I usually grow my spuds in cages. When I harvested the last of the spring summer crops in late summer, there were a few seed potatoes left over in the ground that I was too lazy to dig up or try and catch (they were tiny and rolled everywhere and got lost in the compost and tangle)..
Now they've turned into a thriving winter crop despite the fact that Tasmania has had its coldest opening to winter on record, the heavy frosts and black ice have been coming night after night and even the occasional drift of snow.
Yesterday I started harvesting them - lots of nice medium sized spuds. What a bonus!

The vines are still looking healthy.
My fully exposed tomatoes also continued to thrive and fruit until about 3 weeks ago when I pulled the last of them out as I needed the pots. Go figure.
If you want to be happy for a day, buy a car. If you want to be happy for a weekend, get married. If you want to be happy for a lifetime, be a gardener.