I have an area with deciduous trees that receives a fair amount of sun in spring, but only a couple of hours at an angle like Mary Ann described during summer. I've had some old noids there for years that bloom well, which is why I've left them there. Now that I'm needing iris space I'm trying various others there. Dwarf varieties are responding very well and most of the TBs are blooming well. I planted several I had divided in that area a couple of years ago and this spring had great bloom from them.
I'd like to see breeding efforts toward shade tolerant varieties. ....which is good incentive to try my hand at some crosses...hmmmm...
