It is not hard to see why this genus has the common name sunflower: it not only accurately describes the shape of the blooms but also refers to the way the flowerhead turns to follow the sun during the day. This genus contains about 70 annuals and perennials, mostly from the Americas, and is probably best known for the common or giant sunflower, Helianthus annuus, which is widely grown as a garden plant as well as commercially for its seeds and the oil extracted from them. This spectacular species is also the state flower of Kansas. Plants are usually tall, with hairy and often sticky leaves, and tall bristly stems. The flowerheads grow above the foliage and are large, daisylike, and nearly always yellow.
CULTIVATION
Plant sunflowers in a sunny open position that has fertile, moist, and well-drained soil. Propagate the annuals from seed and the perennials either by division or from cuttings taken from the base of the plant.
Top Tip
Allergy sufferes will appreciate the pollenless sun-flower cultivars that are now available, while birds will enjoy the nutritious seed heads that develop in the central disc.
CULTIVATION
Plant sunflowers in a sunny open position that has fertile, moist, and well-drained soil. Propagate the annuals from seed and the perennials either by division or from cuttings taken from the base of the plant.
Top Tip
Allergy sufferes will appreciate the pollenless sun-flower cultivars that are now available, while birds will enjoy the nutritious seed heads that develop in the central disc.
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