Approximately four acres make up the 17 themed gardens of the Toronto Botanical Garden. The newest, and largest, addition is the Woodland Walk made up of native trees, shrubs, perennials, and a wildflower meadow, representing the
Carolinian forest and prairie savannah native to this region of Toronto. Next is the Entry Garden Walk, sponsored by the Garden Club of Toronto and designed by Dutch garden designer
Piet Oudolf. This garden is made up of perennials & ornamental grasses which have self-sown to create the sophisticated meadow that greets visitors. A water curtain and water channel are two key features complementing the Arrival Courtyard and West View Terrace, respectively. The building has two
green roofs, one flat space planted with native perennials, the other slanted and planted with sedum varieties. Part of the TBG's
Silver LEED Certification includes the collection of rainwater from the water features as well as the building, which is stored in two cisterns found in the perennial borders. Garden staff work from a straw bale shed also with a green roof of native perennials. ==Children's education==