Within the Cortusoides section of the genus Primula there are other species to collect along with the two mentioned above. P. polyneura is on my primula lust-list along with P. jesoana , P. geraniifolia and P. saxatilis . If you have success with a given species of primula, look it up in a good reference book to see which section it is placed within. There will usually be other species described that are closely related enough for you to enjoy with further success in your garden. Almost any native or non-native spring blooming woodland perennial goes well with primula.
Ferns always provide an excellent backdrop for showing off the foliage and flowers of primula.