I also have a couple that I consider to be in the negative category. That would be those that bloomed on a single rhizome, and have not increased. 'That's Hot' and 'Feudalism' fall into that category.
I should also point out that almost all of my rhizomes go into 1or 2 gallon containers when I receive them. I can monitor the water & fertilizer better when they're all hanging out together in the "nursery" (or punishment pile as Dave calls it- yes I have some plants that have been in containers for over 10 years..but not Iris!).. Most get planted in the ground in late summer/fall when the plants aren't expending so much energy, and can get by with a good single soaking before we get rain (she says hopefully).
Rob, I'm particularly interested in what has done well for you (since we're almost neighbors, afterall).
