Helianthus giganteus grow and care – herbaceous of the genus Helianthus also known as Giant sunflower or Tall sunflower, Helianthus giganteus perennial but in cold climate grows as annual, as perennial grow evergreen in cold area become deciduous plant also used as ornamental plant and attract pollinators, grow in tropic, mediterranean, subtropical, desert or temperate climate and growing in hardiness zone 4+.
Leaves green in rhomboid shape with serrated margins.
