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en.wikipedia.org/wiki/Helianthus_annuus

Helianthus annuus, the common sunflower, is a large annual forb of the genus Helianthus grown as a crop for its edible oil and edible fruits. This sunflower species is also used as wild bird food, as livestock forage (as a meal or a silage plant), in some industrial applications, and as an ornamental in domestic gardens. The plant was first domesticated in the Americas.

www.gardenia.net/plant/helianthus-annuus-evening-sun

Particularly eye-catching, Helianthus annuus 'Evening Sun' (Common Sunflower) is a fast-growing, well-branched annual with oblong to lanceolate leaves and flowers that are reminiscent of a brilliant sunset. From summer to fall, it produces a profusion of large blossoms, up to 8-10 in. across (20-25 cm), adorned with warm copper to mahogany petals and a dark chocolate central disc.

www.smmtc.org/plantofthemonth/Common_Sunflower.php

Common Sunflower blooms from February to October, nearly all year. It is similar in appearance to Slender Sunflower, but larger and more stout. The large radiant flowers punctuate the tops of long erect stems, with yellow ray flowers and brownish purple disk flowers, overall varying from 2 to 6 inches in diameter.

ffnaturesearch.org/common-sunflower

COMMON SUNFLOWER Helianthus annuus SUNFLOWER FAMILY (Asteraceae) Description This native annual has an erect, stout stem from 2 to more than 10 feet tall. Rough, coarsely hairy, heart-shaped leaves up to 16 inches long and 8 inches wide are usually alternate, although they may be opposite at the base of the stem (B).

www.invasive.org/browse/subinfo.cfm?sub=5688

Appearance Helianthus annuus is a coarse, hairy, leafy, fast growing annual that grows from 5-10 ft (1.5-3 m) tall on stiff upright stalks. It is native to dry plains, prairies, meadows and foothills in the western U. S., Canada and northern Mexico. Foliage

uswildflowers.com/detail.php?SName=Helianthus annuus

Helianthus annuus - Common Sunflower, Kansas Sunflower, Mirasol. Officially classified as a Secondary Noxious Weed in Iowa, Helianthus annuus can be quite weedy in other parts of its range as well, but has an attractive flower. It is found in dry open areas and disturbed sites in every state, is native from Minnesota to Texas and westward, and is introduced to the rest of the United States ...

thenatureniche.com/2012/09/01/common-sunflower

Common sunflower is an aggressive, invasive plant. Along roadsides or fence rows it is a pretty wildflower. However, when sunflowers invade fields, pastures or agricultural crops they become noxious weeds. As an annual, the plants die each year. Particularly in our arid environment, the stems and seed heads will persist for several years as ...

www.botanical.com/botanical/mgmh/s/sunfl100.html

The common Sunflower is a native of Mexico and Peru, introduced into this country in the sixteenth century and now one of our most familiar garden plants. It is an annual herb, with a rough, hairy stem, 3 to 12 feet high, broad, coarselytoothed, rough leaves, 3 to 12 inches long, and circular heads of flowers, 3 to 6 inches wide in wild ...

www.missouribotanicalgarden.org/PlantFinder/PlantFinderDetails.aspx?kempercode=a583

Common Name: common sunflower . Type: Annual Family: Asteraceae Native Range: United States and Central America Zone: 2 to 11 Height: 3.00 to 10.00 feet Spread: 1.50 to 3.00 feet Bloom Time: July to August Bloom Description: Yellow, red, mahogany, bicolor rays with brown to purple center disk ...

www.proflowers.com/blog/sunflower-facts

A common “purple sunflower” is the Chianti Hybrid. A Chianti Hybrid’s petals have deep, dark reds which some classify as purple. This sunflower plant can grow to five feet and has no pollen, making it good for cutting. These sunflowers can help balance color in mixed bouquets. 2. Vincent Van Gogh Wasn’t the Only Sunflower Painter