Interesting. Looks so familiar but I can't think of a name. Can you show us Again when the buds open?

My thought exactly, but perhaps a Silene.

Good thinking. Maybe S. vulgaris?

Or maybe Linaria dalmatica?

I was thinking S. vulgaris floral but did not have time to explore other possibilities.

Not familiar with L. dalmatica but online pix show less completely opposite leaves, less clasping stems and more broadly oval leaves. Looks very Caryophyllaceae to me.

Thanks for inputs. Seems we'll just have to wait and see! How exciting. ;-)