Primarily native Houston hardwood species. Includes all parts of the tree - branches, twigs, cambium layer and leaves. A full nutrient profile to feed your soil microbes. The beneficial soil fungi treat this as as a royal buffet. They break down the wood, extract the nutrients, and feed them to your plant roots, which are conveniently located in the fungal "wood wide web" under your feet. There are a variety of particle sizes all mixed together, from shredded leaves up to wood chips that could be 4-6 inches long.