Cardboard vs Newspaper for No-Dig: Which Kills Grass Faster?
Every no-dig garden starts the same way: a layer of paper on the ground, a layer of compost on top, and a few months of patience while the grass underneath dies. The classic question is which paper — cardboard or newspaper. Both work, and both are essentially free, but they behave very differently under the compost, and the choice matters more than most beginners expect.
This comparison is based on how the two materials actually perform in no-dig beds, as reported consistently by gardeners who use both. There is a clear winner for speed, a clear winner for budgets, and a strong case for using them together.
At a Glance
- Winner for killing grass fast: Cardboard — a single thick layer smothers turf quickly and reliably.
- Winner for budgets and light weeds: Newspaper — free, easy to source, and fine for suppressing annual weeds.
- Best overall approach: Use both — cardboard in heavy-traffic areas and seams, newspaper in between.
How They Compare
Kill speed: cardboard wins
Cardboard is thick, opaque, and holds its structure for months, which is exactly what it takes to starve grass of light. A single layer of corrugated cardboard reliably kills turf within four to six weeks in most conditions. Newspaper works by the same principle, but because it is so much thinner, you need five to eight layers to reach the same opacity — and even then, vigorous grass can push through thin or overlapping spots. For established lawn, cardboard is the faster, more reliable kill.
Ease of sourcing: newspaper wins
Newspaper is free and endlessly available — neighbors, coffee shops, and recycling bins keep most of us supplied for life. Cardboard is also mostly free if you save shipping boxes, but you need a lot of it, and a big bed can take every box you have ever owned. In practice, most people run out of cardboard and finish the bed with newspaper. Our no-till guide walks through the full build if you are new to the method.
Breakdown speed: newspaper wins
Newspaper breaks down quickly — within a few months it is well on its way to becoming soil, which is good for the worms and good for root penetration. Cardboard takes longer, often six months to a year in cool conditions, and some gardeners find a thick, overlapping cardboard layer still visible at the end of the first season. That slower breakdown is a feature if you want long weed suppression and a mild inconvenience if you want to plant deep-rooted crops early.
Contaminant risk: roughly a tie, with caveats
Modern newspaper inks are soy-based and widely considered safe for gardens. Cardboard is also generally safe, but you must remove tape, labels, and plastic reinforcements — and avoid glossy, coated, or heavily printed board. Cardboard is more likely to come with tape and stickers; newspaper’s risk is glossy inserts, which should be pulled out before you lay the pile.
Weed suppression over time: cardboard wins
Because it is thicker and slower to decompose, cardboard keeps suppressing weeds for a full season and often into the next. Newspaper loses its integrity after a few months, and weeds — especially creeping perennials like Bermuda grass and bindweed — exploit the gaps as it breaks down. If your ground is weedy, cardboard is the stronger barrier; our weed suppression guide has more on handling aggressive perennials.
Cost: a tie (both are free)
Both materials cost nothing if you collect them. The only cost difference is time and storage: cardboard is bulkier to hoard, while newspaper stacks neatly in a corner. Neither is worth buying, but if you do buy, plain corrugated sheets are the only purchase that makes sense — large cardboard sheets on Amazon or kraft paper rolls for the newspaper role.
How to Use Them Together
The smart play is a hybrid:
- Lay cardboard over the grassiest, weedy-est parts of the bed — the perimeter and any known trouble spots.
- Fill the middle with four to six layers of overlapping newspaper.
- Overlap every seam by at least 4 inches, whatever the material.
- Soak everything thoroughly, then pile on 4 to 6 inches of compost.
This gives you cardboard’s strength where you need it and newspaper’s quick breakdown everywhere else, at a total cost of nothing. Finish with a straw mulch to hold moisture, and the bed is ready to plant.
FAQ
How many layers of newspaper do I need?
Five to eight overlapping sheets for general weed suppression, and more — up to a dozen — if you are laying it over live grass. Wet the layers as you go so they bed down into the ground, and overlap the edges like shingles so nothing sneaks through.
Does cardboard slow down root growth?
Not meaningfully in a no-dig bed. The compost layer is 4 to 6 inches deep, which is enough for most transplants and seeds to establish before their roots reach the cardboard — and by the time they do, the cardboard is already softened and breaking down. Worms and moisture keep it penetrable.
Can I use cardboard boxes with shipping tape still on?
No — remove all tape, labels, and plastic first. Tape does not break down and will surface in your soil as stubborn scraps for years. It takes a few minutes per box and is worth every second. Glossy, coated, or heavily printed cardboard should be skipped entirely.
Is newspaper ink safe for a vegetable garden?
Yes for modern newspaper. Since the early 2000s, most mainstream newspapers print with soy-based inks, and the paper itself is fine to compost or lay under a garden bed. Pull out any glossy color inserts — those use a different printing process — and you are good to go.
Bottom Line
If you are killing lawn, reach for cardboard: it is thicker, faster, and keeps suppressing weeds longer. If you are on a budget or just suppressing annual weeds, newspaper in generous layers does the job for free. The best no-dig beds use both — cardboard where the weeds are worst, newspaper everywhere else, all soaked and buried under a good depth of compost. Either way, you are building soil instead of digging it, and the worms will handle the rest.
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