Posted: 05/02/2014 at 17:42
I have planted many iris alongside the road in my garden in the Languedoc. So long as the rooted section is in the soil they seem to grow well, both in full sun and in shade. They don't need feeding but they do need the sun to bake the rhizomes in the summer. They grow like this in and around Monet's garden too, but they do need to be split, as you say, regularly to remove the older corky bits. They don't like being wet - the drier the better!
Good luck - the colour and honey scent are just wonderful.