I planted a lot of spuds end of March and only this week have I seen the tops! I can't get the hang of that "Hilling" business so once they are a bit taller I will put straw around them.
I think that potatoes are pretty hardy and don't need much water. My very early planting (yes, a bit foolhardy) got a bit frost bitten by a couple of days of very chilly temperatures: on a friend's advice, I hoed off the dead bits of growth, gave them a little bit of water and in fact they have sprung up again. They are a good plant for the newbies like us ( that probably scare the heck out of our plants, wondering what we are going to do next to try and kill them off ;D ) and there is something magical too about harvesting spuds - by then the top bit is dead, you root around under the plant and lo and behold - a spud! no, 2...no wait, 5, 6... beautifully firm and earthy smelling. A proud moment *little tear in the eye*