Skyscraper is a very tall Helianthus annuus with stalks to 12 feet and bright yellow heads 10-12 inches across. Sow 1/2-1 inch deep outdoors after the last frost when soil is over 70ºF.
We space branching plants 18-24 inches apart in loose, rich, well-drained soil in full sun. Seed sprouts in 7-14 days, blooms in 65-75 days, and faded heads give edible seeds for people and birds.
