long straggly potato plants

I have got some potato plants that I have grown in old hesian bags.  These are earlies and have grown to around 4 foot now but have never flowered.  The plants are now toppeling over and starting to die with the rain hitting them.  What am I best to do is it worth cutting all the folage off and harvest any potatoes (that's if any have actually grown) or just leave them intact and harvest them as I need them.

thanks

Some varieties just do not boast many a noticable flower. Or shade/too much feed/rich soil can result in excess foliage.

Definitely have a look, otherwise, you shall never know, what's in the sack.