Adiantum raddianum, commonly called Delta maidenhair fern, and its cultivars are perhaps the most commonly grown of the non-winter hardy maidenhair ferns. Triangular, 3- or 4-pinnate fronds with dark stalks emerge from a dense rootstock of short, branching rhizomes. Fan-shaped pinnae (leaflets) emerge light green but darken with age. Fronds typically grow to 12” wide and 18” long.