Leaf Mulch is made up of natural leaf litter that has begun breaking down. It is great for native gardens that will add to existing leaf litter over time. Leaf Mulch is fast to break down providing quick access food without a pungent smell. We stock this as both “New” and “Old” Leaf Mulch depending on which you prefer. “New” Leaf Mulch is the newly delivered product that hasn’t really had a chance to break down where as “Old” Leaf Much has started to break down.