The Eunice Fisher Hosta Garden features hostas hybridized by Wisconsin native, Eunice Fisher. Bolz Conservatory The Bolz Conservatory is a 10,000-square-foot greenhouse housing over 750 plants representing over 70 families and over 550 different species and cultivars. The plants are native to tropical and sub-tropical regions. The structure itself is a glass pyramid measuring 100 by 100 ft (30 by 30 m) and rising to 50 ft (12 m) at the apex. The temperature is maintained between 65 and 80 degrees fahrenheit (between 18 and 26 °C), although the sun may warm it to 100 °F (35 °C) in the summer. The relative humidity is maintained at 70% or above. In addition to the tropical plants, the conservatory is home to species of birds including canaries, waxbills, diamond doves, Gouldian finches and owl finches . There is also a koi pond, featuring koi and goldfish. Frogs, toads, and geckos are also present. While admission to Olbrich Botanical Gardens is free, a small fee is charged for entry into the conservatory. Daily hours are 10am-4pm. Gallery See also List of botanical gardens and arboretums in Wisconsin References External links Olbrich Botanical Gardens Website Portal Wisconsin Entry Botanical gardens in Wisconsin Geography of Madison, Wisconsin Protected areas of Dane County, Wisconsin Tourist attractions in Madison, Wisconsin Greenhouses in Wisconsin