Sweet potatoes that aren't - plus a list of sweet potato slip vendors

I'm looking for the least sweet sweet potato.  Or the most savory sweet potato.  However you want to put it.  But most sweet potato growers focus on the sweetest, it seems.  Sweetness seems to appeal to more people.  Can you help me find the least sweet one?

I'm also making a list of sweet potato slip sellers.  Say that 5 times fast.  Please add any you know of below and I'll add them to this list!

Sandhill Preservation Center sweet potato varieties  Sandhill has the largest selection I've found thus far...

Southern Exposure Seed Exchange sweet potato varieties for sale  Large variety.

Fedco Seeds - sweet potato slips  They only sell a few types.  All quite sweet it sounds like.

Duck Creek Farms sweet potatoes   I've never heard of these guys before, but found them online.

Additions from below:

George's Plant Farm sweet potatoes  A lot of varieties, plus photos.


Even though I'm looking for sweet potatoes that aren't [sweet], feel free to list your favorite sweet potato and why.  Just let me know if it's sweet so I don't order it.  
So what are people's experiences with sweet potato varieties and sugar levels?  Thanks!

Edit: Least sweet list thus far, based on comments below

White Hayman
Purple Passion


Thanks for this everyone!

sweet potatoes

I bought several varieties from this place. All grew & taste great. The White Hayman seems the least sweet.

Mike Barkley wrote: I bought several varieties from this place. All grew & taste great. The White Hayman seems the least sweet.

Thank you!  So I looked up the White Hayman above. It has a characteristic I am not familiar with but that seems key to my search.  It says it takes a month to sweeten in storage.  Ah hah!  That's good to know...that some sweet potatoes come out of the ground starchier, and the starches convert with time, presumably.   That's very interesting.

Mike, did you try the Purple Passion or the Kotobuki?  The Japanese varieties?

That is very interesting. So far we've been eating them at about the same rate as they are harvested. Will save a few for a month or two & try to observe the change. I've noticed the texture is slightly different than the orange ones. A little crunchier is maybe the best description.

I did not try either of those 2 varieties. Good chance they will be on next year's agenda. Sweet potatoes do very good here so I'm increasing the diversity each year.

Thanks!  I've been trying to find a white heirloom variety for years, with no luck.  The elderly farmer who grew it seems to have passed away and no one else in the area grew it.  It was barely sweet at all, and so good, just simply roasted, with butter, salt and garlic!  There are so many white varieties (it was really more tan), its is hard to know where to start.

Kim Goodwin wrote:

Mike, did you try the Purple Passion or the Kotobuki?  The Japanese varieties?

I have tried the Purple Passion from George's. It's excellent, I got fairly long thin ones, but I was growing in NM heat. I think they are less sweet than most, which works for me, as I prefer non-sweet also.  I'm watching to see what varieties you come up with here! I want them. I had one type, years ago, that was, to me, inedible due to sweetness, unless cut with white potatoes.

:D

I grew sweet potatoes for the first time this year.  They were awesome.  We just had a small garden to work with, so I decided to use an organic sweet potato from the store for starts. It grew way more than enough.  It was probably a Georgia jet type - orange in and out?  I looked up how to harvest and store them, and watched this little video from Shannie McCabe at Baker Creek Heirloom seeds:



When she explained that you need to cure them for ultimate sweetness and longevity, we realized a quick solution to our not liking sweet potatoes very sweet.  We ate them right away!  They were so good.  They were more starchy and they both oil and dry fried (I mean baked) really well.  I still want to try Hayman and the Purple Passion, but it was nice that we could just try growing them form a supermarket first.

I think I may have overwatered them, actually.  About 1/3 were big tubers that had rotted.  So I'm learning.  This is a very novel crop for me!