Giant Sunflower
Helianthus annuus 'Mammoth Russian'
A classic giant sunflower reaching 8 feet or more with enormous golden-yellow flower heads up to 12 inches across. A bold statement plant that attracts pollinators and birds.
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Growing Giant Sunflower
Plant it in full sun. It prefers moderate water. It is hardy in USDA zones 2–11. Expect it to reach about 8.2 ft tall and 2 ft wide at maturity, in roughly 1 year.
When to plant Giant Sunflower
Wait until all danger of frost has passed, then plant out Giant Sunflower into warm soil; in most zones that means late spring. Planted then, it flowers from July to September.
Month-by-month timing for your zone is on the planting calendar: for the middle of its range, start with zone 6 in April.
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