Some potato varieties frequently flower, others flower infrequently, some not at all. It is very variety dependent, and many are very picky with the conditions they want before they flower. Heat/cold, drought/water, amount of sunlight, short/long daylength, shade, etc. Lots of factors involved.
I have grown Kennebec, but not Red Lasoda. Kennebec flowers infrequently for me, and sets occasional berries. I have not grown out the true seed from Kennebec. I seem to recall that they flower more frequently later in the summer.
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