This will probably sound crazy, but, next time you divide it.....fertilize the **** out of at least one piece. Try a handful of alfalfa pellets in the "planting hole", water it in with the "regular" Miracle Grow" (not the 'bloom buster'), and give it a dose of 10-10-10 the following spring . If you have any shredded wood mulch, use it...don't cover the rhizome, but do a 2' area all around the rhizome.
I have Clarence in two locations....in the "rebloomer bed", it's grown "by the book"....no excess nitrogen, no mulch...it gets a "high P" fertilizer, and blooms like crazy in the spring ! BUT, it never offers a rebloom. The other plant is in a mixed perennial bed, mulched with shredded wood, gets 10-10-10 twice a season, and gets sprayed with 'regular Miracle grow 3 times a season....it blooms "normally" in the spring.....2, or maybe 3 stalks. In the fall, it really goes to town, though...that 'clump' is about 18" in diameter, now, and was 3 rhizomes, planted (divided the plant)in mid-June. It's blooming later than normal, but it has 5 stalks . I'm thinking.....extra fertilizer at planting time means a larger root system, and larger spring rhizomes.....higher nitrogen means more increases and faster growth.....mulch means constant moisture........ !
rebloom size rhizomes need to grow fast...and "un-interupted", to be blooming size by early fall. I'm thinking you'll see some Re !
Name: Bonnie Sojourner Harris Brake, Arkansas, zone 7 The Magnolia Zone
Investing that much time and care in one iris is why I moved a lot of my rebloomers to the same area. Unfortunately, I was quarantined from the garden until after the first killing frost so nothing was cared for this summer. I just hope now I get spring bloom. Daughter Of Stars is blooming away so I will always think of that one fondly. I have a couple of medians that are blooming as well. Clarence did not re and another that I grow and has had re every year except for this year is Barn Dance. It is just too dry here and without water it will wait, I am sure, for a better year to re. I have lost a lot of other plants this year and some young trees due to drought and neglect. The irises may look bad but they will live.
Segregating the rebloomers to a bed "by themselves" DOES make their care easier, Bonnie.....that's for sure! This year, I've had a few rebloom, that *really* aren't supposed to Re in colder zones...if at all.....and I'm thinking it was the unusually wet August we had (we got OUR rain, and YOUR rain, too, I guess ). Clarence, though....and also Total Recall....always seem to have "minds of their own" when it comes to rebloom, and seem to want even MORE fertilizer to Re well.That said, I've never had any rot.....fungal OR bacterial....with either one of them, no matter which area they are planted in , so I guess they are extra *resistant*.
here's what's open, now:
Double Your Fun
Earl Of Essex
Lady Essex and Autumn Tryst
Low Ho Silver
My Friend Jonathan
and I didn't get pictures of Eleanor Roosevelt, or White Autumn King
The freezing temps (25 degrees) on the night of the 11th, and 26 degrees on the following night, pretty well stopped everything. There are a *few* buds that may still be viable, so I'm holding off cutting those back....just in case ...but, it's probably a "forlorn hope"
I just "crunched the numbers', and counting the "bulb" iris, bearded, beardless, and rebloom....152 days of continuous bloom The bearded gave me 53 days of spring bloom, and 52 days of rebloom, so, even with the disease problems I had at the beginning of the season........not too bad