Garden Society (Tradgardsforeningen). The Garden Association in Gothenburg stands out as one of the finest examples of 19th-century parks in Europe. In the summer months, the Rosarium bursts into life with thousands of vibrant and aromatic roses. Inside the Palmhuset, a stunning greenhouse dating back to 1878, you can explore a variety of palm trees and other exotic plants. The flowing shapes and lush plantings transport you back to the golden era of garden design.