Red yucca has been on my wish list for a long time; the only source I've found for them is High Country Gardens and I'd been hesitant to order from them after they changed ownership. The reviews have been pretty good since they changed hands so I'll probably order from them this spring.
I love primroses and for some reason have never acquired the common yellow cowslip. I'd like some other primula too, especially some hardy blue varieties.
Helianthemum have been catching my eye for years, but having never seen them grown here I was reluctant. I picked up a gallon pot of a bright orange variety last spring and it has grown beautifully. The grayish foliage is attractive and appears to be evergreen- it still looks great. I'd like to try lots of these!