Caryopteris incana-yellow foliaged varieties

Caryopteris incana ‘Sunshine Blue’ is probably the best yet of the yellow foliaged varieties. It is a deeper yellow than ‘Worcester Gold’, the flowers are bright blue rather than pale blue because it is a C. incana (rather than C. x clandonensis) and for the same reason it should be hardier, although neither should suffer in well-drained soil – but they don’t thrive on our heavy clay. The other new golden Caryopteris (C. ‘Hint of Gold’) seems to be less golden than ‘Sunshine Blue’. Both are subject to PVR. I am going to do a Caryopteris cribsheet before next spring.