Posted: 06/07/2014 at 21:08
If you cut the stems off because of blight, you can harvest immediately, you don't have to wait ten to fourteen days, or did I misunderstand what you meant? Usually if you cut off the stems/haulm/leaves you can leave the potatoes in the soil for a period until you want to dig them.
You will always get a range of sizes from large to tiny. Try and find every little one or they will grow next year.