Three feet of hilling is rather more than needed, I think. Generally, allowing potatoes to flower and set seed-fruit doesn't affect production much if at all. Sounds like possibly too much nitrogen.

What pnbrown says is correct.

Also, you may not have dug deeply enough to find the potatoes. Dig down to the level at which your seed pieces were planted. Many are apt to be at that level. None will be deeper.

Jim

Too much nitrogen? That's strange since I used potato fertilizer. I would think that the people who make it would know the proper ratio.
By the way, does the fact that there's not a lot of flowers affect potato production?

Already there may be more nitrogen in the ammended soil at the time you planted the potatoes.Not having lots of flowers does not affect production.Are the berry type pods green in color? If so then remove them.They contain Solanin which is not good for consumption.Remove green potatoes also.
How do you know that they are seed pods?

Hi Chaman - I don't know if they are seed pods. I'm assuming they are. They are round and green. I'm also assuming that I should treat them like I treat bulbs. In other words I wouldn't let the flowers of tulips go to seed because I want to keep the bulb producing. Is it correct to do the same with potatoes or does it even matter?

The thread linked below has an excellent picture of potato seed pods. Just scroll down to the pic. ;)

Unless you want to save the seeds for some reason (some do), remove them just as you suggested one does with bulbs. The energy going to them isn't needed and they ARE poisonous.

Dave

Here is a link that might be useful: Potatoes

Hi lovetogarden: Yes they are seed potatoes.
Thanks Dave for Potatoes link
I Googled for more information where I found an article about potatoes on Wikipedia.org confirming the same thing.

they are seed potatoes...

Then perhaps I misunderstood you original post? Are the green pods growing in the picture I linked above what you have?

The green pods growing where there were some blooms are seed pods full of potato seeds. That isn't the same thing as seed potatoes. ;) Big difference.

In the pods, if you leave them to dry, will be lots of little seeds that can be planted to grow plants that will eventually develop small "seed potatoes".

Seed potatoes are bought at the farm center/store or ordered from seed catalogs and look like small potatoes with tiny sprouts on them. They get planted in the ground to grow potatoes.

Make sense or only add to the confusion?

Dave

It should read they are "potatoe seed pods" instead of they are "seeds potatoes".
Thanks Dave for pointing at the mistake.