no problem, if you see potatoes cover them others wise let em go!

Normally you just mound up to about 12-14 inches max. Varies with variety but very few will produce spuds any higher than that. Yours will be fine. Have fun digging them out of all that mounding.

Dave

Dave,

Supposedly, they will produce potatoes all along the stem if it is covered in dirt or similar. That's the idea behind potato towers. I didn't have any luck but some people claim to get a lot of pounds from one plant.

Mike

bin again, shall we part 1

part 2

part 3

Excellent point Mike, thanks! - I didn't even think about towers. Just assumed the OP was talking about normal in-ground hilling in which case 16-18" from planting depth is fairly normal. A 4 foot tall mound would be an interesting picture. ;)

And of course it does depend on the variety too since some of the early varieties like Yukons will only develop potatoes high in the hill rather than at the root level.

Dave

Potato plant has LIMITED amount of resources.By mounding for ever or towering
you cannot make them grow more tubers than they could/would.

Most of the tubers will grow just above the roots. So 12 to 14 inches, as mentioned by Dave is sufficient for all practicall purposes.

About the stems being tal:, Don't worry. They will fall down and lay on the ground.
cyrus