Very tall American perennial of central and the eastern United States to Canada having edible tuberous roots.
1The whorled sunflower - sometimes called the giant sunflower - grows in open pastures and along roadsides, mostly in Alabama, Georgia and Tennessee.
2He could see the thick stalks of the giant sunflowers, green and hairy.
3Mr Molloy began growing giant pumpkins as a joke, along with giant sunflowers.