In Oregon, an estimated 25% of historic oak habitat has survived and only 1% of native prairies due to clearing for commercial tree plantations, pasture or development.

“Old Glory,” a roughly 400-year-old Valley Oak tree in Stevenson Ranch, became a Los Angeles County Historic Landmark this week. But it wasn’t always a walk in the park to protect the ...

“Old Glory,” a roughly 400-year-old Valley Oak tree in Stevenson Ranch, became a Los Angeles County Historic Landmark this week. Why it matters: But it wasn’t always a walk in the park to ...