Toilet roll cardboard tubes in the garden: practical uses for seedlings and soil

Across Europe and North America, more and more home growers are taking a second look at what they throw away. One unlikely hero of this back-to-basics change is the simple cardboard tube from a toilet roll, which is being reused as a small plant guard, a starter pot and even a way to improve soil.

Why an empty toilet roll suddenly matters in the garden

At first, a cardboard tube seems like pointless waste. Once it’s in contact with soil, though, it performs in a surprisingly useful way. Its fibres help retain moisture, protect delicate roots and, as the cardboard rots down, it contributes to the soil. For anyone coping with hot spells, slugs or beds that have become compacted, that small advantage can be the difference between crops failing and getting a respectable yield.

Cardboard tubes act like tiny biodegradable plant collars: they guide water, soften temperature swings and disappear into the soil.

Because cardboard is largely cellulose (a plant-derived material), it takes up water readily, rather like a sponge. After rainfall or watering, it absorbs moisture and then releases it little by little as the surrounding compost or soil dries. That steadying effect helps keep the root area more consistent than exposed soil, particularly in shallow raised beds, containers and balcony planters.

As the tube softens, it also becomes a food source for soil life. Microbes and fungi begin breaking down the outer layers, while earthworms pull small pieces downwards and mix them with minerals and organic matter. Rather than relying on extra plastic pots or synthetic membranes, gardeners get a modest boost of humus and a more open, crumbly top layer.

The tube’s ring shape has a practical mechanical benefit too. It reduces wind right at ground level, lowers surface evaporation and forms a narrow “well” that directs water down towards the stem instead of letting it spread across the bed and run away.

How gardeners are using toilet paper tubes right now

Seed starting without plastic pots

In the UK, the US and Germany, many small growers are arranging toilet paper tubes upright in trays or reused food cartons, then filling them with seed compost. Set close together, the tubes support one another so they don’t topple as the compost settles and seedlings emerge.

• Cut each tube into two or three shorter cylinders.
• Fit them snugly into a shallow tray or a halved milk carton.
• Add a loose, peat-free compost mix.
• Place one or two seeds in each tube and cover lightly.
• Water carefully, ideally from underneath so the compost doesn’t wash out.

Once seedlings reach four to six true leaves, gardeners can plant the whole plug out into the ground or a larger pot, cardboard included. Over time, roots push through the damp tube, which helps avoid the transplant shock that often happens when young plants are pulled from plastic modules.

Instead of disturbing young roots, the whole soil plug moves into the bed. The tube breaks down where the plant needs food most.

Slug, wind and cutworm defence for young plants

A second popular approach is to use the tube as a cheap protective collar for vulnerable stems. By cutting tubes into rings five to ten centimetres tall, then pressing them a couple of centimetres into the soil, gardeners form a rough, drier barrier that many slugs are reluctant to cross. It won’t stop every pest, but it can delay the first rush that so often wipes out newly planted lettuces and beans.

The same collar can also limit damage from cutworms-soil-dwelling larvae that chew through stems at ground level. A sturdier cardboard wall makes access harder, and plenty will move on to an easier target.

Where sites are particularly exposed-coastal allotments or balcony railings, for example-the ring can also support thin, leggy stems and lower the risk of a sudden gust snapping the plant close to the soil surface.

Mulch and compost: the second life of every tube

After tubes start to collapse, many gardeners cut them into strips and treat them as a dry “brown” ingredient. Sprinkled around plants (without being pressed directly against the stem), the pieces can:

• keep the soil surface shaded from strong sun, reducing evaporation,
• form a light-blocking layer that helps deter some weeds,
• provide carbon as they decompose, balancing nitrogen-rich kitchen waste.

In compost heaps, shredded toilet and kitchen-roll cardboard helps solve a frequent city-garden issue: heaps that are heavy on wet peelings but short on dry, airy structure. Mixed through food scraps, tubes absorb excess liquid, reduce odours and create air spaces so microbes can work efficiently and the pile can heat up as it should.

What to use – and what to skip

Not all bathroom packaging is suitable for soil. Many gardening advisers recommend only plain, uncoated cardboard. Tubes with heavy printing or a glossy finish may contain inks, adhesives or thin plastic coatings that take longer to rot and could introduce unwanted chemicals into beds used for food.

Type of tube	Garden use	Notes
Plain brown toilet roll tube	Seed pots, collars, mulch, compost	Best option; breaks down quickly
Coloured or heavily printed tube	Compost only, in small amounts	Choose if dyes are labelled as water-based
Glossy or coated tube	Avoid	May contain plastics or slow-to-rot coatings

Growers also caution against fitting tubes too tightly around stems. Plants still need airflow so they can dry after rain or watering. If cardboard sits right against the stem, persistent damp can encourage fungal problems. Leaving roughly a finger’s width of space all the way round is usually enough.

How this tiny habit fits a bigger shift in gardening

Reusing toilet paper tubes is part of a wider swing towards gardening that is cheaper and creates less waste. With the rising cost of plastic pots, peat-based composts and branded pest barriers, many people are reassessing what’s already available at home.

The most effective garden hacks often start with ordinary rubbish, reimagined as tools.

Community allotments from Manchester to Milwaukee are reporting increased interest in “no-dig” and regenerative methods, where attention moves from feeding plants to feeding the soil. Cardboard-including tubes-fits neatly into that thinking as a straightforward carbon source that works well at small scale in containers, raised beds and other tight spaces.

Environmental organisations point to another upside: reduced reliance on single-use plastics. Seed trays and plug packs are often difficult to recycle once they’re cracked or dirty. Although biodegradable pots exist, they cost more than many renters or community gardeners want to spend. Toilet-roll tubes, on the other hand, turn up weekly in most households and typically go straight into the bin.

Risks, limits and when not to rely on cardboard tubes

Tubes are not a miracle solution. In very wet regions or in poorly drained clay, extra cellulose sitting near the stem can keep the plant base too moist. That can favour slugs, mould and rot. In such conditions, tubes tend to be more useful as seed-starting pots that are planted into raised beds or containers, rather than directly into heavy ground.

There’s also a question of scale. A handful of tubes is ideal for a balcony or a small urban plot. A market gardener raising thousands of seedlings will rarely generate enough household tubes to keep up and may opt for commercially produced biodegradable trays instead.

Some people with chemical sensitivities prefer not to use printed cardboard near edible crops, even when inks are marketed as plant-based. In that case, only plain, unlabelled tubes are used in veg beds, while other cardboard is kept for ornamental borders or for mulching paths.

Practical tips to test the toilet roll cardboard tubes method at home

Anyone who wants to try it can run a simple two-row comparison. Start tomatoes, beans or marigolds in matching quantities. Use cardboard tubes for half, and standard plastic cells or open seed trays for the rest. Plant everything out on the same day, water the same way and note:

• how many seedlings make it through transplanting,
• how quickly they establish roots and produce new growth,
• whether wind or slugs cause more losses in one set than the other.

Keeping even a basic notebook for six to eight weeks will show whether tubes improve survival in your own conditions. Because soils and weather vary so much, a small home test often gives clearer answers than general guidance from books or social media.

Parents and teachers are also turning tube planting into an inexpensive classroom project. Children can decorate the outside with colouring pencils, write their name on each tube and observe root development when the plug is lifted gently. Seeing how stems, roots and soil affect one another often lands better than a worksheet.

For gardeners who already spread coffee grounds, eggshells or kitchen scraps on their beds, tubes slot naturally into the same approach. They add structure, give young plants a better start and cut waste without extra spending or complicated kit. Next time a roll runs out in the bathroom, the question is increasingly straightforward: bin, or bed?