Sale
Sold out
Annual flower
Asteraceae
Organic seeds
Sunflower 'Giant Mammoth'
Helianthus annuus
Product code : JAREC-0274
From the very first weeks, it vigorously shoots skyward, forming tall, sturdy stalks that immediately provide structure to flowerbeds, temporary hedges, and sunny vegetable patches. Easy to grow and naturally strong, it generally doesn't require staking, making it a reassuring choice for gardeners who want a spectacular effect without excessive complication. Its large size also allows it to be used as a summer windbreak or as natural support for certain climbing plants, adding a practical dimension to its radiant beauty. We love to watch it follow the light and dominate the space with a simple, almost sun-like elegance.
- Quantity
- About 40 seeds
- Exposure
- Sun
- Life cycle
- Annual
Discover the plant
Common nameSunflower 'Gigantic Mammoth'
FamilyAsteraceae
GenusSunflower
Speciesannual
CultivarGiant Mammoth
TypeAnnual flower
Botanical nameHelianthus annuus
Reproducible seedsYes
Heirloom varietyYes
‘Giant Mammoth’ Sunflower (Helianthus annuus). From the very first weeks, it vigorously shoots skyward, forming tall, robust stalks that immediately provide structure to flowerbeds, temporary hedges, and sunny vegetable gardens. Easy to grow and naturally sturdy, it generally doesn't require staking, making it a reassuring choice for gardeners who desire a spectacular effect without excessive complication. Its large size also allows it to be used as a summer windbreak or as natural support for certain climbing plants, adding a practical dimension to its vibrant beauty.
Recommended sowing period: May to June. The depth to respect is 2 to 3 cm (3/4 to 1 1/8 in). Germination usually takes 7 to 14 days. For germination, keep the potting mix at 18 to 24 °C (64 to 75 °F). Transplant young flowers when their true leaves have developed and their roots hold the root ball. Handle the seedlings delicately and avoid compressing the stem. Under lighting, gradually space out the containers so that the foliage does not overlap. Acclimatization then prepares the plants for sun, wind, and temperature variations.
This ‘Giant Mammoth’ sunflower forms a large head whose mature seeds can be harvested. Let them finish maturing, then dry them properly and hull them before using them in cooking. Design the arrangement taking into account the adult habit and the distance from which the flowers will be observed. Small flower heads benefit from being placed close to a path, while a tall silhouette can serve as a landmark at the back of a bed. Repeat a few plants of the same variety to make the color legible. Maintain access for pruning and avoid crowding clumps just to fill the space immediately.
Sowing guide
It all startswith a seed.
Sowing depth
2 to 3 cm (3/4 to 1 1/8 in)
Germination temperature
18 to 24°C (64 to 75°F)
Germination time
7 to 14 days
Sowing period
May to June
Propagation
Sowing
Growing method
Recommended sowing period: May to June. Sow at a depth of 2 to 3 cm (3/4 to 1 1/8 in). Germination generally takes 7 to 14 days. For germination, maintain the potting mix at 18 to 24 °C (64 to 75 °F). Transplant young flowers when their true leaves have developed and their roots hold the soil ball together. Handle seedlings gently and avoid compressing the stem. Under lights, progressively space out containers so that the foliage does not overlap. Acclimatization then prepares the plants for sun, wind, and temperature variations. Planting out occurs when conditions match their hardiness. Observe the succession of buds, open flowers, and faded parts to choose appropriate interventions. A cut should preserve shoots that will flower next. For tall-stemmed plants, check supports after a windy period. Light pruning helps maintain the plant's shape without stripping it. Adapt end-of-season care to the plant's cycle: annuals and perennials do not require the same winter preparation.
Soil and care
The right care,at the right time.
Care level
Regular during establishment, then adapted to growing conditions
Watering
Moderate
Soil type
Rich and well-drained
Fertilization
Fertilization supports growth and takes into account nutrients already present in the soil or potting mix. Use mature compost or a fertilizer suitable for the crop, following the dosage instructions. Avoid using multiple products, especially in a container where roots occupy a limited volume. Water as needed after application and observe foliage development before re-fertilizing.
