How do your potatoes grow?

The potato seedlings that were planted at the beginning of April are pretty much done. The leaves are all brown and no potatoes developed at the roots.
I didn't try them during this month before.
Has anyone had success with potatoes at this time of year?

More New Potatoes- from Compost

It happened again this year. I don't know if I ever posted my potato story. Last year I found a nice looking plant in the beds where I bury the various table scraps. I left it going. A couple more popped up in other beds and I left them as well.
One day as I was burying more compost near by, I found what I thought to be a red rubber ball. It wasn't a ball, it was a new potato! I had no idea that new potatoes would grow in Miami. I assumed it was a northern thing and that was that.
I didn't mean to repeat it (or I would have 'planted' in a better spot) but it happened again. The problem this year is that I didn't leave it growing long enough. The cute little taters aren't even the width of a quarter. Now I'm going to try to do it on purpose. I've picked a spot and tomorrow I'll clear it of the various weeds.  I'll keep you posted.
Anyone else successful in growing potatoes down here? types? start times? suggestions?