How do you tell if a potato is determinate or indeterminate?

Online Answer
You cannot tell if a potato variety is indeterminate or determinate by looking at an eye or sprout. Most potatoes that we grow are determinate. Some varieties such as Russet are indeterminate but not widely planted.
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Potato types: determinate and indeterminate We have mostly grown Red Pontiac, Yukon Gold and Kennebec. They all seem to be determinate varieties — they grow as a bush, then flower and die.
Determinate potatoes rarely grow very tall and are often early to bloom. However, if the plant's stems just keep growing up and up, it's indeterminate, a fact you can confirm by mounding the stems and checking to see if new tubers form in the added layer.
You cannot tell if a potato variety is indeterminate or determinate by looking at an eye or sprout. Most potatoes that we grow are determinate. Some varieties such as Russet are indeterminate but not widely planted.
Indeterminate varieties have leaves that are spaced out more and look more like vines. Check the flowers and fruit production. If the tomato plant is flowering all at once and producing all of its tomatoes at the same time, then it is a determinate tomato..