+22 International Rose Test Garden March 2023. Washington park brings in 3.5 million visitors annually. Unofficially known as the portland rose garden, the space features more than 10,000 roses.
Roses that look a bit heat stressed after summer, will respond to the milder weather developing this month, with a period of rapid new growth, leading to a spectacular autumn flowering in april and may. Web washington park is the crown jewel of portland. Web more than 10,000 individual rose bushes bloom in the international rose test garden (irtg) from late may through october, representing over 610 different rose varieties.
