I have all my losses on my list here. They are listed as Previous Daylilies. All the ex Daylilies are plants that didn't make it.

Here is the count on my ex plants

Evergreen-15 plants

Semi Evergreen-23 plants

Dormant- 26 plants

So, just to confirm that it's not always the foliage type that is more susceptible to dying off. However, I undoubtedly have more Dormants in my yard than other kinds, it's not statistically correct to claim that I have equal numbers of the three types of foliage.

I know for a fact that I have bought well over 1000 named daylilies, with roughly 20 to 30% of them being fully evergreen. I have only ever lost 2 plants! I will eagerly admit that I have had a bunch that more or less just sat there year after year, but they didn't die! I can think of three more that were virtually on the brink when I took them out. Actually, one of those is now potted and doing really well... and it is supposed to be dormant- although it isn't. I did get one from a grower two years ago that was a very small pencil sized single fan. I potted it and kept it in the greenhouse. The more I watered it the more it died, so I am assuming it had been hit with Round-up before I got it, and I don't count that one.... Wilma R. Penland is another one that just kept lingering until I had my fill of it, but it didn't die. My Chihuahua Bites is another, but it was a bonus plant that I didn't order anyhow. Dreamliner was hardy enough, but it just didn't do well here and I took it out.... That was a $250 mistake!

I do know that in southern growing areas, they have crown rot, where we normally don't have that here, so I suppose I can understand a few more lost plants in those places, but 64? WOW! Trying to be polite, but I really have no response to that. Double wow!

Yeah, I'm approaching 1,00 plants myself. But I also think we probably have more freeze/thaw here than you do, which is the worst case scenario. Plants get heaved out by frost. Sometimes it gets so warm they think it's Spring, then they get slammed again. It's very inconsistent and goes on that way from November- April. I try to protect them with mulch and leaves but that's what happens.

Plants get heaved out by frost?? Do you use a lot of composted material? The reason I ask is because I have done that, and compost breaks down very quickly, which gives the appearance that the plants are heaving.... In regular soil, they should never move up, even after several years. Or, at least mine never have. With compost, they need to be topped off annually, and compost is airy, which allows roots to both freeze and dry out much easier. I also seriously doubt that you have more freeze thaw incidents than we have here. It can be brutal here.

At the moment, I have fewer than 200 named plants, and would like to get rid of all of them eventually.... except that I keep ordering more every year! I do have a few thousand seedlings though and have another batch of seeds stratifying now. My seeds are measured in "pounds".

New plants do. If they haven't effectively set roots yet then they can get heaved. It's happened to some of them. But most of them just melt away, sometimes over the course of two or three years.

Here's a Z:4 plant nursery in MN. I was checking out their inventory. They seem to sell mostly their own introductions. I haven't bought anything from them yet but I am eyeing at least one daylily.
https://www.hostalink.com/info...

There are probably several nurseries on the Canadian prairies that sell daylilies. Although they may not ship to the U. S. their cultivar listings should provide the names of daylilies hardy to zone 4 or below. There may also be daylilies sold in locations in Alaska that are zone 4 or below.

I ordered some plants from that nursery last year. Some of them even flowered last summer. I'm expecting they will have no trouble surviving a zone 6 winter.