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Mammoth Sunflower (Helianthus annuus 'Mammoth') is a tall variety known for its large, 12-inch flower heads with brown centers and yellow petals. It grows over 8 feet high and is valued for both its ornamental beauty and abundant seeds, which attract wildlife and can be harvested for human consumption.
Key Features
Height: Grows 9 to 12 feet tall, sometimes up to 14 feet.
Flower Heads: Large blooms over 12 inches in diameter with vibrant yellow petals.
Leaves: Large, heart-shaped, and rough-textured.
Growing Requirements
Sunlight: Requires full sun (6-8 hours daily).
Soil: Prefers well-draining, fertile soil (pH 6.0-7.5). Enhance with compost or aged manure.
Watering: Regular watering, deep watering for strong roots.
Spacing: Space plants 2 to 3 feet apart.
Planting Instructions
Sowing: Direct sow after the last frost when soil is 55-60°F (13-16°C). Plant seeds 1 inch deep.
Germination: 7 to 10 days.
Support: May need staking to prevent toppling.
Fertilization: Use balanced or high-phosphorus fertilizer.
Benefits
Aesthetic Appeal: Attracts pollinators like bees and butterflies.
Edible Seeds: Harvest for roasting, culinary use, or bird feed.
Wildlife Support: Provides food for birds and small mammals.
Cut Flowers: Ideal for floral arrangements.
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