Every February I have a basket of empty toilet paper rolls sitting next to my basement shop lights, and every February someone asks whether folding them into pots is actually worth the fifteen minutes or just a Pinterest chore. Short answer: yes, for the seeds that hate having their roots disturbed. I've made hundreds of these over the years, and this is the exact fold I use, no tape, no stapler, nothing but the cardboard itself.
Start With What's Already in Your Recycling Bin
I keep a basket by the shower for exactly this. There's no material cost here, which matters because in a Boise zone 7a February I'm usually starting dozens of seedlings under my basement shop lights, and paying for peat pots on top of grow-light electricity adds up fast.
Stand the tube upright with the end you'll fold facing down, the way it's shown here. It doesn't need to be a specific brand or thickness of cardboard, just dry and not crushed. A slightly squashed roll will still fold, it just won't stand quite as square.
Marking Your Fold Lines
This is the step people skip and then wonder why their flaps come out uneven. Use a pencil, not a pen, and mark four evenly spaced lines about 1.5 inches (4 cm) long on one end.
- Space them roughly 90 degrees apart — eyeballing works fine, these don't need to be surveyor-precise
- Keep the lines the same length so all four flaps close at the same depth
- Mark before you cut — cutting freehand almost always drifts off-center
My eleven-year-old June can do this step in about ten seconds flat once she's watched me do it twice.
Cutting Along the Lines
Use sharp scissors and cut straight up each marked line to create four bottom flaps. Sharp is the operative word here — dull scissors crush the cardboard fibers instead of slicing them, and you end up with a ragged edge that tears further than you wanted.
If a kid is doing this part with you, this is the step to supervise directly, not the folding. My son Otto is in charge of the worm bin, not scissors duty, for exactly this reason.
Cut a hair short of your pencil line rather than past it — you can always trim more, but you can't un-cut cardboard.
Creasing Before You Fold
Gently fold each of the four flaps inward to make a clear crease at the bottom, then unfold them again before you start the final closure. This is the same trick as scoring a gift box before wrapping — a pre-made crease folds clean and flat, while a flap you're folding for the first time under pressure tends to buckle or split along the grain.
You're looking for the cardboard to hold a fold on its own, standing slightly proud, rather than springing back flat the second you let go.
Folding the First Flap Over
Choose any one of the four flaps and fold it flat across the bottom opening. It doesn't matter which one you start with — there's no front or back to a toilet paper roll.
This is the point where the pot starts to feel like it's actually going to hold soil rather than just sit there as a cardboard tube. It won't yet; one flap alone leaves plenty of gaps for potting mix to sift out the bottom, so don't fill it now.
Closing It Off, Two Flaps In
Bring the flap directly across from the first one over it. This is exactly the same move as closing a takeout box — two opposite flaps crossing to start pinching the base shut.
- Press the crease flat as you fold, not just at the corner
- Check for a straight-across seam before moving on — a crooked pair here means a lopsided pot later
At this stage the base is still soft and will pop back open if you let go, which is normal and expected — the last two flaps are what lock it.
One Flap Left to Tuck
Fold one of the two remaining side flaps inward so that only the last flap is left standing. You can feel the base starting to firm up here — three flaps overlapping gives the cardboard enough friction to hold its own weight, even before the final piece locks in.
If your base feels loose at this point, it's almost always because an earlier crease wasn't pressed flat. Go back and re-crease rather than forcing the last flap — it'll tuck in cleaner.
Tucking In the Last Flap
Slip the final flap into the small gap left by the others to lock the bottom shut and form a self-standing pot. No tape, no glue, no stapler — the four flaps overlap like the bottom of a paper grocery bag and hold themselves closed through friction alone.
The tighter your crease lines from Step 4, the more satisfying this last tuck feels — it should click into place, not need to be forced.
Set it upright on the counter and give it a gentle press-test. A well-folded base holds soil weight without collapsing.
Filling It, Planting It, and Timing It to Your Frost Date
Line these up in a tray so they support each other — a single one on its own can tip if it's bumped. Fill with a light seed-starting mix, not garden soil, and water gently so the cardboard is damp but not soaked; too wet too fast is how these go soft before germination even happens.
These are best for seeds that resent root disturbance — squash, cucumbers, melons, and sunflowers, in my own experience under the basement lights. Count back from your last frost date, not mine — I'm zone 7a and typically start these 3 to 4 weeks ahead, but check your own local extension office for your date.
Before planting into the bed, tear or slit the soggy bottom open. My alkaline, dry Boise soil doesn't break cardboard down quickly, and I've had roots stall against an intact base more than once.
It takes longer to read these steps than to actually fold one, and once your hands know the sequence you can knock out a tray's worth while the kettle boils. Mine are lined up under the shop lights right now, waiting on squash seed I haven't quite committed to yet.
- Materials
Seasonal & Flower Containers6 Fast Growing Flowers for Containers That Bring Quick, Colorful Blooms
Balcony & Patio Gardens16 Small Garden Ideas for Renters That Save Space and Look Beautiful
Herb Gardening9 Beautiful Herb Garden Design Ideas That Are Practical and Easy to Grow
Raised Bed Gardening10 Best Vegetables for Raised Garden Beds That Are Worth GrowingCommon Questions
Do the pots need to sit in a tray, or can they stand alone?
They're self-standing once the last flap is tucked, but I always group mine in a tray or shallow bin anyway. A single pot can tip if it gets bumped, and a tray also catches the water instead of soaking your counter.
How long do these last before they get mushy under grow lights?
In my basement setup, mine hold their shape for about 3 to 4 weeks with regular watering before the bottom starts softening. That's roughly the same window I'm using them for anyway, so timing works out.
Can I plant the whole roll into the garden without tearing it open?
You can, but in my dry, alkaline zone 7a soil I've seen roots slow down against an intact cardboard base. Tearing or slitting the bottom before you plant gives roots a faster escape route.
Is this sturdy enough for heavier seedlings like tomatoes?
It'll hold, but I don't bother — tomatoes transplant fine bare-root and don't need the root protection these pots are really for. I save this fold for squash, cucumbers, and other vining crops that hate disturbance.
