Western azaleas have a longer flowering period than local azaleas.
Tips
usage
洋 (foreign / Western) is a common prefix marking imported cultivars - compare 洋葱 (onion) vs 葱 (green onion), 洋白菜 (cabbage). 洋杜鹃 refers specifically to the showy hybrid pot azaleas developed in Belgium and sold as houseplants.
