Wow thank you so much for such a big response
I'm extremely happy that I got so much info.
From all your suggestions about how to plant (especially Totally_Amazing and cbunny41) I think it's the best that I get only a single rhizome of a cultivar. I adjusted all my measurements and looked at my place again and to avoid the shade, etc.. the shape of the triangle forms a little different - it's a right triangle. Silly me didn't realize this before
. To get to the point - I can easily plant them 20 inches apart if I get only one rhizome. I also really like the suggestion of DaveinPA and Crowrita that I could interplant with lilies or gladiolus to fill in the blank spaces. This would look wonderful until the irises spread a little bit. When the spacing is thight I can easily give up the other plants - irises must be the queen in this bed!
Also thank you so much for the link of cbunny4, this is a great solution!
About the choice where to get the rhizomes - Cayeux is interesting (thanks cbunny4) but somehow Mid America Garden looks the most promising to me
the thing is I contacted them and there's a really fair option. They ship all the irises together that were bought by them from EU customers to Netherland. So the phytosanitary costs are not about 100$, but only 5$ on a customer and you pay 1,25$ more for each iris for the shipping. This way the additional costs and packaging for me are about 25$ which is pretty much similar to getting plants from Cayeux, Bourdillion or Iris4u.de. The thing is, this way I get the cultivars I want. I know... I'm really picky :D
I must also thank janwax and Henhouse for the kind words about the color combination choice and Henhouse for the link - the combinations that susan makes are perfect
. I'm really glad that someone like my choices too! I loove mauve, violet and brown tones. Also I'm really happy to see that some of you have a combo of irises and roses at home. I talked with my partner and his father and they were both somehow skeptical if the irises are a good choice for planting them in the garden
I think they are both more a rose loving person
- I personally love both, roses and irises <3 (lilies too)