Posted: 21/09/2016 at 17:59
There are hundreds of varieties! Bearded Iris are very different to the Dutch Irises though. They need plenty of sun and good gritty, free draining soil. You plant those with the rhizome just proud of the soil so that the sun can get to them after flowering.
If you're wanting to put them with the Polemonium, you'd be better with the Sibirica types as they like damp soil. They like a reasonable amount of light too.
I grow the Chrysographes Irises which are really dark purple with a little yellow flash, and they're shorter than the Bearded ones. Finer foliage than them too.They'd possibly work quite nicely with your Jacob's ladder. Mine ar enext to my little pond, east-ish facing