The house, designed by Baltimore City Hall architect George Aloysius Frederick, was eventually completed in 1888 and remains intact, a stone structure built of gneiss from Tyson's quarries at Bare Hills, with mansard roof, tower, and an Italianate cupola. It became the Cylburn Wildflower Preserve and Garden Center in 1954 and, in 1982, was renamed the Cylburn Arboretum Association.The Cylburn Mansion houses a display of watercolor paintings of Maryland wildflowers that is open to the public.Today the arboretum contains an extensive collection of trees and woody shrubs based loosely on the Tysons' original plantings. Collections include azaleas, bamboo, beeches, boxwoods, chestnuts, conifers, hollies, Japanese maples, magnolias, maples, Maryland oaks, and viburnum.
