DUH! I just figured it out.

I've had years when I lost a lot of irises as a result of extended periods of winter deep-freeze with no protective snow cover. Even in those years, though, there were specific cultivars that I KNEW were tough enough to take it, and they never let me down ... until this year.

That's what's been mystifying me about this year. Among the current losses are quite a few cultivars that have always been on my "indestructible" list - irises that have survived winters when virtually all of the other irises around them died. So why did they give up this year? What's different now?

I just figured it out. I've had all the puzzle pieces for weeks, but I just now put them together into a comprehensible and sensible picture. The difference this year is that the weather pattern has still not stabilized into anything recognizable as spring! We keep getting a couple of days of warmth that stimulates growth followed by a bunch of days of cool that puts an unceremonious halt to any growth. Start-stop-start-stop-start-stop-start-stop-start-stop ...

In the past when rot has overwhelmed my early spring garden after a particularly difficult winter, the "indestructible" irises have always managed to outgrow the rot as soon as warmth returns to the Northland. Not so this year. They simply aren't getting the warmth they need to grow. Each time I inspect the rows, I find clumps that appeared to be starting to recover a week ago which are now rotting and dying (or dead) again. Any potential recovery gets stalled each time another cool front sweeps in. The irises simply aren't able to outgrow the rot this year, and every week more of them are losing the battle entirely.

Sad, yes, but also enlightening. I really thought I had the toughest of the tough growing in my iris beds now, but this new challenge is telling a different story. My "indestructible" list will be both shorter and more meaningful by the time this season is finished. "Tough" has taken on a whole new definition at The Irises of Shadowood.

Laurie

Maybe it means you'll have a late spring this year..... *rolls eyes, ok it's wishful thinking* ....when the weather stabilizes.

Have you considered some floating row cover (reemay, perhaps)?

No, I won't cover or winter-mulch my irises because I have absolutely NO desire to grow any plant that needs to be coddled in my climate. If they can't hack it here without "clothing", they're welcome to die.

I think this theory may be applicable to the sibs also, Laurie. I have three Plum Frolics, that have been up three times, dying back twice, this spring. Now we're going into colder weather again for about two weeks. Let's see if they die back again. They are only up about an inch, where most of my sibs are up about 6-7 inches.

Makes sense to me, Polly. I fear, though, that a number of my Sibs have had too many false starts this spring and have now died. Time will tell. There's only just so much stress any plant can take.

I have never had this happen before, in 14 years of sibs.

Maybe we need to get it that our world weather is changing, and what was fine before may never be fine again.

Tune into our new Sustainability Forum... some great thoughts and ideas there.

I think our up and down weather has really done a job on my Iris too. first a few days in the 90's, then a week of way below zero, then summer like weather again, them pouring rains, now rather cool Poor Iris don't know what to think and neither do I.

Susan