Mine are now getting really big! I planted Roseval reds and Sirtema, in March and also made a spud bin in a big black tub. Those are doing great.
I also had some mystery spuds, left from the last lot owner! I just dug some of those up accidentally while digging over, the plants were small and growing among the weeds, but there were tiny baby potatoes! I steamed them, they were gorgeous. My first crop, and not even my doing ha ha.
The others are now about 30 cm tall, I didn't earth them up but laid a thick layer of straw, they look so neat and pretty now.
I admit that there were a few strays here and there, and in fact I have left them in and let them grow. There is one among the garlic, another among the lettuce and a third with the onions. I figure I will leave them in and just dig them up when I harvest those things, I don't expect they will do much harm to the lettuce. It is a kind of bonus! So I say thank you to teh garden for giving me a few free veg by leaving them in. I am kinda sentimental that way ;D I also collected all the Johnny Jump Up wild pansy and planted them together in the flower bed, they look great.