One of my favorites: scabiosa, or pin cusionflower. I tried relentlessly to grow this in mucky thick soil I had in Wisconsin, with no luck- even after amending the darn soil. Here in our part of minnesota I find we have tons of sand in the soil, and the drainage is superior. These pin cusion flowers love it. I have 3 from last year about to start pumping out blooms, and I picked up this one earlier this season.