lauriemorningglory said:Before the Storm is a nice black. I've never let it grow in one place for many years before dividing, so I don't know if it would meet your requirement for not dying out in the center of the clump. Same with Dark Passion--a purplish black that looks black from a distance.
My least favourite iris is Kochii. I don't care for the form. It always looks messy and it is taking up valuable space.
Australis said:Crimson King (or whatever it is) grows well for me. It doesn't have great form, but is hardy and vigorous. Biggest downside for me is that the blooms tend to get wrecked easily by the wild winter and early spring weather.
Ian, it's also worth noting that Crimson King isn't as big as today's TBs. It's the size of an IB.
'Saffron Drift' is another that multiplies well for me and has good branching.
Totally_Amazing said:Neon Blue makes a beautiful clump for me every year. I don't know how it performs in your climate.