Moisture
Keep soil moist during germination, avoid standing water; adjust thereafter to crop needs
Seasonal care
This giant Mammoth sunflower forms a large head whose ripe seeds can be harvested. Let them finish maturing, then dry them properly and hull them before using them in cooking. Transplant young flowers when their true leaves have developed and their roots hold the root ball. Handle seedlings gently and avoid compressing the stem. Under lighting, gradually space out the containers so that the foliage does not overlap. Acclimatization then prepares the plants for sun, wind, and temperature variations. Planting occurs when conditions match their hardiness. Observe the succession of buds, open flowers, and faded parts to choose appropriate interventions. A cut should preserve the shoots that will flower next. For tall-stemmed plants, check supports after a windy period. Light pruning helps maintain the silhouette without stripping it bare. Adapt the end of the season to the plant's cycle: annuals and perennials do not require the same preparation for winter. Choose between prolonging flowering and keeping seeds on some stems. Removing faded flowers is suitable for many annuals, while dried seed pods and inflorescences can have decorative appeal. Keep plants identified when they no longer bear flowers and remove spontaneous seedlings that block a path. From the first weeks, it shoots vigorously towards the sky, forming tall, robust stems that immediately give structure to flowerbeds, temporary hedges, and sunny vegetable gardens.
Container growing
A garden,within reach.
Recommended pot size
A pierced, stable container, wide enough for the plant to spread out, and deep enough for the roots
Choose this exposure: full sun. Reserve this spacing around the plant: 45 to 60 cm (18 to 24 in). A floral container composition should leave room for each plant to grow. Place upright forms where they remain visible and allow trailing stems to occupy the edge when present. Ensure that combined plants share the desired exposure and moisture. After a few weeks, observe areas that are thickening and only remove damaged parts or stems that hinder the composition's balance. From the first few weeks, it shoots up vigorously towards the sky, forming tall, robust stems that immediately give structure to flowerbeds, temporary hedges, and sunny vegetable gardens. Easy to grow and naturally sturdy, it generally doesn't require staking, making it a reassuring choice for gardeners who want a spectacular effect without excessive complication. Its large size also allows it to be used as a summer windbreak or as natural support for certain climbing plants, adding a practical dimension to its radiant beauty. We love to see it follow the light and dominate the space with a simple, almost solar elegance.
Bloom and dimensions
Its place,in your garden.
Mature height
2.5 to 3.5 m (8 to 11.5 ft)
Width / spread
45 to 60 cm (18 to 24 in)
Foliage type
Seasonal foliage
Growth habit
Climbing
Bloom period
July to September
Fruiting
Choose between prolonging blooming and keeping seeds on some stems. Removing faded flowers is suitable for many annuals, while dried capsules and inflorescences can have decorative appeal. Keep plants identified when they are no longer flowering and remove volunteer seedlings that are blocking a path. Observe the succession of buds, open flowers, and faded parts to choose appropriate interventions.
Harvest
70 to 90 days after sowing
Garden associations
In goodcompany.
Companion plants
In a diversified plantation, you can reserve neighboring sections for these plants: pole beans, cucumbers, corn. The association here serves to organize space and harvests. Respect the height, light, and water needs of each plant, without crowding the foliage. Maintain an aisle for watering and harvesting, then remove finished crops to free up space. This organization facilitates maintenance without promising protection against pests. Design the composition taking into account the mature habit and the distance from which the flowers will be observed.
Recipe idea
From the gardento your plate.
