Mainau gardens Germany
Gardens of World. Mainau is a “flowering island” notable for its parks and gardens. Frederick I, Grand Duke of Baden, created the island’s arboretum, which now contains 500 species of deciduous and coniferous trees, many exotic and valuable. The island also contains about 200 rhododendron and azalea varieties. The island as a whole contains about 30,000 rose bushes representing 1,200 varieties, and about 20,000 dahlias of 250 varieties.