If I am the Doctor, Charlotte potatoes are my Daleks

Years ago I tried growing some Charlotte salad spuds in roll-up plastic sacks.  It's one of those space-saver permaculture crops-in-your-yard things.  They grew, but then died off: eaten by slugs who lived along the sack insides.

The next spring, I emptied out the sacks and lo!  There were some potatoes after all - sprouting ones.  I planted them up.  The same thing happened again.

Last year, I emptied out the sacks and lo!  Once more with the potatoes.  They come back every series.  I duly planted the happy-looking ones out in my new raised bed, and they went great guns... until I went on holiday as it rained and they got blight and died. 

Today, I was clearing the raised bed for a second round of square-foot growing (lessons learned: one plant per square foot except silly things like radishes; everything gets freaking huge; also put the sprawling plants on the far edge where they can just scare the schoolkids).  What were those weird weeds?  Lo, verily and behold: they're sprouting potatoes.  The bastards just won't die.  So once again they have pride of place, and once again I vow to look after them right up until I forget and they die. 

With luck, they'll die a glorious death on my plate this time around.