If you mean the one just behind the white one, it looks like sea thrift. Comes in various pink/purple shades, and white.
https://www.rhs.org.uk/plants/1597/Armeria-maritima/Details
There are two plants. The pink puffs are sea thrift, Armeria maritima. The ones behind it are Heuchera 'Purple Palace. Hope this helps.
Sue S
Lankford Associates Landscape Architects