St. Williams Nursery & Ecology Centre operates over 400 acres of field production and 10 acres of greenhouse space in Southern Ontario making it the largest source-identified native plant nursery in the province. We are unique in the nursery trade in that we are the only major supplier that specializes exclusively in native seed and plants for biodiversity conservation of Ontario native wild-type plant genetics. We can guarantee and can verify the origin of all our source-identified native seed and plants as true Ontario wild-type by seed zone. Imports and cultivars are not appropriate for the ecological landscape and, in fact, threaten Ontario’s natural biodiversity. We carry over 300 native species of trees, shrubs, wildflowers, sedges and grasses in a wide variety of formats. We also carry native source-identified seed mixes that can be customized to your requirements.