Buddleia colvellei, from the Himalayas is considered to be the beauty of the genus

This plant is in flower at the top of China Valley about 15' off the road at the north end of the top bed. Because it reputedly flowers on old growth and isn't really hardy here, this may be your last chance to see these flowers. These buds then would have formed last year and survived the winter because we kept it in a polyhouse that we don't quite allow to freeze, essentially giving it a Zone 8 winter.

I expect I'll cage it later this year with leaves and see if we can bring some woody growth through the winter. We do have our occasional Zone 8 winters so there's reason for hope.