What is a forest an old growth forest? An old-growth redwood forest is a rare, ancient ecosystem dominated by coast redwood trees (Sequoia sempervirens) that have grown for hundreds to thousands of years with minimal industrial disturbance. These forests are defined not just by big trees, but by complex structure: massive trunks, layered canopies, standing dead trees (snags), fallen logs, rich soils, and cool, moist microclimates that support exceptional biodiversity. Old-growth redwoods store e