Totally_Amazing - thank you for your welcome too!
Ok I did all the calculations precisely and I can adjust the spacing to 18 inches if you all think it's to thight
The highest I could go is maximal 20 inches apart or removing one or two of the planned cultivars.
I would love that the three rhizomes of one cultivar grow together when they mature. Can I leave (or even shrink?) the spacing between them to get a nice group of one cultivar and at the same time increase the spacing between different culfivars to 18 - 20 inches for example? Edit:
http://www.irises.org/About_Ir..., here it says that rhizomes of the same cultivar can have a spacing of 8 inches between them. Is that correct?
The idea about adding small non-spreading plants between them sounds good. What about some bulbs?
Thanks for the photo too! It's surely helpful to see some examples.
