Last year, just for fun, I planted a spud which was chitting in a big plastic pot full of home made compost. Fantastic success for a non gardener. 10lb from one little spud.

Thought i would have another go this year and in a couple of large pots, planted three chitting spuds. Earthed up to the top and now a forest of of very healthy green much to high to earth up any more, but I think it is high enough. ....... however. No flowers. Question from a non gardener. Do spud plants have to flower to show/produce the require crop of spuds?