The fruit resembles a bird’s head with a round base and a long ‘beak’. Seeds are often produced late in the season. Butterflies, bees and hummingbirds will visit the flowers.Įach fruit releases a number of reticulate seeds. The species typically has brilliant orange flowers, but there are cultivars in pastels and white as well. Plants bloom from mid-summer to frost, often with the best display in late summer. Pollinated flowers develop a fruit (LC) enclosed in the green bracts (L), which ripens and dries (RC) to a tan color. Showy flowers (RC, from side and R from front) emerge (LC) from hairy bracts (L). The trumpet-shaped corolla opens flat with five overlapping petals surrounding the brownish-maroon center. Each 1½ inch wide flower emerges from a small yellow-green calyx enclosed in 2 large, ridged, hairy, green bracts. Showy flowers in shades of orange and yellow are produced singly in the leaf axils. They are soft and hairy, dull dark green on the upper surface and pale green with prominent veins below, with slightly toothed margins. The opposite, oval to triangular or heart-shaped leaves grow up to 3 inches long on winged petioles. The plant is a rambler, climbing by twining (growing in a spiral up a support) rather than by clinging or producing tendrils as some other vines do. BLACK EYED SUSAN VINE FREEMidwest (and much more in frost free climates). This vine grows by twisting around supports (L) and has heart-shaped, softly hairy leaves (R). This trailing or twining vine grows rapidly from seeds, reaching up to 8 feet in a single season under ideal conditions, but more often only 3 to 5 feet in the It should be used with caution in frost-free areas as it has become invasive in many warm locations throughout the world. Because it grows and flowers relatively quickly it is often used as an annual ornamental garden plant in cooler areas. This plant, Thunbergia alata, is actually a tender evergreen perennial in the acanthus family (Acanthaceae) native from tropical East Africa to eastern South Africa that is hardy only in zone 9 and 10 (and is completely unrelated to Rudbeckia hirta, an herbaceous annual or short-lived perennial in the daisy family (Compositae) native to north America, also commonly called black-eyed Susan). Thunbergia alata is a fast-growing, free-flowering vine.īlack-eyed Susan vine is commonly grown in the Midwest as a season annual to provide color in a vertical setting.
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