Edible parts
Hulled mature seeds
Recipe idea with 'Mammoth Giant' Sunflower: roasted sunflower seeds for four servings. Prepare 100g of ripe, well-dried, shelled seeds. Discard any damp or damaged seeds and remove any shell fragments. Spread the kernels on a baking sheet and bake at 160°C (320°F) for ten to fifteen minutes. Stir halfway through cooking and watch the color, as small seeds burn quickly. Let cool, then sprinkle over a salad, soup, or roasted vegetables. Salt lightly if desired. Prepare ingredients with clean utensils and adjust cutting to the size of your harvest. This recipe highlights freshly picked parts: remove any damaged pieces before preparation. If doubling quantities, leave enough space in the dish to mix or cook evenly. Quickly refrigerate leftovers in a sealed container and consume within two days. For a meal for two people, simply divide all quantities by two.
Frequently asked questions
Your questions,answered.
How to successfully sow 'Mammoth Giant' Sunflower?
Recommended sowing period: May to June. The depth to respect is 2 to 3 cm (3/4 to 1 1/8 in). Germination generally takes 7 to 14 days. For germination, keep the potting soil at 18 to 24 °C (64 to 75 °F). Transplant young flowers when their true leaves have developed and their roots hold the root ball. Handle seedlings gently and avoid compressing the stem. Under lighting, gradually space out the containers so that the foliage does not overlap. Acclimatization then prepares the plants for sun, wind, and temperature variations.
Can 'Mammoth Grey Stripe' sunflowers be grown in pots?
Choose this exposure: full sun. Reserve this spacing around the plant: 45 to 60 cm (18 to 24 in). A floral container composition must allow space for each plant's growth. Place upright forms where they remain visible and let trailing stems occupy the edge when present. Ensure that combined plants share the desired exposure and moisture. After a few weeks, observe areas that are becoming denser and only remove damaged parts or stems that hinder the composition's balance. From the first weeks, it vigorously shoots skyward, forming tall, robust stems that immediately give structure to flowerbeds, temporary hedges, and sunny vegetable gardens.
When to harvest ‘Giant Mammoth’ Sunflower?
Choose between extending flowering and keeping seeds on some stems. Removing spent flowers is suitable for many annuals, while seed pods and dried inflorescences can have decorative appeal. Keep plants identified when they are no longer in flower and remove spontaneous seedlings that are blocking a path. Observe the succession of buds, open flowers, and faded parts to choose the most useful interventions. Pruning should preserve the shoots that will flower next. For tall-stemmed plants, check supports after a windy spell. Light cleaning helps maintain the plant's shape without stripping it bare.
How to enjoy Giant Mammoth Sunflower in the garden?
This giant Mammoth sunflower forms a large head whose ripe seeds can be harvested. Let them finish maturing, then dry them properly and hull them before using them in cooking. From the first few weeks, it vigorously shoots skywards, forming tall, sturdy stems that immediately add structure to flower beds, temporary hedges, and sunny vegetable patches. Easy to grow and naturally robust, it generally doesn't require staking, making it a reassuring choice for gardeners who want a spectacular effect without excessive complication. Its large size also allows it to be used as a summer windbreak or as a natural support for certain climbing plants, adding a practical dimension to its striking beauty.
How to organize a 'Giant Mammoth' Sunflower planting?
Design the composition, taking into account the adult size of the plants and the distance from which the flowers will be observed. Small blossoms benefit from being closer to a path, while a tall silhouette can serve as a landmark at the back of a bed. Repeat a few plants of the same variety to make the color more legible. Maintain access for cutting and avoid planting clumps too closely just to fill the space immediately. Observe the succession of buds, open flowers, and faded parts to determine necessary interventions. A cut should preserve the shoots that will flower next. For tall-stemmed plants, check their supports after a windy period.
Wildlife and pets
Life,around your plants.
Supporting wildlife
Flowers can host pollinating insects during the season. Plant several in a sunny area accessible to visitors, and avoid treating open flowers. Leave some of the flowers in the garden if you also cut stems for bouquets.
For a great start to your seeds
The right extras.Right here.
Seed Starting Soil
Shop the collectionSeed starting supplies
Shop the collection
