What do you do with the big mammajamma containers that trees or large shrubs are delivered in from the nursery? Well you could recycle them if they’re made of #2 plastic, but many are made of #5 or something and unable to be recycled (at least at our recycling center) and in anycase reuse is better than recycling.
When you buy potato sets (aka seed potatoes) you get a whole bunch. More than what most home gardeners need. You can plant some in trash cans, I do, but I plant the left overs in this nursery pots and it works. The dark plastic of the pots absorbs heat and helps them grow. You put about 4 inches of compost or potting mix in the pots, add your potato sets (4 or 5), cover, and as the potatoes grow keep adding soil each time they peak out, this “hilling up” allows the potato to hopefully form more spuds along the stem.
Then, to harvest, you just dump out the pot, no need to worry about accidentially wounding a spud with your shovel.
This year I’m growing “All Blue” potatoes, they’re purple in color and have some of the same antioxidants as blueberries. They taste the same as others, but are better for you.