The International Rose Test Garden (the International Test Rose Garden) is a rose garden in Washington Park in Portland Oregon (USA). It brings together more than 7,000 roses of 550 varieties from around the world. The roses bloom from April to October with a peak in June, depending on weather conditions. New cultivars of roses from many parts of the world are continuously received by the garden and are tested for their color, fragrance, disease resistance and other characters. It is the oldest …