1,700 trees were planted in a stream that leads to the Potomac River's largest tributary. Image: Cheryl Costello

VIDEO: CBF Holds Largest-Ever Tree Planting In Potomac Watershed

The Chesapeake Bay Foundation has done a lot of cleanups and tree plantings in its 50 years. But this Earth Day, on a small tributary of the Monocacy River, the organization hosted the largest tree planting in its history. Cheryl Costello joined spirited volunteers outside Frederick, Maryland who hailed from western Maryland and Baltimore alike. Watch below: