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Mammoth sunflower is a tall, warm-season annual plant grown for its large flowering heads and strong upright growth. It develops a single sturdy stem with broad leaves and produces oversized blooms during the growing season. This variety thrives in warm climates with full sunlight and is well suited to garden beds, borders, and open fields. Mammoth sunflower establishes quickly and grows to an impressive height under suitable conditions.
Features
- Tall, upright growth with a single sturdy stem
- Adapted to warm-season cultivation
- Produces large, prominent flower heads
- Suitable for garden beds, borders, and field planting
- Requires full sunlight and open growing space
Specifications
- Scientific Name: Helianthus annuus
- Common Name (US): Sunflower
- Seed Type / Variety: Giant sunflower variety
- Growth Habit: Upright annual
- USDA Zones: 2–11
- Planting Season: Spring to early summer
- Growing Season: Summer
- Sowing Season: March–June
- Germination Time and Conditions: 7–14 days in warm soil (18–25°C)
- Sunlight Requirements: Full sun
- Soil Requirements: Well-drained, moderately fertile soil
- Watering Needs: Moderate; drought-tolerant once established
- Mature Plant Size: 250–400 cm height, 45–75 cm spread
- Plant Spacing: 45–75 cm
