(AP) — Good ideas die hard. Steele Burden, whose family gave more than 400 acres of land on either side of I-10 near Essen Lane to LSU, laid out a tree and shrub identification trail behind what is now the Burden Conference Center.Over time, the plant identification markers got broken, stepped on, rotted.When Pat Hegwood became director at Burden in 2000, the trails had fallen into disuse and were being reclaimed by the woods.He turned to Baton Rouge Green “because they’re all about trees,” said Hegwood, reached at a conference by telephone. “I started working with Sue Heflin and Peggy Davis. They wrote grants, and Peggy organized volunteers. They spent thousands of hours working out there.”