4 Best Sights in Washington Cascade Mountains and Valleys, Washington

The Roozen family and Washington Bulb Company established this 1,200-acre estate in Mount Vernon in 1985—it's the world's largest family-owned tulip-, daffodil-, and iris-growing business. Sixteen acres of greenhouses are filled with multicolored blossoms, and more than 200,000 bulbs are planted in the show gardens each fall. The Skagit Valley Tulip Festival, held in April, is the main event, when the flowers pop up in neat, brilliant rows across the flat land, attracting thousands of sightseers. The garden and store are open year-round, and the staff is full of helpful advice for both novice and experienced gardeners. RoozenGarde is 6 miles east of La Conner. 

On Point Defiance Park's Five Mile Drive, the garden is a 22-acre expanse of more than 10,000 plants—some 700 species, including azaleas, blue poppies, and magnolias—that bloom in succession. It's one of the finest rhododendron collections in the world.

Situated above the campus of Western Washington University, 175-acre Sehome Hill Arboretum, with its native trees, shrubs, and other plants, has good views of Bellingham Bay and Lummi Island, especially from the facility's observation tower. More than 6 miles of trails encircle the beautifully landscaped grounds.

The chief attraction in historic, 28-acre Wright Park is the 1908 glass-dome W.W. Seymour Botanical Conservatory, a Victorian-style greenhouse (one of only three such structures on the West Coast) filled with exotic flora.