This is either a Purple Majesty or Mountain Rose potato flower. I planned them in the same raised row but keep forgetting which half of the row is which potato. However, after seeing yours I am being this is the Mountain Rose. I'll need to check if there are flowers on the other half of the row.My purple potato plant is beginning to bloom! Purple flowers to go with the purple stems! Variety is called "Blackberry".
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@BReeder! , have your purple majesty potatoes bloomed yet? Wonder what color flower it will have!