helianthus angustifolius - GARDENING
GONE WILD: Be sure to notice the bright gold daisy flowers of the narrow-leaf sunflower (Helianthus angustifolius) blooming so beautifully now along roads and interstate highways. Also in bloom are ... The last sunflower to bloom, Helianthus angustifolius (Swamp Sunflower) is a showy perennial forming a clump of tall and sturdy, green to purplish pubescent stems.
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They boast a profusion of brilliant golden-yellow flowers, 2-3 in. across (5-7 cm), from fall to frost. Helianthus angustifolius is a species of sunflower known by the common name narrowleaf sunflower or swamp sunflower. Swamp Sunflower has attractive, dark green foliage throughout the growing season and puts on a show of bright yellow blooms in the fall.
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Unlike other species in its genus, Helianthus angustifolius doesn't spread aggressively, but rather forms a gradually growing clump. Swamp sunflower (Helianthus angustifolius) is an herbaceous perennial native to all regions of Florida. It is cold hardy between USDA Hardiness Zones 8B through 10. In the cooler parts of Florida it may go dormant in the winter, but springs faithfully back to life as soon as temperatures climb. Helianthus (/ ˌhiːliˈænθəs /) [3] is a genus comprising around 70 species of annual and perennial flowering plants in the daisy family Asteraceae commonly known as sunflowers.
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[4][5] Except for three South American species, the species of Helianthus are native to North America and Central America. Sunflowers, including the popular annual (Helianthus annuus) are beloved for their bright summer blooms. While annuals need replanting each year perennial sunflowers offer an attractive option for gardens, providing longer bloom periods from late summer to mid-autumn. Cherished for their beauty, Sunflowers (Helianthus) are striking ornamental annuals or perennial plants grown for their colorful summer and fall blooms. Fast-growing, they can reward you with glamorous blooms between 55 and 100 days after planting.