ornamental potatoes - do they resprout true to color

Saluda, SC(Zone 8a)

last year I had a bed of beautiful pink ornamental potatoes. I have been surprised this year with a bed of sprouts from potatoes apparently produced last year.

What I don't understand is why they are not pink but look like ordinary sweet potato vines. I thought sprouts from tubers would be a vegetative method of reproduction that should mimic the parent.

Can anyone answer that puzzle for me?

Kure Beach, NC(Zone 9a)

They could get the color you're expecting once they get older. Sometimes the new baby aren't the same as the mature ones.

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