I never planted this, but from photos of it, I'd say that it looks like Sea Holly and I have see it in lavender so maybe it is, because for some reason that name stays with you. I love all the shades of green in here.
You will be led to the knowledge of the internal things which are invisible to you, by the external things which you see before you. . . . Even so then, we can represent to ourselves in thought the Author of all that is, by contemplating and admiring the (visible) things which He has made, and ever brings into being.
- Hermes