If you want towering sunflowers that become the year’s centerpiece, giant sunflower seeds are a reliable choice. The varieties below are selected for height, large bloom size, and garden adaptability, making them suitable for borders, backyards, and pollinator-friendly plantings. Each option offers non-GMO or heirloom characteristics in many cases, along with guidance for growth, germination, and care to help you plan a thriving sunflower patch.
| Product | Approx. Height | Seeds Count |
|---|---|---|
| HOME GROWN 520+ Giant Mammoth Sunflower Seeds | Up to 12 feet | 520+ seeds |
| Sow Right Seeds Mammoth Sunflower Seeds | 8–12 feet | ~70 seeds per packet |
| Skyscraper Sunflower Seeds (CZ Grain) | 15–20 feet | 100+ seeds |
| TKE Farms & Gardens Mammoth Sunflower Seeds | Up to 12 feet | 100+ seeds |
| Seedboy Organic Giant Mammoth Grey Sunflower Seeds | 9–12 feet | 75 seeds |
Note: Availability and exact germination rates can vary by growing conditions. Consider your climate, soil, and sun exposure when planning a sunflower patch to maximize height, bloom size, and overall health of the plants.
HOME GROWN 520+ Giant Mammoth Sunflower Seeds
GROW GIANT MAMMOTH SUNFLOWERS UP TO 12 FEET TALL. These mammoth sunflower seeds are known for producing impressively tall plants with huge, golden-yellow blooms and dark centers. Reaching heights of up to 12 feet with flower heads as wide as 14 inches, they make a striking visual statement in any garden. Ideal for borders, backyards, or along fences, these sunflowers attract attention while offering natural beauty and pollinator support.
520 PREMIUM HEIRLOOM SEEDS FOR HIGH-VOLUME PLANTING. This mega pack includes approximately 520 non-GMO, heirloom seeds, giving you the freedom to grow a large sunflower patch or multiple seasonal plantings. Whether you’re cultivating for ornamental use, seed harvest, or wildlife feeding, the generous seed count ensures abundant growth. Each seed is open-pollinated and packaged for freshness, ideal for both home gardeners and large-scale hobby growers.
EASY TO GROW IN VARIOUS CLIMATES AND SOILS. Mammoth sunflowers are beginner-friendly and adaptable to a range of soil types and weather conditions. Simply plant in full sun and water regularly—no complicated maintenance required. Their hardy nature allows them to flourish in garden beds, field rows, or decorative planters. Perfect for school gardens, family projects, or anyone looking to enjoy a rewarding and low-effort growing experience.
Sow Right Seeds Mammoth Sunflower Seeds
Beautiful – Mammoth Sunflower (Helianthus var. ‘Mammoth’) seeds grow tall, with heights of 8-12 ft. The seeds are open-pollinated and can be saved to plant year after year. Each packet provides 8 g (approximately 70-80 seeds). Harvest and roast your own sunflower seeds for snacks or crafts.
Productive – Germination typically occurs in 7-14 days when soil temps are 70-75°F. Plant 1 inch deep and space 3 feet apart in full sun. Expect 8-12 feet tall plants with a 2-3 foot spread. Flowers mature in 80-90 days, suitable for USDA zones 3-9.
Pollinator and Bird Friendly – Bees love the nectar in sunflowers and visit throughout the season. Birds enjoy dried seeds later, providing a natural wildlife cycle in your garden.
Skyscraper Sunflower Seeds
FRESH SEEDS: 100+ seeds that promise the biggest sunflowers in your patch. BIGGEST SUNFLOWERS: Heights of 15-20 feet tall with giant 18-inch blooms making a dramatic focal point in any landscape.
GOOD FOR ENVIRONMENT: Supports pollinators, helping bees and butterflies while adding striking vertical interest to garden spaces. The tall stalks create living screens or dramatic border accents.
