Hi There
I had to convert back to imperial! I planted spuds in raised beds in my first year and did find that ran out of soil to earth up but I still had a good crop during the drought year.
I now use a larger area on the plot and plant the spuds in a more conventional way, just because I find them easier to earth up and harvest that way.
I am trying one early spud to a bottomless black pot (morrison specials) this year, I have ten in a row and I have vision of pulling off the pot at harvest time to reveal just enough perfectly formed new potatoes for the four of us ;D