Hearts Content National Scenic Area is a tract of old-growth forest in Warren County, northwestern Pennsylvania.

[4] In 1934, the Chief of the Forest Service recognized the old-growth stand and 102 acres (0.41 km2) of surrounding land as a National Scenic Area.

Lutz's 1930 study of Hearts Content was one of the earliest quantitative analyses of plant communities in an old-growth forest,[2] and it remains influential in the field of ecology.

[6] Lutz concluded that the even-aged white pine stand established following a major disturbance in the 17th century, such as a fire (possibly set by Native Americans during the Beaver Wars); since then, the species has not reproduced under the closed canopy.

By relocating and resampling Lutz's original plots, Whitney documented 50 years of changes in the structure and composition of the stand.