Dracocephalum ruyschiana (Isoampiaisyrtti)

I have bought this plant about 2010, but had forgotten its name. It took really long time to recognize it, because it has not been for sale after that at least in those garden shops I use to visit. It was really difficult to find in internet too. But the plans is hardy and easy to keep alive even growing in poor soil. It also makes seedlings easily and the color of the flowers is nice.