• May 23, 2026 herrenhauser garten hannover arnhold kotyrba arch eserving its cultural heritage. Visiting Herrenhäuser Garten and the Arnhold Kotyrba Arch Best Times to Visit Spring and Summer: Peak blooming season, vibrant colors, and lively atmosphere. Autumn: Rich foliage and peaceful ambiance. Special Events: Garden festivals, historical reenactments, By Ettie Lakin PhD