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Upper Rooftop

This extensive greenroof covers 19300 sq.ft, successfully managing storm water on-site.

Upper Rooftop Upper Rooftop

Irrigation System

An irrigation system ensures the survival of the plants—using rainwater collected in cisterns during peak rainfalls.

Irrigation System Irrigation System

Northeast Greenroof

View of greenroof in third year, overlooking Fourth Street.

Northeast Greenroof Northeast Greenroof

Allium schoenoprasum

This drought-tolerant, native flower is one of 41 species, planted across the three greenroofs. Additionally, 18 sedum species are used.

Allium schoenoprasum Allium schoenoprasum

View to Downtown

Surrounding buildings create a stunning background when viewing the roof from inside the library.

View to Downtown View to Downtown

Southwest Greenroof

Careful species selection of varying heights and bloom times emulate a wave pattern.

Southwest Greenroof Southwest Greenroof

Color & Texture

Aster ericoides (Heath Aster) and Schizachyrium scoparium (Little Bluestem) are highlighted here.

Color & Texture Color & Texture

Cuttings

An erosion blanket keeps growing medium in place while newly planted cuttings of sedums become established.

Cuttings Cuttings

Plugs

A variety of plugs await planting. The greenroof has 18 species of sedums and 41 species of various forbs and flowers.

Plugs Plugs

View to Surrounding Buildings

This precious green space can also be visually enjoyed from the surrounding buildings.

View to Surrounding Buildings View to Surrounding Buildings
Minneapolis Public Library green roof

A highly visible project in the heart of downtown Minneapolis, the New Central Library features an 18,500-square foot “extensive” green roof. This roof brings valuable permeable surfacing to help mitigate stormwater in this critical watershed along the Mississippi River. The Library’s green roof consists of 3 separate areas on two levels and is designed with landscaping that is cold-weather hardy, drought tolerant, light in weight and low-maintenance. The growing medium is an average depth of 5” planted with low-growing succulent plants that thrive in Minnesota’s harsh climate. The project also features a rainwater harvesting system for plant irrigation including two 7,500 gallon cisterns and an automated drip irrigation system installed mid-depth in the green roof growing medium.