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How to Manage Pests

Identification: Weed Photo Gallery

Sunflowers

Scientific name: Helianthus spp. (Family Asteraceae)

Life stages of Sunflowers left picture right picture

Click on image to enlarge

DESCRIPTION:
Sunflowers are large, rough, hairy broadleaf plants with large yellow compound flowers. They may be summer annuals or perennials and have single or branched stems, depending on species. Seedling seed leaves are bright green and two to three times as long as wide. Stems of mature plants are thick and covered with coarse hair. The spade-shaped leaves range from several inches (8 ¬‚ 15 cm) to nearly a foot (30 cm) across. Flowers are composites with a dark center surrounded by a halo of yellow to orange petals. When mature, the center disk of the flower head holds scores of seeds that are very attractive to birds.

Broadleaf ID illustration.


Statewide IPM Program, Agriculture and Natural Resources, University of California
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For noncommercial purposes only, any Web site may link directly to this page. FOR ALL OTHER USES or more information, read Legal Notices. Unfortunately, we cannot provide individual solutions to specific pest problems. See How to manage pests, or in the U.S., contact your local Cooperative Extension office for assistance. /PMG/WEEDS/sunflowers.html revised: March 11, 2008. Contact webmaster.