Do you know this plant?  It is Salad Burnet, Poterium sanguisorba.  It is a perennial and grows about 12" high, and as wide.  The leaves are used in salads and smell and taste like cucumbers.  

 

I planted some seeds years ago, and it just keeps coming back.  It doesn't always come back in the same spot like you would think of a perennial, but we still have Salad Burnet without replanting the seeds.  Sometimes it goes to seed, and then those little plants come up all over the place.  That's ok.  If they sprout in the hills they get to stay, but if they sprout in the walk paths they gotta go.  

 

You can even grow it in a pot;  that's how my sister in Yorktown does it.  We love Salad Burnet.

 

HAPPY GARDENING!!!