coarse and uneven. If you need to plant a spring-built bed immediately, make the compost top layer deeper — 15 cm or more — and plant transplants, not seeds. By the second year, the bed will have settled into a deep, rich soil that grows anything. Our winter soil preparation guide covers the winter side of bed building, and the raised bed gardening guide pairs well with lasagna gardening, because a lasagna bed is often built inside a raised bed frame to hold the layers in place.
In winter, a lasagna bed should be left alone to break down. Do not walk on it, do not dig into it, and do not add fresh layers in the depths of winter when nothing is breaking down — add material in autumn, when the organisms are still active, and let the cold do its work of freezing and thawing the layers. Frost dates vary even within a zone, so treat the timing in this guide as a general guide and check your local extension service for your area.
Planting into a lasagna bed
Plant transplants into the compost top layer, making a hole with your hand, setting the plant in, and firming gently. For larger plants, cut through the layers below if you need to, but do not dig the bed over. Water well after planting. For seeds, wait until the bed has settled and the top layer is fine and even, or sow seeds in pots and transplant them in. Root crops need a deep, settled bed: do not sow carrots or parsnips into a fresh lasagna bed, because they will fork when they hit a coarse layer. Grow them in the second year, when the bed has become a uniform soil. Our growing carrots and growing tomatoes guides cover the crops, and the succession planting guide covers replanting each part of the bed as it is harvested.
Feed the bed each year with a layer of compost on the surface, and let the worms pull it down. Do not dig it in. Weed little and often, pulling weeds while they are small, and keep the surface mulched so weeds have less chance to start. Our winter mulching guide covers mulch materials, and the mulch calculator works out how much you need.
Pros and cons of lasagna gardening
The advantages are that it needs no digging, no turf removal and no bought soil, it turns waste material into a garden bed, it improves poor soil, and it is cheap if you have the materials. The disadvantages are that it needs a lot of material to build, it takes months to break down before it is at its best, the first year can be disappointing for seeds and root crops, and a bed built with the wrong balance can go slimy or break down very slowly. It is a slow method, and it rewards a gardener who can wait. If you need a bed this weekend, a raised bed filled with bought soil is faster. If you can wait a season, a lasagna bed is cheaper and, in the long run, just as good.
Common mistakes
The most common mistake is building the bed too low, so it settles to almost nothing and there is not enough depth to plant into. The second is too many greens, so the bed goes slimy and smelly. The third is gaps in the cardboard, so weeds push through. The fourth is planting seeds and root crops into a fresh bed, where they struggle. The fifth is adding diseased material or seeding weeds, which survive because the bed does not get hot enough to kill them. The sixth is walking on the bed and compacting it. And the seventh is expecting a first-year bed to perform like an established one — it will improve year by year, but the first year is the hardest. If you are unsure about materials or timing in your area, check your local extension service for advice.
Frequently asked questions
How long does a lasagna bed take to be ready?
A bed built in autumn is usually ready to plant in spring. A bed built in spring can be planted with transplants into the compost top layer straight away, but it will not be at its best until it has had a season to break down. Root crops should wait until the second year.
What can I use for the brown layers?
Autumn leaves, straw, shredded cardboard and newspaper, sawdust, wood chips and twigs. Shred or chop large material first, so it breaks down faster. Avoid glossy paper and treated timber.
Do I need to remove grass before building a lasagna bed?
No. Cut it short, lay cardboard over it, and build the layers on top. The grass and weeds underneath will die and rot, and feed the soil as they break down. The cardboard is what smothers them, so overlap it well and leave no gaps.
Can I plant straight into a new lasagna bed?
You can plant transplants into the compost top layer, especially if the top layer is deep. Do not sow seeds directly into a fresh bed, and do not grow root crops in the first year — wait until the bed has settled into a uniform soil.
Is lasagna gardening the same as no-dig gardening?
They share the same principle — do not dig, feed the soil from the surface, and let worms do the work — but lasagna gardening builds a bed from many alternating layers, while no-dig usually lays cardboard and a single blanket of compost. A lasagna bed is often built inside a no-dig or raised bed system.