I mix my colors. There are browns that look great with light yellows and pinks or oranges. Dark Purples and bright yellows in a mix of pastels can make the mix pop. Reds mix with so many colors as there are lots of shades of red. And pale blues, whites and light pinks can work as great color breaks between a mix of bitones and multicolored iris.
Do not trust the bloom times to be exactly true in all cases. The climate can change bloom time. Some of my dwarfs bloom after some TB's, My other medians bloom along with the TB's for the most part. Having a mix of bloom times in the same part of a bed gives you continuous color coverage. Otherwise you will have patches with no blooms.
Write a log of when each one blooms for you this spring. You can then use the log for future garden layouts. (You know you will move some around!)
