Sitting in an old-growth spruce fir forest, Doug Smith says he can see first-hand the impact of reintroducing wolves on the larger ecosystem of Yellowstone National Park. Long before Yellowstone ...

Backyard Farmer Backyard Farmer: Tree Planting and Diseases Special | 56m 58s | How to plant a tree with Jeff Culbertson and Loren Giesler talks about what to do with cankers on trees.