Help to identify

Hello, Could someone please identify this lovely little plant ? It is about a foot tall, with bell shaped flowers. thank you nancee.

 

Probably obedient plant, Physostegia virginiana.
(Failing that, perhaps a dracocephalum.)

 

Yes, looks like physostigia.

 

Thank you very much, i looked up the name and that is exactly what it is. This plant is only 2 years old and hasn't really spread at all.Some websites say that it is invasive, I didn't plant this but the spot where it is could use a little help. So I would be happy to see a little invasion. thanks again nancee