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Two of my ferns are Ontario Natives and both are pretty well at their peak right now.
Adiantum pedatum (Maidenhair Fern)
Adiantum pedatum
Matteuccia struthiopteris (Ostrich Fern)
Both are easy to grow and really brighten up a shady area of the garden with their bright green colour. The Adiantum pedatum especially provides fantastic texture and movement as well.