Does your office have a printer? Watch out for the packaging around toner cartridges. Does yours look like this?
Use it as a planter for seedlings. It’s made of compressed paper so should rot down nicely in the garden if you plant it directly in the soil.
Your seedlings may need to be inside for a while and obviously you won’t want soggy cardboard sitting around. So there is an ideal size container that you can use to house your seedling pot.
The large “value” packs of mushrooms come in large plastic containers these just fit perfectly round the seedling pots.
Now you can keep them snug and warm indoors until its time for them to go out.
2 recycles for the price of one 🙂 (plus you get to eat loads of yummy mushrooms!)