Hana no Chikyūkan (花の地球館), great greenhouse of the Gifu World Rose Garden (ぎふワールド・ローズガーデン)

The park at Kani began as a prefectural park project launched in 1984; the prefecture dates its opening to 29 April 1989, and the horticultural centre Hanatopia (花トピア) opened there in April 1989. Next came the exposition: from 26 April to 4 June 1995 the park hosted the Flower Festa 95 Gifu exposition, under the theme "Toward the future: flowers, dreams, people", which drew 1,915,657 visitors against 500,000 expected, according to Wikipedia's page on the exposition.

The exposition's "dream zone" included the 45 m Flower Tower and the Hana no Chikyūkan, a theme pavilion where exhibitions on various subjects proposed a lifestyle for the twenty-first century. The same page credits the design of both buildings to the architect Hidetoshi Ōno; no other confirmation was found. Today's great greenhouse bears the same name as that pavilion; the name, the exhibition function and the neighbouring tower all agree. The facilities were meant to last from the start, and several outlived the exposition.

The park reopened on 26 April 1996 as the Hana Festa Kinen Kōen (Flower Festival Commemorative Park); in March 2004, according to the prefecture, it became one of the largest rose gardens in the world. It took its present name, Gifu World Rose Garden, on 9 October 2021. On 17 June 2026 a notice from the operator barred access to the great greenhouse, citing its age and safety; the ban was still on the home page on 3 October 2026.

On the aerial photograph of Japan's Geospatial Information Authority, the great greenhouse takes the shape of a circular sector with a glazed roof, backed against the Flower Tower. The OpenStreetMap outline gives a footprint of about 1,900 m², whereas the prefecture states 2,669 m².

Photographs taken in February 2019 and published on Wikimedia Commons show a large hall under a glass roof carried by a lattice steel frame, with tall glazed walls. Taken from a gallery above, one of them looks down into an interior garden: a paved path, beds edged in timber, boulders, conifers and shrubs. At the entrance, an arched glazed canopy leads to a glass facade whose gable bears a large rose motif, a nod to the park's theme. The park plan presents it as a large flower-and-greenery greenhouse described as "seasonal" (季節限定).

The prefecture announces about 1,000 plant species, displayed to propose a way of living with flowers and greenery, and several flower shows a year. The park plan presents it as a "seasonal" (季節限定) great greenhouse. Photographs from February 2019 give an idea of what could be seen there in winter: pink tulips in bloom, planted beds, conifers and shrubs, a table and chairs set in the middle of a flower bed. Outdoors the park holds about 6,000 rose varieties, which explains its name; the greenhouse is not their setting.

The greenhouse is closed: the operator still flags it on its home page on 3 October 2026, with no reopening date. A visit to the park remains possible. At the foot of the great greenhouse rises the Flower Tower, a 45 m viewing tower whose glazed room overlooks the park and, on a clear day, gives a view of Mount Norikura and Mount Ena, according to the park. The peak season is the roses: mid-May to early June in spring, and around late October for the autumn roses, according to the operator. The park lies about 2 km from the Kani-Mitake interchange on the Tōkai-Kanjō Expressway, and, according to Japanese Wikipedia, buses link it with Kani and Shin-Kani stations.