Texas Gardening: Is This Phlox?, 1 by DanceyTx

DanceyTx wrote:
None of my flower beds have been cleaned out yet. I have some flowers that I planted last spring that I thought were Bouncing Bet or Soapwort. Now they are in bloom for the first time and I'm not sure what they are. They look a little like tall phlox.

What is this flower? Whatever it is had grown years ago in my children's great grandmother's yard. Since my dd and family live in there now she gave me some of these plants.