Chocolate Cherry Sunflower Seeds
EXOTIC CHOCOLATE CHERRY SUNFLOWER SEEDS – Large 5–8″ burgundy-black blooms with chocolate centers on 6–7 ft branching heirloom plants, offering a striking color contrast in any bed or container.
POLLINATOR FRIENDLY GARDEN SEEDS – Attracts bees, butterflies, birds, and other pollinators, balancing habitat support with ornamental use. An annual sunflower suitable for beds, borders, and cut flowers.
Axel’s Garden Seeds Mammoth Sunflower
Sunflower Seeds for Planting – This packet includes 50 Mammoth Grey Stripe sunflower seeds. Mammoth grey stripe sunflowers reach 9-12 feet tall with vivid yellow petals and a bold display.
Non-GMO Heirloom Seeds – All Axel’s Garden Seeds are heirloom and non-GMO, with fresh seeds intended for the current and following growing seasons. Each packet includes clear growing instructions to maximize success.
Planting Packets with Instructions – Design-forward packets include a color illustration and step-by-step growing guidance, helping gardeners of all levels achieve strong results.
TKE Farms & Gardens Mammoth Sunflower Seeds
WHY CHOOSE OUR MAMMOTH SUNFLOWER SEEDS? Add towering beauty to your garden with premium Mammoth Sunflower Seeds. These heirloom seeds produce giant yellow blooms, perfect for garden borders, privacy screens, and attracting beneficial pollinators.
HIGH GERMINATION RATE: Carefully selected seeds aim for a strong start with robust, towering sunflowers up to 12 feet tall that brighten landscapes and delight pollinators.
EASY TO GROW – INSTRUCTIONS INCLUDED: Detailed, beginner-friendly instructions help gardeners at any level cultivate healthy plants with minimal effort.
Seedboy Organic Giant Mammoth Grey Sunflower Seeds
Non-GMO & Organic Certified Seeds – Giant Mammoth Grey Stripe sunflowers that are USDA certified organic by OTCO and non-GMO. Grown in the USA, these seeds emphasize natural, healthy growth.
Our Germination Promise – If seeds don’t germinate, the provider offers a replacement, prioritizing gardening success.
Generous Seed Count – Each packet contains 75 premium seeds, suitable for greenhouse or outdoor planting in sunny locations, containers, or rows.
Buying Guide: Key Purchase Considerations And Comparisons
- Height potential and bloom size — If you want dramatic vertical elements, prioritize varieties labeled to reach 12–20 feet with large flower heads (15–18 inches). For a more compact display, 8–12 feet is still impressive but easier to manage in smaller spaces.
- Seed type and heritage — Heirloom and open-pollinated seeds can be saved for subsequent seasons, while non-GMO assurances appeal to organic gardeners. Consider seed counts per packet to plan patches and replacements.
- Germination and growth requirements — Most Mammoth sunflowers need full sun and regular watering. Check stated germination windows (e.g., 7–14 days) and recommended planting depths to optimize emergence and early growth.
- Pollinator appeal — Sunflowers support pollinators; if this is a goal, select varieties noted for attracting bees, butterflies, or birds with seeds available later in the season.
- Climate compatibility — Varieties with USDA zone guidance (e.g., zones 3–9) indicate broader adaptability. Consider your last-frost date and growing season length to time sowing.
- Maintenance and care — Some seeds include detailed growing instructions and easy-start guidance, which can reduce initial gardening barriers for beginners.
- Esthetic goals and landscape use — Tall, towering plants are ideal as backdrops or privacy screens, while multi-headed or heavily branched plants can act as striking focal points in borders or containers.
- Seed handling and replacement policies — Look for sellers offering germination guarantees or replacements if germination falls short, adding reliability to your planting project.
Giant sunflowers bring bold vertical interest and pollinator benefits to American gardens. By choosing seeds with strong germination, clear growing instructions, and heritage or organic options, you can tailor a patch that fits your space, climate, and garden goals.