They say that you can start harvesting when the plants are blooming, and my Carolas are blooming now.
They're pretty little flowers, aren't they? I actually planted these Carolas last year. But I forgot what I planted so I never harvested any potatoes. Luckily, they overwintered and started growing again this year.
It's good to know they'll overwinter, because I'll want to grow them again next year.