Flowers
Beginner
Annual
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Mammoth Sunflower
Helianthus annuus
About Plant: Mammoth Sunflower
A towering sunflower grown for enormous flower heads, dramatic height and mature edible seeds.
Growing Profile
SunlightFull Sun
WaterModerate
SoilAverage, well-drained (6.0–7.5)
Spacing12–24 inches
Height8–12 feet
Time to Harvest60-90
Planting Depth1/4–1/2 inch
Germination Time3–10 days
Expert Growing Tips
Deadhead for more flowers unless saving seed, and leave some open blooms available to pollinators.