Mammoth Sunflower Seeds - Heirloom Flower Garden Seeds for Growing

Mammoth Sunflower is a warm-season flowering plant grown for its very tall upright growth habit and large yellow flower heads. This plant is commonly cultivated in flower gardens, open fields, borders, and landscape plantings for seasonal ornamental use. The plant develops a strong central stem with broad green leaves and produces single oversized flower heads under suitable growing conditions. It performs best in warm climates with full sun exposure and well-drained soil. Mammoth Sunflower is widely grown in home gardens and landscape plantings for height-focused garden structure and seasonal floral display.

Features

• Produces very large yellow sunflower blooms
• Extremely tall upright growth habit
• Suitable for open field and garden planting
• Warm-season annual flowering plant
• Suitable for tall border and landscape use
• Performs well in full sun conditions
• Grows well in well-drained soil
• Suitable for seasonal ornamental gardening
• Suitable for home garden cultivation
• Low maintenance flowering plant

Specifications

• Scientific Name: Helianthus annuus
• Common Name (US): Giant Sunflower
• Seed Type / Variety: Ornamental Sunflower Seeds
• Growth Habit: Very tall annual upright flowering plant
• USDA Zones: 2 to 11
• Planting Season: Spring to early summer
• Growing Season: Warm season flowering period
• Sowing Season: Spring after last frost or direct outdoor sowing
• Sowing Months: March to June
• Germination Time and Conditions: 7 to 14 days at 18 to 30°C in well-drained soil
• Sunlight Requirements: Full sun
• Soil Requirements: Well-drained fertile loamy soil
• Watering Needs: Moderate watering
• Mature Plant Size: 300 to 600 cm height, 60 to 90 cm spread
• Plant Spacing: 60 to 90 cm