Anybody who's grown, deliberately or not, the original, non-hybrid daylilies, knows how hardy and invasive they can be. Depending on your preferences, that's either a curse or a bonus. It holds true also with the semi-wild variant that has double flower petals. Same orange, same height, same habits, just prettier. At least to me, anyway. That holds double for the patch in the Minnesota house's yard. The originals came out of the backyard border from my folks last house, before they cashed in and switched to senior rental living.
These started as clumps carried home in a box the summer I had the house built, 1991. Since I wanted them in front by the driveway and the house wasn't finished until late July, they got dug in way back in a corner of the yard, out of the way of all the contractors. In fact, a lot of transplants from garden catalogues, friends, and my previous yard got moved that way before getting their final locations. The contractors took an extra month, so I had a lot of plants needing to be heeled in.
The first few years there were a lot of weeds in the daylily patch. But true to form, they spread into each other tightly enough that there was no longer a place for any weeds to grow after just a few years. They were kept in check by the asphalt of the driveway, the mown grass toward the street side and deep tree shade on the back and sides.
As an aside, when the latest neighbors had moved in, we had a discussion with them because the patch was reaching the edge of our yard and about to creep into theirs, and I assured them whether they mowed them or kept them, hey! It was their yard. I tend to have the same discussion with all my neighbors about other vegetation crossing the property line. Tree branches in their way? Apples or hazelnuts hanging over their side of the fence? Lilacs moving over full of blooms that beg for cutting for a vase? All yours.
Just don't mess with my side of the property line!
That spot in the back yard where the originals had been parked still had bits of rhizome left underground here and there, and it took several years of mowing the spot to finally discourage them. They are damn hard to kill! (The original raspberry site was the same way.)
That's why yesterday afternoon was such a shock. Paul and I were swapping cars in the driveway so first one out in the morning was closest to the street. Walking back to the house, I noticed something very peculiar. It hadn't been there the day before, which I know because I was admiring them while I was backing my car out to go visit family. Now, with only a couple of exceptions, the entire patch was laying flat, every bit of vegetation dead. Completely brown and dried!
You can't kill daylilies. You just can't. But... somebody had. We don't know who, nor with what, nor why. I even spent time online trying to find out what's out there these days that might have done the job. There was no information beyond complaints that they weren't killable without working at the job for years.
I went next door and had a friendly chat with the neighbor. It wasn't initially intended to be, since I figured he must have sprayed them with something, deliberately, or as a victim of drift. However, the first time I went over, the neighbors were gone. It gave me time to cool off. So later I approached the issue more with a "Did you notice...?" attitude than a "How the hell dare you...?" one.
By the end of our chat I left willing to believe he had nothing to do with it, hadn't noticed anyone else messing around, and had actually liked watching them bloom every summer. Neither of us knows what could have done the job so quickly, no yellowing or wilting first, just sudden death. The only thing I am aware of that could so thoroughly poison a patch of ground is arsenic, but that's so indiscriminate, and moves through the ground affecting everything for years, that only a fool or someone overflowing with deep malice would use it, and I still don't know if it would work so fast. I've never been that particular kind of malicious fool. If indeed the ground has been poisoned, we both will be watching our trees and shrubs along the property line, as the patch slopes downward towards it, and everything's roots go under it.
Meanwhile, we're hoping. Hoping that whatever was used was just something to kill back the foliage. Hoping that even if it were a root killer, there will be some rhizomes not affected and the patch will grow back. Paul might be able to tell before the ground freezes, but if not, for sure next spring.
But barring a confession, the sudden die-off will remain a mystery.