 Of the 127 stakes winners bred by Colonel Edward Riley Bradley at his Idle Hour Stock Farm in Lexington, Kentucky – which includes Bimelech out of La Troienne – Blue Larkspur was considered the Colonel's finest horse.Blue Larkspur was sired by Black Servant, who was second in the 1921 Kentucky Derby, just behind his Idle Hour stablemate Behave Yourself.Black Servant was a son of Black Toney, who also sired Kentucky Derby winner Black Gold).