Mammoth Sunflower Seeds
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Brighten your garden with the bold beauty of Mammoth Sunflower Seeds—perfect for adding height, color, and joy to any outdoor space. These top-quality seeds offer an impressive germination rate, making them ideal for home gardens, borders, or large containers. Whether you're a gardening newbie or a seasoned grower, these sunflowers are easy to plant and grow tall with giant golden blooms that follow the sun and attract pollinators like bees and butterflies.
Mammoth Sunflowers are more than just a visual treat—they also produce edible seeds, making them a fun and rewarding crop to grow. Like all our seeds—whether for vegetables, herbs, fruits, or flowers—these are carefully selected for their performance and reliability. Growing your own plants is a simple way to connect with nature, enjoy vibrant blooms or tasty harvests, and create a garden you’ll love all season long. Get ready to grow something spectacular!




- About About
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Features
Life Cycle
Annual
Planting Season
Spring
Growth Habit
Tall, Upright
Flavor Profile
Mild, Nutty
Plant Characteristics
Large Flowers, Tall Stems
Use
Ornamental, Edible Seeds
Growing Conditions
Full Sun, Well-drained
Harvest Advantages
High Yield, Fast Growing
Plant Resistance
Pest Resistant, Heat Tolerant
About Mammoth Sunflower
Helianthus annuus
Seed Names
Giant Sunflower, Helianthus annuus
Seed Type
Hybrid, Open Pollinated
The Mammoth Sunflower is a towering variety known for its large, vibrant yellow blooms that can reach up to 12 inches in diameter. It thrives in sunny environments and produces an abundance of edible seeds, making it ideal for both ornamental use and harvesting. Known for its impressive height, this sunflower is perfect for adding a dramatic touch to gardens and landscapes.
Planting Information
Light Requirement
Full Sun
Planting Depth
1–2 Inches
Sowing Method
Direct Sow
Plant Spacing
18–24 Inches
Days to Maturity
70–90 Days
Soil Preparation
Soak for 24 Hours
Hardiness Zones
4–9
Water Needs
Moderate
Planting Season
Spring
Coverage
Seed Count
Recommended Coverage
100
Up to 50 Sq Ft
500
Up to 250 Sq Ft
1000
Up to 500 Sq Ft
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The flowers were enormous and bright, bringing life to my backyard. The seeds germinated well, and the plants were sturdy even in windy weather. Definitely a repeat buy.
Love that these sunflowers attract bees and butterflies to my garden. The blooms were gorgeous and the seeds easy to handle. They really brightened up the backyard.
These seeds were top-notch. Planted 20, and 18 sprouted beautifully. Very satisfied with the results and the blooms were bigger than expected.
Out of 30 seeds, maybe 4 didn�t sprout. Still, the ones that grew were tall, strong, and produced large flowers. Overall, a solid buy.
These seeds are massive compared to what I usually buy. Planting them was easy, and they sprouted quickly. Even my kids were impressed with how tall the sunflowers grew. Definitely worth it for a family garden project.