Rose Test Garden

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The Potland Rose Test Garden is the oldest continuously operating public rose test garden in the United States and exemplifies Portland's nickname of the City of Roses.

As of this writing, there are over 7,000 rose plants of approximately 550 varieties. The roses bloom from April through October with the peak coming in June, depending on the weather.

New rose cultivars are continually sent to the garden from many parts of the world and are tested for color, fragrance, disease resistance and other attributes... (excerpts from relevant Wikipedia article)