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.
Bloom time
Jul–Sep
Hardiness
Zones 2–11
Sun
Full sun
Water
Moderate water
Mature size
2.5 m × 0.6 m
Type
Annual
Bloom calendar
When Giant Sunflower is typically in flower across the year.
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 2.5 m tall and 0.6 m wide at maturity, in roughly 1 year.
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Design a garden with this
Drop this plant onto a 3D plan, see how it fills in, and watch your whole garden bloom across the year.