Thanks for the photobucket tips, Jon. I will do that once I get home (photo sites are banned at work.) Your potatoes look lovely. I noticed ours aren't flowering yet, but we did just do the last 'hill' two weeks ago, so it might come (if whatever is killing them doesn't beat us!). Keep your fingers crossed we will get to harvest our 9 remaining plants. :)

Only reason I can think of is that pumpkins are huge plants that would completely over run potatoes both Irish and sweet. Irish potatoes and pumpkins don't share the same growing season here.

Is the potting mix wet/soggy or dry? If wet, needs to dry out. If dry, it needs water. Does the pot have a drain hole? If not, shift it to one that does. Is that bulb putting out heat? If so, turn it off. Good luck.

njitgrad: Never had a problem with wilting before in 4 years so I doubt the containers are too hot for the roots. Just because things were fine before doesn't mean they're going to be fine now. Conditions differ every year. If you make your 5-1-1 fresh every year, there could be a difference in the particle size/absorbency of the materials you use, etc. I always water them heavily with each watering. When I say heavily I mean until water seeps out of all sides of the containers including the bottom. Probably about 2 gallons of water per plant. It depends on the rate of watering. If you dump a lot of water quickly, much of it may run off without hydrating the mix properly. Also, if the mix is getting too dry in between waterings, it doesn't matter how much you water when you do water. 5-1-1 is a well-draining mix, so it won't hold onto a lot of water. It's not like growing in-ground. So excess water does nothing, just drains away. The key is enough water at the optimum frequency. A ton of water but not often enough will still lead to drought stress if you're growing in containers with a well-draining mix. I understand that it's frustrating that what you did before is not having the same good results today, but it doesn't really help your plants to reject advice because what you were doing before worked before. It's obviously not working now for some of your plants.